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# kitty.conf

kitty is highly customizable, everything from keyboard shortcuts, to rendering frames-per-second. See below for an overview of all customization possibilities.

You can open the config file within kitty by pressing `ctrl+shift+f2` (`⌘`+`,` on macOS). A `kitty.conf` with commented default configurations and descriptions will be created if the file does not exist. You can reload the config file within kitty by pressing `ctrl+shift+f5` (`⌃`+`⌘`+`,` on macOS) or sending kitty the `SIGUSR1` signal with `kill -SIGUSR1 $KITTY_PID`. You can also display the current configuration by pressing `ctrl+shift+f6` (`⌥`+`⌘`+`,` on macOS).

kitty looks for a config file in the OS config directories (usually `~/.config/kitty/kitty.conf`) but you can pass a specific path via the `kitty --config` option or use the `KITTY_CONFIG_DIRECTORY` environment variable. See `kitty --config` for full details.

Comments can be added to the config file as lines starting with the `#` character. This works only if the `#` character is the first character in the line.

Lines can be split by starting the next line with the `\` character. All leading whitespace and the `\` character are removed.

You can include secondary config files via the `include` directive. If you use a relative path for `include`, it is resolved with respect to the location of the current config file. Note that environment variables are expanded, so `${USER}.conf` becomes `name.conf` if `USER=name`. A special environment variable `KITTY_OS` is available, to detect the operating system. It is `linux`, `macos` or `bsd`. Also, you can use `globinclude` to include files matching a shell glob pattern and `envinclude` to include configuration from environment variables. Finally, you can dynamically generate configuration by running a program using `geninclude`. For example:

    # Include other.conf
    include other.conf
    # Include *.conf files from all subdirs of kitty.d inside the kitty config dir
    globinclude kitty.d/**/*.conf
    # Include the *contents* of all env vars starting with KITTY_CONF_
    envinclude KITTY_CONF_*
    # Run the script dynamic.py placed in the same directory as this config file
    # and include its :file:`STDOUT`. Note that Python scripts are fastest
    # as they use the embedded Python interpreter, but any executable script
    # or program is supported, in any language. Remember to mark the script
    # file executable.
    geninclude dynamic.py

## Fonts

kitty has very powerful font management. You can configure individual font faces and even specify special fonts for particular characters.

font_family, bold_font, italic_font, bold_italic_font

    font_family      monospace
    bold_font        auto
    italic_font      auto
    bold_italic_font auto

You can specify different fonts for the bold/italic/bold-italic variants. The easiest way to select fonts is to run the `kitten choose-fonts` command which will present a nice UI for you to select the fonts you want with previews and support for selecting variable fonts and font features. If you want to learn to select fonts manually, read the font specification syntax.

font_size

    font_size 11.0

Font size (in pts).

force_ltr

    force_ltr no

kitty does not support BIDI (bidirectional text), however, for RTL scripts, words are automatically displayed in RTL. That is to say, in an RTL script, the words “HELLO WORLD” display in kitty as “WORLD HELLO”, and if you try to select a substring of an RTL-shaped string, you will get the character that would be there had the string been LTR. For example, assuming the Hebrew word ירושלים, selecting the character that on the screen appears to be ם actually writes into the selection buffer the character י. kitty’s default behavior is useful in conjunction with a filter to reverse the word order, however, if you wish to manipulate RTL glyphs, it can be very challenging to work with, so this option is provided to turn it off. Furthermore, this option can be used with the command line program GNU FriBidi to get BIDI support, because it will force kitty to always treat the text as LTR, which FriBidi expects for terminals.

symbol_map

Has no default values. Example values are shown below:

    symbol_map U+E0A0-U+E0A3,U+E0C0-U+E0C7 PowerlineSymbols

Map the specified Unicode codepoints to a particular font. Useful if you need special rendering for some symbols, such as for Powerline. Avoids the need for patched fonts. Each Unicode code point is specified in the form `U+<code point in hexadecimal>`. You can specify multiple code points, separated by commas and ranges separated by hyphens. This option can be specified multiple times. The syntax is:

    symbol_map codepoints Font Family Name

narrow_symbols

Has no default values. Example values are shown below:

    narrow_symbols U+E0A0-U+E0A3,U+E0C0-U+E0C7 1

Usually, for Private Use Unicode characters and some symbol/dingbat characters, if the character is followed by one or more spaces, kitty will use those extra cells to render the character larger, if the character in the font has a wide aspect ratio. Using this option you can force kitty to restrict the specified code points to render in the specified number of cells (defaulting to one cell). This option can be specified multiple times. The syntax is:

    narrow_symbols codepoints [optionally the number of cells]

disable_ligatures

    disable_ligatures never

Choose how you want to handle multi-character ligatures. The default is to always render them. You can tell kitty to not render them when the cursor is over them by using `cursor` to make editing easier, or have kitty never render them at all by using `always`, if you don’t like them. The ligature strategy can be set per-window either using the kitty remote control facility or by defining shortcuts for it in `kitty.conf`, for example:

    map alt+1 disable_ligatures_in active always
    map alt+2 disable_ligatures_in all never
    map alt+3 disable_ligatures_in tab cursor

Note that this refers to programming ligatures, typically implemented using the `calt` OpenType feature. For disabling general ligatures, use the `font_features` option.

font_features

Has no default values. Example values are shown below:

    font_features none

Choose exactly which OpenType features to enable or disable. Note that for the main fonts, features can be specified when selecting the font using the choose-fonts kitten. This setting is useful for fallback fonts.

Some fonts might have features worthwhile in a terminal. For example, Fira Code includes a discretionary feature, `zero`, which in that font changes the appearance of the zero (0), to make it more easily distinguishable from Ø. Fira Code also includes other discretionary features known as Stylistic Sets which have the tags `ss01` through `ss20`.

For the exact syntax to use for individual features, see the HarfBuzz documentation.

Note that this code is indexed by PostScript name, and not the font family. This allows you to define very precise feature settings; e.g. you can disable a feature in the italic font but not in the regular font.

On Linux, font features are first read from the FontConfig database and then this option is applied, so they can be configured in a single, central place.

To get the PostScript name for a font, use the `fc-scan file.ttf` command on Linux or the Font Book tool on macOS.

Enable alternate zero and oldstyle numerals:

    font_features FiraCode-Retina +zero +onum

Enable only alternate zero in the bold font:

    font_features FiraCode-Bold +zero

Disable the normal ligatures, but keep the `calt` feature which (in this font) breaks up monotony:

    font_features TT2020StyleB-Regular -liga +calt

In conjunction with `force_ltr`, you may want to disable Arabic shaping entirely, and only look at their isolated forms if they show up in a document. You can do this with e.g.:

    font_features UnifontMedium +isol -medi -fina -init

modify_font

Modify font characteristics such as the position or thickness of the underline and strikethrough. The modifications can have the suffix `px` for pixels or `%` for percentage of original value. No suffix means use pts. For example:

    modify_font underline_position -2
    modify_font underline_thickness 150%
    modify_font strikethrough_thickness 200%
    modify_font strikethrough_position 2px

Additionally, you can modify the size of the cell in which each font glyph is rendered and the baseline at which the glyph is placed in the cell. For example:

    modify_font cell_width 80%
    modify_font cell_height -2px
    modify_font baseline 3

Note that modifying the baseline will automatically adjust the underline and strikethrough positions by the same amount. Increasing the baseline raises glyphs inside the cell and decreasing it lowers them. Decreasing the cell size might cause rendering artifacts, so use with care.

box_drawing_scale

    box_drawing_scale 0.001, 1, 1.5, 2

The sizes of the lines used for the box drawing Unicode characters. These values are in pts. They will be scaled by the monitor DPI to arrive at a pixel value. There must be four values corresponding to thin, normal, thick, and very thick lines.

undercurl_style

    undercurl_style thin-sparse

The style with which undercurls are rendered. This option takes the form `(thin|thick)-(sparse|dense)`. Thin and thick control the thickness of the undercurl. Sparse and dense control how often the curl oscillates. With sparse the curl will peak once per character, with dense twice. Changing this option dynamically via reloading the config or remote control is undefined.

underline_exclusion

    underline_exclusion 1

By default kitty renders gaps in underlines when they overlap with descenders (the parts of letters below the baseline, such as for y, q, p etc.). This option controls the thickness of the gaps. It can be either a unitless number in which case it is a fraction of the underline thickness as specified in the font or it can have a suffix of `px` for pixels or `pt` for points. Set to zero to disable the gaps. Changing this option dynamically via reloading the config or remote control is undefined.

text_composition_strategy

    text_composition_strategy platform

Control how kitty composites text glyphs onto the background color. The default value of `platform` tries for text rendering as close to “native” for the platform kitty is running on as possible.

A value of `legacy` uses the old (pre kitty 0.28) strategy for how glyphs are composited. This will make dark text on light backgrounds look thicker and light text on dark backgrounds thinner. It might also make some text appear like the strokes are uneven.

You can fine tune the actual contrast curve used for glyph composition by specifying up to two space-separated numbers for this setting.

The first number is the gamma adjustment, which controls the thickness of dark text on light backgrounds. Increasing the value will make text appear thicker. The default value for this is `1.0` on Linux and `1.7` on macOS. Valid values are `0.01` and above. The result is scaled based on the luminance difference between the background and the foreground. Dark text on light backgrounds receives the full impact of the curve while light text on dark backgrounds is affected very little.

The second number is an additional multiplicative contrast. It is percentage ranging from `0` to `100`. The default value is `0` on Linux and `30` on macOS.

If you wish to achieve similar looking thickness in light and dark themes, a good way to experiment is start by setting the value to `1.0 0` and use a dark theme. Then adjust the second parameter until it looks good. Then switch to a light theme and adjust the first parameter until the perceived thickness matches the dark theme.

text_fg_override_threshold

    text_fg_override_threshold 0

A setting to prevent low contrast between foreground and background colors. Useful when working with applications that use colors that do not contrast well with your preferred color scheme. The default value is `0`, which means no color overriding is performed. There are two modes of operation:

A value with the suffix `ratio` represents the minimum accepted contrast ratio between the foreground and background color. Possible values range from `0.0 ratio` to `21.0 ratio`. For example, to meet WCAG level AA a value of `4.5 ratio` can be provided. The algorithm is implemented using HSLuv which enables it to change the perceived lightness of a color just as much as needed without really changing its hue and saturation.

A value with the suffix `%` represents the minimum accepted difference in luminance between the foreground and background color, below which kitty will override the foreground color. It is percentage ranging from `0 %` to `100 %`. If the difference in luminance of the foreground and background is below this threshold, the foreground color will be set to white if the background is dark or black if the background is light.

WARNING: Some programs use characters (such as block characters) for graphics display and may expect to be able to set the foreground and background to the same color (or similar colors). If you see unexpected stripes, dots, lines, incorrect color, no color where you expect color, or any kind of graphic display problem try setting `text_fg_override_threshold` to `0` to see if this is the cause of the problem or consider using the `ratio` mode of operation described above instead of the `%` mode of operation.

## Text cursor customization

cursor

    cursor #cccccc

Default text cursor color. If set to the special value `none` the cursor will be rendered with a “reverse video” effect. Its color will be the color of the text in the cell it is over and the text will be rendered with the background color of the cell. Note that if the program running in the terminal sets a cursor color, this takes precedence. Also, the cursor colors are modified if the cell background and foreground colors have very low contrast. Note that some themes set this value, so if you want to override it, place your value after the lines where the theme file is included.

cursor_text_color

    cursor_text_color #111111

The color of text under the cursor. If you want it rendered with the background color of the cell underneath instead, use the special keyword: background. Note that if `cursor` is set to `none` then this option is ignored. Note that some themes set this value, so if you want to override it, place your value after the lines where the theme file is included.

cursor_shape

    cursor_shape block

The cursor shape can be one of `block`, `beam`, `underline`. Note that when reloading the config this will be changed only if the cursor shape has not been set by the program running in the terminal. This sets the default cursor shape, applications running in the terminal can override it. In particular, shell integration in kitty sets the cursor shape to `beam` at shell prompts. You can avoid this by setting `shell_integration` to `no-cursor`.

cursor_shape_unfocused

    cursor_shape_unfocused hollow

Defines the text cursor shape when the OS window is not focused. The unfocused cursor shape can be one of `block`, `beam`, `underline`, `hollow` and `unchanged` (leave the cursor shape as it is).

cursor_beam_thickness

    cursor_beam_thickness 1.5

The thickness of the beam cursor (in pts).

cursor_underline_thickness

    cursor_underline_thickness 2.0

The thickness of the underline cursor (in pts).

cursor_blink_interval

    cursor_blink_interval -1

The interval to blink the cursor (in seconds). Set to zero to disable blinking. Negative values mean use system default. Note that the minimum interval will be limited to `repaint_delay`. You can also animate the cursor blink by specifying an easing function. For example, setting this to option to `0.5 ease-in-out` will cause the cursor blink to be animated over a second, in the first half of the second it will go from opaque to transparent and then back again over the next half. You can specify different easing functions for the two halves, for example: `-1 linear ease-out`. kitty supports all the CSS easing functions. Note that turning on animations uses extra power as it means the screen is redrawn multiple times per blink interval. See also, `cursor_stop_blinking_after`. This setting also controls blinking text, which blinks in exact rhythm with the cursor.

cursor_stop_blinking_after

    cursor_stop_blinking_after 15.0

Stop blinking cursor after the specified number of seconds of keyboard inactivity. Set to zero to never stop blinking. This setting also controls blinking text, which blinks in exact rhythm with the cursor.

cursor_trail

    cursor_trail 0

Set this to a value larger than zero to enable a “cursor trail” animation. This is an animation that shows a “trail” following the movement of the text cursor. It makes it easy to follow large cursor jumps and makes for a cool visual effect of the cursor zooming around the screen. The actual value of this option controls when the animation is triggered. It is a number of milliseconds. The trail animation only follows cursors that have stayed in their position for longer than the specified number of milliseconds. This prevents trails from appearing for cursors that rapidly change their positions during UI updates in complex applications. See `cursor_trail_decay` to control the animation speed and `cursor_trail_start_threshold` to control when a cursor trail is started.

cursor_trail_decay

    cursor_trail_decay 0.1 0.4

Controls the decay times for the cursor trail effect when the `cursor_trail` is enabled. This option accepts two positive float values specifying the fastest and slowest decay times in seconds. The first value corresponds to the fastest decay time (minimum), and the second value corresponds to the slowest decay time (maximum). The second value must be equal to or greater than the first value. Smaller values result in a faster decay of the cursor trail. Adjust these values to control how quickly the cursor trail fades away.

cursor_trail_start_threshold

    cursor_trail_start_threshold 2

Set the distance threshold for starting the cursor trail. This option accepts a positive integer value that represents the minimum number of cells the cursor must move before the trail is started. When the cursor moves less than this threshold, the trail is skipped, reducing unnecessary cursor trail animation.

cursor_trail_color

    cursor_trail_color none

Set the color of the cursor trail when `cursor_trail` is enabled. If set to ‘none’ (the default), the cursor trail will use the cursor’s background color. Otherwise, specify a color value (e.g., #ff0000 for red, or a named color like ‘red’). This allows you to customize the appearance of the cursor trail independently of the cursor color.

## Scrollback

scrollback_lines

    scrollback_lines 2000

Number of lines of history to keep in memory for scrolling back. Memory is allocated on demand. Negative numbers are (effectively) infinite scrollback. Note that using very large scrollback is not recommended as it can slow down performance of the terminal and also use large amounts of RAM. Instead, consider using `scrollback_pager_history_size`. Note that on config reload if this is changed it will only affect newly created windows, not existing ones.

scrollbar

    scrollbar scrolled

Control when the scrollbar is displayed.

`scrolled`

  means when the scrolling backwards has started.

`hovered`

  means when the mouse is hovering on the right edge of the window.

`scrolled-and-hovered`

  means when the mouse is over the scrollbar region and scrolling backwards has started.

`always`

  means whenever any scrollback is present

`never`

  means disable the scrollbar.

scrollbar_interactive

    scrollbar_interactive yes

If disabled, the scrollbar will not be controllable via the mouse and all mouse events will pass through the scrollbar.

scrollbar_jump_on_click

    scrollbar_jump_on_click yes

When enabled clicking in the scrollbar track will cause the scroll position to jump to the clicked location, otherwise the scroll position will only move towards the position by a single screenful, which is how traditional scrollbars behave.

scrollbar_width

    scrollbar_width 0.5

The width of the scroll bar in units of cell width.

scrollbar_hover_width

    scrollbar_hover_width 1

The width of the scroll bar when the mouse is hovering over it, in units of cell width.

scrollbar_handle_opacity

    scrollbar_handle_opacity 0.5

The opacity of the scrollbar handle, 0 being fully transparent and 1 being full opaque.

scrollbar_radius

    scrollbar_radius 0.3

The radius (curvature) of the scrollbar handle in units of cell width. Should be less than `scrollbar_width`.

scrollbar_gap

    scrollbar_gap 0.1

The gap between the scrollbar and the window edge in units of cell width.

scrollbar_min_handle_height

    scrollbar_min_handle_height 1

The minimum height of the scrollbar handle in units of cell height. Prevents the handle from becoming too small when there is a lot of scrollback.

scrollbar_hitbox_expansion

    scrollbar_hitbox_expansion 0.25

The extra area around the handle to allow easier grabbing of the scollbar in units of cell width.

scrollbar_track_opacity

    scrollbar_track_opacity 0

The opacity of the scrollbar track, 0 being fully transparent and 1 being full opaque.

scrollbar_track_hover_opacity

    scrollbar_track_hover_opacity 0.1

The opacity of the scrollbar track when the mouse is over the scrollbar, 0 being fully transparent and 1 being full opaque.

scrollbar_handle_color

    scrollbar_handle_color foreground

The color of the scrollbar handle. A value of `foreground` means to use the current foreground text color, a value of `selection_background` means to use the current selection background color. Also, you can use an arbitrary color, such as `#12af59` or `red`.

scrollbar_track_color

    scrollbar_track_color foreground

The color of the scrollbar track. A value of `foreground` means to use the current foreground text color, a value of `selection_background` means to use the current selection background color. Also, you can use an arbitrary color, such as `#12af59` or `red`.

scrollback_pager

    scrollback_pager less --chop-long-lines --RAW-CONTROL-CHARS +INPUT_LINE_NUMBER

Program with which to view scrollback in a new window. The scrollback buffer is passed as STDIN to this program. If you change it, make sure the program you use can handle ANSI escape sequences for colors and text formatting. INPUT_LINE_NUMBER in the command line above will be replaced by an integer representing which line should be at the top of the screen. Similarly CURSOR_LINE and CURSOR_COLUMN will be replaced by the current cursor position or set to 0 if there is no cursor, for example, when showing the last command output.

If you would rather use neovim to view the scrollback, use something like this:

    scrollback_pager nvim --cmd 'set eventignore=FileType' +'nnoremap q ZQ' +'call nvim_open_term(0, {})' +'set nomodified nolist' +'$' -

The above works for neovim 0.12 and newer. There is also a dedicated plugin kitty-scrollback.nvim you can use with more features that works with older neovim as well.

scrollback_pager_history_size

    scrollback_pager_history_size 0

Separate scrollback history size (in MB), used only for browsing the scrollback buffer with pager. This separate buffer is not available for interactive scrolling but will be piped to the pager program when viewing scrollback buffer in a separate window. The current implementation stores the data in UTF-8, so approximately 10000 lines per megabyte at 100 chars per line, for pure ASCII, unformatted text. A value of zero or less disables this feature. The maximum allowed size is 4GB. Note that on config reload if this is changed it will only affect newly created windows, not existing ones.

scrollback_fill_enlarged_window

    scrollback_fill_enlarged_window no

Fill new space with lines from the scrollback buffer after enlarging a window.

wheel_scroll_multiplier

    wheel_scroll_multiplier 5.0

Multiplier for the number of lines scrolled by the mouse wheel. Note that this is only used for low precision scrolling devices, not for high precision scrolling devices on platforms such as macOS and Wayland. Use negative numbers to change scroll direction. See also `wheel_scroll_min_lines`.

wheel_scroll_min_lines

    wheel_scroll_min_lines 1

The minimum number of lines scrolled by the mouse wheel. The `scroll multiplier` only takes effect after it reaches this number. Note that this is only used for low precision scrolling devices like wheel mice that scroll by very small amounts when using the wheel. With a negative number, the minimum number of lines will always be added.

touch_scroll_multiplier

    touch_scroll_multiplier 1.0

Multiplier for the number of lines scrolled by a touchpad. Note that this is only used for high precision scrolling devices on platforms such as macOS and Wayland. Use negative numbers to change scroll direction.

pixel_scroll

    pixel_scroll yes

Enable per-pixel scrolling, in the kitty scrollback buffer, when using high precision input devices (for example touchpads). When enabled, kitty’s own scrollback will move by sub-line increments instead of only whole lines. This does not affect applications running inside the terminal (for example full-screen TUIs) that handle scrolling themselves.

momentum_scroll

    momentum_scroll 0.96

The amount of friction to apply to slow down momentum (inertial) scrolling. A number from 0 to 1, with 0 meaning no momentum scrolling and 1 meaning infinite scrolling. Note that this setting only applies on platforms such as Wayland, that do not provide native momentum scrolling. On macOS, the native OS based momentum scrolling is used. Also, momentum scrolling only applies to “finger” based devices such as touchpads and touchscreens. Changes to this setting only take effect after a kitty restart.

## Mouse

mouse_hide_wait

    mouse_hide_wait 3.0

Hide mouse cursor after the specified number of seconds of the mouse not being used. Set to zero to disable mouse cursor hiding. Set to a negative value to hide the mouse cursor immediately when typing text. Disabled by default on macOS as getting it to work robustly with the ever-changing sea of bugs that is Cocoa is too much effort.

By default, once the cursor is hidden, it is immediately unhidden on any further mouse events.

Two formats are supported:

  - `<hide-wait>`

  - `<hide-wait> <unhide-wait> <unhide-threshold> <scroll-unhide>`

To change the unhide behavior, the optional parameters `<unhide-wait>`, `<unhide-threshold>`, and `<scroll-unhide>` may be set.

`<unhide-wait>`

  Waits for the specified number of seconds after mouse events before unhiding the mouse cursor. Set to zero to unhide mouse cursor immediately on mouse activity. This is useful to prevent the mouse cursor from unhiding on accidental swipes on the trackpad.

`<unhide-threshold>`

  Sets the threshold of mouse activity required to unhide the mouse cursor, when the <unhide-wait> option is non-zero. When <unhide-wait> is zero, this has no effect.

  For example, if `<unhide-threshold>` is 40 and `<unhide-wait>` is 2.5, when kitty detects a mouse event, it records the number of mouse events in the next 2.5 seconds, and checks if that exceeds 40 * 2.5 = 100. If it does, then the mouse cursor is unhidden, otherwise nothing happens.

`<scroll-unhide>`

  Controls what mouse events may unhide the mouse cursor. If enabled, both scroll and movement events may unhide the cursor. If disabled, only mouse movements can unhide the cursor.

Examples of valid values:

  - `0.0`

  - `1.0`

  - `-1.0`

  - `0.1 3.0 40 yes`

url_color, url_style

    url_color #0087bd
    url_style curly

The color and style for highlighting URLs on mouse-over. `url_style` can be one of: `none`, `straight`, `double`, `curly`, `dotted`, `dashed`.

open_url_with

    open_url_with default

The program to open clicked URLs. The special value `default` will first look for any URL handlers defined via the Scripting the mouse click facility and if non are found, it will use the Operating System’s default URL handler (open on macOS and xdg-open on Linux).

url_prefixes

    url_prefixes file ftp ftps gemini git gopher http https irc ircs kitty mailto news sftp ssh

The set of URL prefixes to look for when detecting a URL under the mouse cursor.

detect_urls

    detect_urls yes

Detect URLs under the mouse. Detected URLs are highlighted with an underline and the mouse cursor becomes a hand over them. Even if this option is disabled, URLs are still clickable. See also the `underline_hyperlinks` option to control how hyperlinks (as opposed to plain text URLs) are displayed.

url_excluded_characters

Additional characters to be disallowed from URLs, when detecting URLs under the mouse cursor. By default, all characters that are legal in URLs are allowed. Additionally, newlines are allowed (but stripped). This is to accommodate programs such as mutt that add hard line breaks even for continued lines. `\n` can be added to this option to disable this behavior. Special characters can be specified using backslash escapes, to specify a backslash use a double backslash.

show_hyperlink_targets

    show_hyperlink_targets no

When the mouse hovers over a terminal hyperlink, show the actual URL that will be activated when the hyperlink is clicked.

underline_hyperlinks

    underline_hyperlinks hover

Control how hyperlinks are underlined. They can either be underlined on mouse `hover`, `always` (i.e. permanently underlined) or `never` which means that kitty will not apply any underline styling to hyperlinks. Note that the value of `always` only applies to real (OSC 8) hyperlinks not text that is detected to be a URL on mouse hover. Uses the `url_style` and `url_color` settings for the underline style. Note that reloading the config and changing this value to/from `always` will only affect text subsequently received by kitty.

copy_on_select

    copy_on_select no

Copy to clipboard or a private buffer on select. With this set to `clipboard`, selecting text with the mouse will cause the text to be copied to clipboard. Useful on platforms such as macOS that do not have the concept of primary selection. You can instead specify a name such as `a1` to copy to a private kitty buffer. Map a shortcut with the `paste_from_buffer` action to paste from this private buffer. For example:

    copy_on_select a1
    map shift+cmd+v paste_from_buffer a1

Note that copying to the clipboard is a security risk, as all programs, including websites open in your browser can read the contents of the system clipboard.

clear_selection_on_clipboard_loss

    clear_selection_on_clipboard_loss no

When the contents of the clipboard no longer reflect the current selection, clear it. This is primarily useful on platforms such as Linux where selecting text automatically copies it to a special “primary selection” clipboard or if you have `copy_on_select` set to `clipboard`.

Note that on macOS the system does not provide notifications when the clipboard owner is changed, so there, copying to clipboard in a non-kitty application will not clear selections even if `copy_on_select` is enabled.

paste_actions

    paste_actions quote-urls-at-prompt,confirm

A comma separated list of actions to take when pasting or dropping text into the terminal. The supported paste actions are:

`quote-urls-at-prompt`:

  If the text being pasted is a URL and the cursor is at a shell prompt, automatically quote the URL (needs `shell_integration`).

`replace-dangerous-control-codes`

  Replace dangerous control codes from pasted text, without confirmation.

`replace-newline`

  Replace the newline character from pasted text, without confirmation.

`confirm`:

  Confirm the paste if the text to be pasted contains any terminal control codes as this can be dangerous, leading to code execution if the shell/program running in the terminal does not properly handle these.

`confirm-if-large`

  Confirm the paste if it is very large (larger than 16KB) as pasting large amounts of text into shells can be very slow.

`filter`:

  Run the filter_paste() function from the file `paste-actions.py` in the kitty config directory on the pasted text. The text returned by the function will be actually pasted.

`no-op`:

  Has no effect.

strip_trailing_spaces

    strip_trailing_spaces never

Remove spaces at the end of lines when copying to clipboard. A value of `smart` will do it when using normal selections, but not rectangle selections. A value of `always` will always do it.

select_by_word_characters

    select_by_word_characters @-./_~?&=%+#

Characters considered part of a word when double clicking. In addition to these characters any character that is marked as an alphanumeric character in the Unicode database will be matched.

select_by_word_characters_forward

Characters considered part of a word when extending the selection forward on double clicking. In addition to these characters any character that is marked as an alphanumeric character in the Unicode database will be matched.

If empty (default) `select_by_word_characters` will be used for both directions.

click_interval

    click_interval -1.0

The interval between successive clicks to detect double/triple clicks (in seconds). Negative numbers will use the system default instead, if available, or fallback to 0.5.

focus_follows_mouse

    focus_follows_mouse no

Set the active window to the window under the mouse when moving the mouse around. On macOS, this will also cause the OS Window under the mouse to be focused automatically when the mouse enters it.

pointer_shape_when_grabbed

    pointer_shape_when_grabbed arrow

The shape of the mouse pointer when the program running in the terminal grabs the mouse.

default_pointer_shape

    default_pointer_shape beam

The default shape of the mouse pointer.

pointer_shape_when_dragging

    pointer_shape_when_dragging beam crosshair

The default shape of the mouse pointer when dragging across text. The optional second value sets the shape when dragging in rectangular selection mode.

### Mouse actions

Mouse buttons can be mapped to perform arbitrary actions. The syntax is:

    mouse_map button-name event-type modes action

Where `button-name` is one of `left`, `middle`, `right`, `b1` … `b8` with added keyboard modifiers. For example: `ctrl+shift+left` refers to holding the `Ctrl`+`Shift` keys while clicking with the left mouse button. The value `b1` … `b8` can be used to refer to up to eight buttons on a mouse.

`event-type` is one of `press`, `release`, `doublepress`, `triplepress`, `click`, `doubleclick`. `modes` indicates whether the action is performed when the mouse is grabbed by the program running in the terminal, or not. The values are `grabbed` or `ungrabbed` or a comma separated combination of them. `grabbed` refers to when the program running in the terminal has requested mouse events. Note that the click and double click events have a delay of `click_interval` to disambiguate from double and triple presses.

You can run kitty with the `kitty --debug-input` command line option to see mouse events. See the builtin actions below to get a sense of what is possible.

If you want to unmap a button, map it to nothing. For example, to disable opening of URLs with a plain click:

    mouse_map left click ungrabbed

See all the mappable actions including mouse actions here.

Note

Once a selection is started, releasing the button that started it will automatically end it and no release event will be dispatched.

clear_all_mouse_actions

    clear_all_mouse_actions no

Remove all mouse action definitions up to this point. Useful, for instance, to remove the default mouse actions.

Click the link under the mouse or move the cursor

    mouse_map left click ungrabbed mouse_handle_click selection link prompt

First check for a selection and if one exists do nothing. Then check for a link under the mouse cursor and if one exists, click it. Finally check if the click happened at the current shell prompt and if so, move the cursor to the click location. Note that this requires shell integration to work.

Click the link under the mouse or move the cursor even when grabbed

    mouse_map shift+left click grabbed,ungrabbed mouse_handle_click selection link prompt

Same as above, except that the action is performed even when the mouse is grabbed by the program running in the terminal.

Click the link under the mouse cursor

    mouse_map ctrl+shift+left release grabbed,ungrabbed mouse_handle_click link

Variant with `Ctrl`+`Shift` is present because the simple click based version has an unavoidable delay of `click_interval`, to disambiguate clicks from double clicks.

Discard press event for link click

    mouse_map ctrl+shift+left press grabbed discard_event

Prevent this press event from being sent to the program that has grabbed the mouse, as the corresponding release event is used to open a URL.

Paste from the primary selection

    mouse_map middle release ungrabbed paste_from_selection

Start selecting text

    mouse_map left press ungrabbed mouse_selection normal

Start selecting text in a rectangle

    mouse_map ctrl+alt+left press ungrabbed mouse_selection rectangle

Select a word

    mouse_map left doublepress ungrabbed mouse_selection word

Select a line

    mouse_map left triplepress ungrabbed mouse_selection line

Select line from point

    mouse_map ctrl+alt+left triplepress ungrabbed mouse_selection line_from_point

Select from the clicked point to the end of the line. If you would like to select the word at the point and then extend to the rest of the line, change line_from_point to word_and_line_from_point.

Extend the current selection

    mouse_map right press ungrabbed mouse_selection extend

If you want only the end of the selection to be moved instead of the nearest boundary, use `move-end` instead of `extend`.

Extend the current selection with shift

    mouse_map shift+left press ungrabbed mouse_selection extend

If you want only the end of the selection to be moved instead of the nearest boundary, use `move-end` instead of `extend`.

Paste from the primary selection even when grabbed

    mouse_map shift+middle release ungrabbed,grabbed paste_selection
    mouse_map shift+middle press grabbed discard_event

Start selecting text even when grabbed

    mouse_map shift+left press grabbed mouse_selection normal

Start selecting text in a rectangle even when grabbed

    mouse_map ctrl+shift+alt+left press ungrabbed,grabbed mouse_selection rectangle

Select a word even when grabbed

    mouse_map shift+left doublepress ungrabbed,grabbed mouse_selection word

Select a line even when grabbed

    mouse_map shift+left triplepress ungrabbed,grabbed mouse_selection line

Select line from point even when grabbed

    mouse_map ctrl+shift+alt+left triplepress ungrabbed,grabbed mouse_selection line_from_point

Select from the clicked point to the end of the line even when grabbed. If you would like to select the word at the point and then extend to the rest of the line, change line_from_point to word_and_line_from_point.

Extend the current selection even when grabbed

    mouse_map shift+right press ungrabbed,grabbed mouse_selection extend

Show clicked command output in pager

    mouse_map ctrl+shift+right press ungrabbed mouse_show_command_output

Requires shell integration to work.

## Performance tuning

repaint_delay

    repaint_delay 10

Delay between screen updates (in milliseconds). Decreasing it, increases frames-per-second (FPS) at the cost of more CPU usage. The default value yields ~100 FPS which is more than sufficient for most uses. Note that to actually achieve 100 FPS, you have to either set `sync_to_monitor` to `no` or use a monitor with a high refresh rate. Also, to minimize latency when there is pending input to be processed, this option is ignored.

input_delay

    input_delay 3

Delay before input from the program running in the terminal is processed (in milliseconds). Note that decreasing it will increase responsiveness, but also increase CPU usage and might cause flicker in full screen programs that redraw the entire screen on each loop, because kitty is so fast that partial screen updates will be drawn. This setting is ignored when the input buffer is almost full.

sync_to_monitor

    sync_to_monitor yes

Sync screen updates to the refresh rate of the monitor. This prevents screen tearing when scrolling. However, it limits the rendering speed to the refresh rate of your monitor. With a very high speed mouse/high keyboard repeat rate, you may notice some slight input latency. If so, set this to `no`.

## Terminal bell

enable_audio_bell

    enable_audio_bell yes

The audio bell. Useful to disable it in environments that require silence.

visual_bell_duration

    visual_bell_duration 0.0

The visual bell duration (in seconds). Flash the screen when a bell occurs for the specified number of seconds. Set to zero to disable. The flash is animated, fading in and out over the specified duration. The easing function used for the fading can be controlled. For example, `2.0 linear` will casuse the flash to fade in and out linearly. The default if unspecified is to use `ease-in-out` which fades slowly at the start, middle and end. You can specify different easing functions for the fade-in and fade-out parts, like this: `2.0 ease-in linear`. kitty supports all the CSS easing functions.

visual_bell_color

    visual_bell_color none

The color used by visual bell. Set to `none` will fall back to selection background color. If you feel that the visual bell is too bright, you can set it to a darker color.

window_alert_on_bell

    window_alert_on_bell yes

Request window attention on bell. Makes the dock icon bounce on macOS or the taskbar flash on Linux.

bell_on_tab

    bell_on_tab "🔔 "

Some text or a Unicode symbol to show on the tab if a window in the tab that does not have focus has a bell. If you want to use leading or trailing spaces, surround the text with quotes. See `tab_title_template` for how this is rendered.

For backwards compatibility, values of `yes`, `y` and `true` are converted to the default bell symbol and `no`, `n`, `false` and `none` are converted to the empty string.

command_on_bell

    command_on_bell none

Program to run when a bell occurs. The environment variable `KITTY_CHILD_CMDLINE` can be used to get the program running in the window in which the bell occurred.

macos_dock_badge_on_bell

    macos_dock_badge_on_bell yes

Show a badge on kitty’s dock icon when a bell occurs and kitty is not the active application (macOS only). The badge is automatically cleared when kitty regains focus.

bell_path

    bell_path none

Path to a sound file to play as the bell sound. If set to `none`, the system default bell sound is used. Must be in a format supported by the operating systems sound API, such as WAV or OGA on Linux (libcanberra) or AIFF, MP3 or WAV on macOS (NSSound). Relative paths are resolved with respect to the kitty config directory.

linux_bell_theme

    linux_bell_theme __custom

The XDG Sound Theme kitty will use to play the bell sound. On Wayland, when the compositor supports it, it is asked to play the system default bell sound, and this setting has no effect. Note that Hyprland claims to support this protocol, but does not actually play a sound. This setting defaults to the custom theme name specified in the XDG Sound theme specification with the contents:

> [Sound Theme]

> Inherits=name-of-the-sound-theme-you-want-to-use

Replace `name-of-the-sound-theme-you-want-to-use` with the actual theme name. Now all compliant applications should use sounds from this theme.

## Window layout

remember_window_size, initial_window_width, initial_window_height

    remember_window_size  yes
    initial_window_width  640
    initial_window_height 400

If enabled, the OS Window size will be remembered so that new instances of kitty will have the same size as the previous instance. If disabled, the OS Window will initially have size configured by initial_window_width/height, in pixels. You can use a suffix of “c” on the width/height values to have them interpreted as number of cells instead of pixels.

remember_window_position

    remember_window_position no

If enabled, the OS Window position will be remembered so that new instances of kitty will have the same position as the previous instance. If disabled, the OS Window will be placed by the window manager. Note that remembering of position only works if the underlying desktop environment/window manager supports it. It never works on Wayland. See also `kitty --position` to specify the position when launching kitty.

enabled_layouts

    enabled_layouts *

The enabled window layouts. A comma separated list of layout names. The special value `all` means all layouts. The first listed layout will be used as the startup layout. Default configuration is all layouts in alphabetical order. For a list of available layouts, see the Layouts.

window_resize_step_cells, window_resize_step_lines

    window_resize_step_cells 2
    window_resize_step_lines 2

The step size (in units of cell width/cell height) to use when resizing kitty windows in a layout with the shortcut `ctrl+shift+r`. The cells value is used for horizontal resizing, and the lines value is used for vertical resizing.

window_border_width

    window_border_width 0.5pt

The width of window borders. Can be either in pixels (px) or pts (pt). Values in pts will be rounded to the nearest number of pixels based on screen resolution. If not specified, the unit is assumed to be pts. Note that borders are displayed only when more than one window is visible. They are meant to separate multiple windows.

draw_minimal_borders

    draw_minimal_borders yes

Draw only the minimum borders needed. This means that only the borders that separate the window from a neighbor are drawn. Note that setting a non-zero `window_margin_width` overrides this and causes all borders to be drawn.

draw_window_borders_for_single_window

    draw_window_borders_for_single_window no

Draw borders around a window even when there is only a single window visible. When enabled and there is only a single window, full borders are drawn around it (as if `draw_minimal_borders` is false). The border will show in the active color when the window is focused and the OS window has focus, and in the inactive color when the OS window loses focus. This provides a clear visual indicator of whether the kitty window is focused. When there are multiple windows visible, this option has no effect and normal border drawing rules apply.

window_margin_width

    window_margin_width 0

The window margin (in pts) (blank area outside the border). A single value sets all four sides. Two values set the vertical and horizontal sides. Three values set top, horizontal and bottom. Four values set top, right, bottom and left.

single_window_margin_width

    single_window_margin_width -1

The window margin to use when only a single window is visible (in pts). Negative values will cause the value of `window_margin_width` to be used instead. A single value sets all four sides. Two values set the vertical and horizontal sides. Three values set top, horizontal and bottom. Four values set top, right, bottom and left.

window_padding_width

    window_padding_width 0

The window padding (in pts) (blank area between the text and the window border). A single value sets all four sides. Two values set the vertical and horizontal sides. Three values set top, horizontal and bottom. Four values set top, right, bottom and left.

single_window_padding_width

    single_window_padding_width -1

The window padding to use when only a single window is visible (in pts). Negative values will cause the value of `window_padding_width` to be used instead. A single value sets all four sides. Two values set the vertical and horizontal sides. Three values set top, horizontal and bottom. Four values set top, right, bottom and left.

placement_strategy

    placement_strategy center

When the window size is not an exact multiple of the cell size, the cell area of the terminal window will have some extra padding on the sides. You can control how that padding is distributed with this option. Using a value of `center` means the cell area will be placed centrally. A value of `top-left` means the padding will be only at the bottom and right edges. The value can be one of: `top-left`, `top`, `top-right`, `left`, `center`, `right`, `bottom-left`, `bottom`, `bottom-right`.

active_border_color

    active_border_color #00ff00

The color for the border of the active window. Set this to `none` to not draw borders around the active window.

inactive_border_color

    inactive_border_color #cccccc

The color for the border of inactive windows.

bell_border_color

    bell_border_color #ff5a00

The color for the border of inactive windows in which a bell has occurred.

inactive_text_alpha

    inactive_text_alpha 1.0

Fade the text in inactive windows by the specified amount (a number between zero and one, with zero being fully faded).

hide_window_decorations

    hide_window_decorations no

Hide the window decorations (title-bar and window borders) with `yes`. On macOS, `titlebar-only` and `titlebar-and-corners` can be used to only hide the titlebar and the rounded corners.

On Wayland, `titlebar-only` can be used to hide the titlebar while keeping the window shadow for resizing. On compositors that have server-side decorations (such as anything but GNOME), both `yes` and `titlebar-only` force client-side decoration mode.

Whether this works and exactly what effect it has depends on the window manager/operating system. Note that the effects of changing this option when reloading config are undefined. When using `titlebar-only` on macOS, it is useful to also set `window_margin_width` and `placement_strategy` to prevent the rounded corners from clipping text. Or use `titlebar-and-corners`.

window_logo_path

    window_logo_path none

Path to a logo image. Must be in PNG/JPEG/WEBP/GIF/TIFF/BMP format. Relative paths are interpreted relative to the kitty config directory. The logo is displayed in a corner of every kitty window. The position is controlled by `window_logo_position`. Individual windows can be configured to have different logos either using the `launch` action or the remote control facility.

window_logo_position

    window_logo_position bottom-right

Where to position the window logo in the window. The value can be one of: `top-left`, `top`, `top-right`, `left`, `center`, `right`, `bottom-left`, `bottom`, `bottom-right`.

window_logo_alpha

    window_logo_alpha 0.5

The amount the logo should be faded into the background. With zero being fully faded and one being fully opaque.

window_logo_scale

    window_logo_scale 0

The percentage (0-100] of the window size to which the logo should scale. Using a single number means the logo is scaled to that percentage of the shortest window dimension, while preserving aspect ratio of the logo image.

Using two numbers means the width and height of the logo are scaled to the respective percentage of the window’s width and height.

Using zero as the percentage disables scaling in that dimension. A single zero (the default) disables all scaling of the window logo.

resize_debounce_time

    resize_debounce_time 0.1 0.5

The time to wait (in seconds) before asking the program running in kitty to resize and redraw the screen during a live resize of the OS window, when no new resize events have been received, i.e. when resizing is either paused or finished. On platforms such as macOS, where the operating system sends events corresponding to the start and end of a live resize, the second number is used for redraw-after-pause since kitty can distinguish between a pause and end of resizing. On such systems the first number is ignored and redraw is immediate after end of resize. On other systems only the first number is used so that kitty is “ready” quickly after the end of resizing, while not also continuously redrawing, to save energy.

resize_in_steps

    resize_in_steps no

Resize the OS window in steps as large as the cells, instead of with the usual pixel accuracy. Combined with `initial_window_width` and `initial_window_height` in number of cells, this option can be used to keep the margins as small as possible when resizing the OS window. Note that this does not currently work on Wayland.

visual_window_select_characters

    visual_window_select_characters 1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ

The list of characters for visual window selection. For example, for selecting a window to focus on with `ctrl+shift+f7`. The value should be a series of unique numbers or alphabets, case insensitive, from the set `0-9A-Z`-=[];',./\`. Specify your preference as a string of characters.

confirm_os_window_close

    confirm_os_window_close -1

Ask for confirmation when closing an OS window or a tab with at least this number of kitty windows in it by window manager (e.g. clicking the window close button or pressing the operating system shortcut to close windows) or by the `close_tab` action. A value of zero disables confirmation. This confirmation also applies to requests to quit the entire application (all OS windows, via the `quit` action). Negative values are converted to positive ones, however, with `shell_integration` enabled, using negative values means windows sitting at a shell prompt are not counted, only windows where some command is currently running. You can also have backgrounded jobs prevent closing, by adding `count-background` to the setting, for example: `-1 count-background`. Note that if you want confirmation when closing individual windows, you can map the `close_window_with_confirmation` action.

window_drag_tolerance

    window_drag_tolerance 2

Control dragging window borders to resize kitty windows. This is the tolerance in pts for the region around window borders where pressing the left mouse button will start the dragging of window borders. Use a large negative value such as -200 to disable dragging of borders. Note that because kitty uses layouts, dragging borders does not actually resize the window itself, but instead, the layout row/column/slot, which can result in multiple windows getting resized.

window_title_bar

    window_title_bar top

Control the position of the window title bar relative to the window content. Use `window_title_bar_min_windows` to control when title bars are shown. Use `window_title_template` to format the displayed window title.

window_title_bar_min_windows

    window_title_bar_min_windows 0

The minimum number of visible windows in a tab before window title bars are shown. A value of `0` means never show. `1` means always show. `2` or more means show only when at least that many windows are visible. Similar to `tab_bar_min_tabs` for the tab bar.

window_title_template

    window_title_template "{fmt.fg.red}{bell_symbol}{activity_symbol}{fmt.fg.window}{progress_percent}{title}"

A template to render the window title bar text. Uses the same template syntax as `tab_title_template`. Available variables include: `{title}`, `{bell_symbol}`, `{activity_symbol}`, `{progress_percent}`, `{custom}`, `{fmt}`, `{is_active}`. You can also provide a custom `draw_window_title(data)` function in `window_title_bar.py` in the kitty config directory, exposed as `{custom}`.

active_window_title_template

    active_window_title_template none

Template to use for the active window title bar. If not set (the value `none`), the `window_title_template` is used.

window_title_bar_active_foreground

    window_title_bar_active_foreground none

Foreground color for the active window title bar. Defaults to the corresponding tab bar color (`active_tab_foreground`) when set to `none`.

window_title_bar_active_background

    window_title_bar_active_background none

Background color for the active window title bar. Defaults to the corresponding tab bar color (`active_tab_background`) when set to `none`.

window_title_bar_inactive_foreground

    window_title_bar_inactive_foreground none

Foreground color for inactive window title bars. Defaults to the corresponding tab bar color (`inactive_tab_foreground`) when set to `none`.

window_title_bar_inactive_background

    window_title_bar_inactive_background none

Background color for inactive window title bars. Defaults to the corresponding tab bar color (`inactive_tab_background`) when set to `none`.

window_title_bar_align

    window_title_bar_align center

Horizontal alignment of the text in window title bars.

## Tab bar

tab_bar_edge

    tab_bar_edge bottom

The edge to show the tab bar on, `top` or `bottom`.

tab_bar_margin_width

    tab_bar_margin_width 0.0

The margin to the left and right of the tab bar (in pts).

tab_bar_margin_height

    tab_bar_margin_height 0.0 0.0

The margin above and below the tab bar (in pts). The first number is the margin between the edge of the OS Window and the tab bar. The second number is the margin between the tab bar and the contents of the current tab.

tab_bar_style

    tab_bar_style fade

The tab bar style, can be one of:

`fade`

  Each tab’s edges fade into the background color. (See also `tab_fade`)

`slant`

  Tabs look like the tabs in a physical file.

`separator`

  Tabs are separated by a configurable separator. (See also `tab_separator`)

`powerline`

  Tabs are shown as a continuous line with “fancy” separators. (See also `tab_powerline_style`)

`custom`

  A user-supplied Python function called draw_tab is loaded from the file `tab_bar.py` in the kitty config directory. For examples of how to write such a function, see the functions named `draw_tab_with_*` in kitty’s source code: `kitty/tab_bar.py`. See also this discussion for examples from kitty users.

`hidden`

  The tab bar is hidden. If you use this, you might want to create a mapping for the `select_tab` action which presents you with a list of tabs and allows for easy switching to a tab.

tab_bar_filter

A search expression. Only tabs that match this expression will be shown in the tab bar. The currently active tab is always shown, regardless of whether it matches or not. When using this option, the tab bar may be displayed with less tabs than specified in `tab_bar_min_tabs`, as evaluating the filter is expensive and is done only at display time. This is most useful when using sessions. An expression of `session:~ or session:^$` will show only tabs that belong to the current session or no session. The various tab navigation actions such as `goto_tab`, `next_tab`, `previous_tab`, etc. are automatically restricted to work only on matching tabs.

tab_bar_align

    tab_bar_align left

The horizontal alignment of the tab bar, can be one of: `left`, `center`, `right`.

tab_bar_min_tabs

    tab_bar_min_tabs 2

The minimum number of tabs that must exist before the tab bar is shown.

tab_switch_strategy

    tab_switch_strategy previous

The algorithm to use when switching to a tab when the current tab is closed. The default of `previous` will switch to the last used tab. A value of `left` will switch to the tab to the left of the closed tab. A value of `right` will switch to the tab to the right of the closed tab. A value of `last` will switch to the right-most tab.

tab_fade

    tab_fade 0.25 0.5 0.75 1

Control how each tab fades into the background when using `fade` for the `tab_bar_style`. Each number is an alpha (between zero and one) that controls how much the corresponding cell fades into the background, with zero being no fade and one being full fade. You can change the number of cells used by adding/removing entries to this list.

tab_separator

    tab_separator " ┇"

The separator between tabs in the tab bar when using `separator` as the `tab_bar_style`.

tab_powerline_style

    tab_powerline_style angled

The powerline separator style between tabs in the tab bar when using `powerline` as the `tab_bar_style`, can be one of: `angled`, `slanted`, `round`.

tab_activity_symbol

    tab_activity_symbol none

Some text or a Unicode symbol to show on the tab if a window in the tab that does not have focus has some activity. If you want to use leading or trailing spaces, surround the text with quotes. See `tab_title_template` for how this is rendered.

tab_title_max_length

    tab_title_max_length 0

The maximum number of cells that can be used to render the text in a tab. A value of zero means that no limit is applied.

tab_title_template

    tab_title_template "{fmt.fg.red}{bell_symbol}{activity_symbol}{fmt.fg.tab}{tab.last_focused_progress_percent}{title}"

A template to render the tab title. The default just renders the title with optional symbols for bell and activity. If you wish to include the tab-index as well, use something like: `{index}:{title}`. Useful if you have shortcuts mapped for `goto_tab N`. If you prefer to see the index as a superscript, use `{sup.index}`. All data available is:

`title`

  The current tab title.

`index`

  The tab index usable with `goto_tab N` shortcuts.

`layout_name`

  The current layout name.

`session_name`

  The name of the kitty session file from which this tab was created, if any.

`active_session_name`

  The name of the kitty session file from which the active window in this tab was created, if any.

`num_windows`

  The number of windows in the tab.

`num_window_groups`

  The number of window groups (a window group is a window and all of its overlay windows) in the tab.

`tab.active_wd`

  The working directory of the currently active window in the tab (expensive, requires syscall). Use `tab.active_oldest_wd` to get the directory of the oldest foreground process rather than the newest.

`tab.active_exe`

  The name of the executable running in the foreground of the currently active window in the tab (expensive, requires syscall). Use `tab.active_oldest_exe` for the oldest foreground process.

`max_title_length`

  The maximum title length available.

`keyboard_mode`

  The name of the current keyboard mode or the empty string if no keyboard mode is active.

`tab.last_focused_progress_percent`

  If a command running in a window reports the progress for a task, show this progress as a percentage from the most recently focused window in the tab. Empty string if no progress is reported.

`tab.progress_percent`

  If a command running in a window reports the progress for a task, show this progress as a percentage from all windows in the tab, averaged. Empty string is no progress is reported.

`custom`

  This will call a function named `draw_title(data)` from the file `tab_bar.py` placed in the kitty config directory. The function will be passed a dictionary of data, the same data that can be used in this template. It can then perform arbitrarily complex processing and return a string. For example: `tab_title_template "{custom}"` will use the output of the function as the tab title. Any print statements in the `draw_title()` will print to the STDOUT of the kitty process, useful for debugging.

Note that formatting is done by Python’s string formatting machinery, so you can use, for instance, `{layout_name[:2].upper()}` to show only the first two letters of the layout name, upper-cased. If you want to style the text, you can use styling directives, for example: `{fmt.fg.red}red{fmt.fg.tab}normal{fmt.bg._00FF00}greenbg{fmt.bg.tab}`. Similarly, for bold and italic: `{fmt.bold}bold{fmt.nobold}normal{fmt.italic}italic{fmt.noitalic}`. The 256 eight terminal colors can be used as `fmt.fg.color0` through `fmt.fg.color255`. Note that for backward compatibility, if `{bell_symbol}` or `{activity_symbol}` are not present in the template, they are prepended to it.

active_tab_title_template

    active_tab_title_template none

Template to use for active tabs. If not specified falls back to `tab_title_template`.

active_tab_foreground, active_tab_background, active_tab_font_style, inactive_tab_foreground, inactive_tab_background, inactive_tab_font_style

    active_tab_foreground   #000
    active_tab_background   #eee
    active_tab_font_style   bold-italic
    inactive_tab_foreground #444
    inactive_tab_background #999
    inactive_tab_font_style normal

Tab bar colors and styles.

tab_bar_background

    tab_bar_background none

Background color for the tab bar. Defaults to using the terminal background color.

tab_bar_margin_color

    tab_bar_margin_color none

Color for the tab bar margin area. Defaults to using the terminal background color for margins above and below the tab bar. For side margins the default color is chosen to match the background color of the neighboring tab, unless the window is translucent, in which case the default background is used as it looks better.

tab_bar_drag_threshold

    tab_bar_drag_threshold 5

Control when dragging of tabs to re-order them happens. The value is the drag threshold in pixels, the distance the mouse must move before a drag begins. A value of zero disables tab dragging entirely. Dragging a tab to another kitty window moves it there, while dragging outside any kitty window detaches it into a new OS window.

Note that on Wayland, because of poor design cancelling a drag will detach the tab. This is worked around for compositors that support xdg-toplevel-drag.

## Color scheme

foreground, background

    foreground #dddddd
    background #000000

The foreground and background colors.

background_opacity

    background_opacity 1.0

The opacity of the terminal background color. A number between zero and one, where one is opaque and zero is fully transparent. This will only work if supported by the OS (for instance, when using a compositor under X11). Note that it only sets the background color’s opacity in cells that have the same background color as the default terminal background, so that things like the status bar in vim, powerline prompts, etc. still look good. But it means that if you use a color theme with a background color in your editor, it will not be rendered as transparent. Instead you should change the default background color in your kitty config and not use a background color in the editor color scheme. Or use the escape codes to set the terminals default colors in a shell script to launch your editor. See also `transparent_background_colors`. Be aware that using a value less than 1.0 is a (possibly significant) performance hit. When using a low value for this setting, it is desirable that you set the `background` color to a color the matches the general color of the desktop background, for best text rendering. Note also, that this setting does not apply to the `background_image`, if any. The background image can itself have transparency via its alpha channel if desired, and that will be respected.

If you want to dynamically change transparency of windows, set `dynamic_background_opacity` to `yes` (this is off by default as it has a performance cost). Changing this option when reloading the config will only work if `dynamic_background_opacity` was enabled in the original config.

background_blur

    background_blur 0

Set to a positive value to enable background blur (blurring of the visuals behind a transparent window) on platforms that support it. Only takes effect when `background_opacity` is less than one. On macOS, this will also control the blur radius (amount of blurring). Setting it to too high a value will cause severe performance issues and/or rendering artifacts. Usually, values up to 64 work well. Note that this might cause performance issues, depending on how the platform implements it, so use with care. Currently supported on macOS and Wayland, when the compositor supports the background blur extension.

transparent_background_colors

A space separated list of upto 7 colors, with opacity. When the background color of a cell matches one of these colors, it is rendered semi-transparent using the specified opacity.

Useful in more complex UIs like editors where you could want more than a single background color to be rendered as transparent, for instance, for a cursor highlight line background or a highlighted block. Terminal applications can set this color using The kitty color control escape code.

The syntax for specifying colors is: `color@opacity`, where the `@opacity` part is optional. When unspecified, the value of `background_opacity` is used. For example:

    transparent_background_colors red@0.5 #00ff00@0.3

Note that you must also set `background_opacity` to something less than 1 for this setting to work properly.

dynamic_background_opacity

    dynamic_background_opacity no

Allow changing of the `background_opacity` dynamically, using either keyboard shortcuts (`ctrl+shift+a>m` and `ctrl+shift+a>l`) or the remote control facility. Changing this option by reloading the config is not supported.

background_image

    background_image none

Path to a background image. Must be in PNG/JPEG/WEBP/TIFF/GIF/BMP format. Note that when using Change color themes automatically when the OS switches between light and dark this option is overridden by the color scheme file and must be set inside it to take effect.

background_image_layout

    background_image_layout tiled

Whether to tile, scale or clamp the background image. The value can be one of `tiled`, `mirror-tiled`, `scaled`, `clamped`, `centered` or `cscaled`. The `scaled` and `cscaled` values scale the image to the window size, with `cscaled` preserving the image aspect ratio. Note that when using Change color themes automatically when the OS switches between light and dark this option is overridden by the color scheme file and must be set inside it to take effect.

background_image_linear

    background_image_linear no

When background image is scaled, whether linear interpolation should be used. Note that when using Change color themes automatically when the OS switches between light and dark this option is overridden by the color scheme file and must be set inside it to take effect.

background_tint

    background_tint 0.0

How much to tint the background image by the background color. This option makes it easier to read the text. Tinting is done using the current background color for each window. This option applies only if `background_image` is set. Note that when using Change color themes automatically when the OS switches between light and dark this option is overridden by the color scheme file and must be set inside it to take effect.

background_tint_gaps

    background_tint_gaps 1.0

How much to tint the background image at the window gaps by the background color, after applying `background_tint`. Since this is multiplicative with `background_tint`, it can be used to lighten the tint over the window gaps for a separated look. Note that when using Change color themes automatically when the OS switches between light and dark this option is overridden by the color scheme file and must be set inside it to take effect.

dim_opacity

    dim_opacity 0.4

How much to dim text that has the DIM/FAINT attribute set. One means no dimming and zero means fully dimmed (i.e. invisible).

selection_foreground, selection_background

    selection_foreground #000000
    selection_background #fffacd

The foreground and background colors for text selected with the mouse. Setting both of these to `none` will cause a “reverse video” effect for selections, where the selection will be the cell text color and the text will become the cell background color. Setting only selection_foreground to `none` will cause the foreground color to be used unchanged. Note that these colors can be overridden by the program running in the terminal.

### The color table

The 256 terminal colors. There are 8 basic colors, each color has a dull and bright version, for the first 16 colors. You can set the remaining 240 colors as color16 to color255.

color0, color8

    color0 #000000
    color8 #767676

black

color1, color9

    color1 #cc0403
    color9 #f2201f

red

color2, color10

    color2  #19cb00
    color10 #23fd00

green

color3, color11

    color3  #cecb00
    color11 #fffd00

yellow

color4, color12

    color4  #0d73cc
    color12 #1a8fff

blue

color5, color13

    color5  #cb1ed1
    color13 #fd28ff

magenta

color6, color14

    color6  #0dcdcd
    color14 #14ffff

cyan

color7, color15

    color7  #dddddd
    color15 #ffffff

white

mark1_foreground

    mark1_foreground black

Color for marks of type 1

mark1_background

    mark1_background #98d3cb

Color for marks of type 1 (light steel blue)

mark2_foreground

    mark2_foreground black

Color for marks of type 2

mark2_background

    mark2_background #f2dcd3

Color for marks of type 1 (beige)

mark3_foreground

    mark3_foreground black

Color for marks of type 3

mark3_background

    mark3_background #f274bc

Color for marks of type 3 (violet)

### Wide gamut color formats

kitty supports modern wide gamut color formats including OKLCH and CIE LAB for precise color specification. These formats can be used anywhere a color value is accepted (foreground, background, color0-color255, etc.).

For detailed documentation on wide gamut color formats, syntax, and examples, see Wide gamut color formats.

## Advanced

shell

    shell .

The shell program to execute. The default value of `.` means to use the value of of the `SHELL` environment variable or if unset, whatever shell is set as the default shell for the current user. Note that on macOS if you change this, you might need to add `--login` and `--interactive` to ensure that the shell starts in interactive mode and reads its startup rc files. Environment variables are expanded in this setting.

editor

    editor .

The terminal based text editor (such as vim or nano) to use when editing the kitty config file or similar tasks.

The default value of `.` means to use the environment variables `VISUAL` and `EDITOR` in that order. If these variables aren’t set, kitty will run your `shell` (`$SHELL -l -i -c env`) to see if your shell startup rc files set `VISUAL` or `EDITOR`. If that doesn’t work, kitty will cycle through various known editors (vim, emacs, etc.) and take the first one that exists on your system.

close_on_child_death

    close_on_child_death no

Close the window when the child process (usually the shell) exits. With the default value `no`, the terminal will remain open when the child exits as long as there are still other processes outputting to the terminal (for example disowned or backgrounded processes). When enabled with `yes`, the window will close as soon as the child process exits. Note that setting it to `yes` means that any background processes still using the terminal can fail silently because their stdout/stderr/stdin no longer work.

remote_control_password

Allow other programs to control kitty using passwords. This option can be specified multiple times to add multiple passwords. If no passwords are present kitty will ask the user for permission if a program tries to use remote control with a password. A password can also optionally be associated with a set of allowed remote control actions. For example:

    remote_control_password "my passphrase" get-colors set-colors focus-window focus-tab

Only the specified actions will be allowed when using this password. Glob patterns can be used too, for example:

    remote_control_password "my passphrase" set-tab-* resize-*

To get a list of available actions, run:

    kitten @ --help

A set of actions to be allowed when no password is sent can be specified by using an empty password. For example:

    remote_control_password "" *-colors

Finally, the path to a python module can be specified that provides a function `is_cmd_allowed` that is used to check every remote control command. For example:

    remote_control_password "my passphrase" my_rc_command_checker.py

Relative paths are resolved from the kitty configuration directory. See Customizing authorization with your own program for details.

allow_remote_control

    allow_remote_control no

Allow other programs to control kitty. If you turn this on, other programs can control all aspects of kitty, including sending text to kitty windows, opening new windows, closing windows, reading the content of windows, etc. Note that this even works over SSH connections. The default setting of `no` prevents any form of remote control. The meaning of the various values are:

`password`

  Remote control requests received over both the TTY device and the socket are confirmed based on passwords, see `remote_control_password`.

`socket-only`

  Remote control requests received over a socket are accepted unconditionally. Requests received over the TTY are denied. See `listen_on`.

`socket`

  Remote control requests received over a socket are accepted unconditionally. Requests received over the TTY are confirmed based on password.

`no`

  Remote control is completely disabled.

`yes`

  Remote control requests are always accepted.

listen_on

    listen_on none

Listen to the specified socket for remote control connections. Note that this will apply to all kitty instances. It can be overridden by the `kitty --listen-on` command line option. For UNIX sockets, such as `unix:${TEMP}/mykitty` or `unix:@mykitty` (on Linux). Environment variables are expanded and relative paths are resolved with respect to the temporary directory. If `{kitty_pid}` is present, then it is replaced by the PID of the kitty process, otherwise the PID of the kitty process is appended to the value, with a hyphen. For TCP sockets such as `tcp:localhost:0` a random port is always used even if a non-zero port number is specified. See the help for `kitty --listen-on` for more details. Note that this will be ignored unless `allow_remote_control` is set to either: `yes`, `socket` or `socket-only`. Changing this option by reloading the config is not supported.

env

Specify the environment variables to be set in all child processes. Using the name with an equal sign (e.g. `env VAR=`) will set it to the empty string. Specifying only the name (e.g. `env VAR`) will remove the variable from the child process’ environment. Note that environment variables are expanded recursively, for example:

    env VAR1=a
    env VAR2=${HOME}/${VAR1}/b

The value of `VAR2` will be `<path to home directory>/a/b`.

Use the special value `read_from_shell` to have kitty read the specified variables from your `login shell` configuration. Useful if your shell startup files setup a bunch of environment variables that you want available to kitty and in kitty session files. Each variable name is treated as a glob pattern to match. For example: `env read_from_shell=PATH LANG LC_* XDG_* EDITOR VISUAL`. Note that these variables are only read after the configuration is fully processed, thus they are not available for recursive expansion and they will override any variables set by other `env` directives.

filter_notification

Specify rules to filter out notifications sent by applications running in kitty. Can be specified multiple times to create multiple filter rules. A rule specification is of the form `field:regexp`. A filter rule can match on any of the fields: `title`, `body`, `app`, `type`. The special value of `all` filters out all notifications. Rules can be combined using Boolean operators. Some examples:

    filter_notification title:hello or body:"abc.*def"
    # filter out notification from vim except for ones about updates, (?i)
    # makes matching case insensitive.
    filter_notification app:"[ng]?vim" and not body:"(?i)update"
    # filter out all notifications
    filter_notification all

The field `app` is the name of the application sending the notification and `type` is the type of the notification. Not all applications will send these fields, so you can also match on the title and body of the notification text. More sophisticated programmatic filtering and custom actions on notifications can be done by creating a notifications.py file in the kitty config directory (`~/.config/kitty`). An annotated sample is available.

watcher

Path to python file which will be loaded for Watching launched windows. Can be specified more than once to load multiple watchers. The watchers will be added to every kitty window. Relative paths are resolved relative to the kitty config directory. Note that reloading the config will only affect windows created after the reload.

exe_search_path

Control where kitty finds the programs to run. The default search order is: First search the system wide `PATH`, then `~/.local/bin` and `~/bin`. If still not found, the `PATH` defined in the login shell after sourcing all its startup files is tried. Finally, if present, the `PATH` specified by the `env` option is tried.

This option allows you to prepend, append, or remove paths from this search order. It can be specified multiple times for multiple paths. A simple path will be prepended to the search order. A path that starts with the `+` sign will be append to the search order, after `~/bin` above. A path that starts with the `-` sign will be removed from the entire search order. For example:

    exe_search_path /some/prepended/path
    exe_search_path +/some/appended/path
    exe_search_path -/some/excluded/path

update_check_interval

    update_check_interval 24

The interval to periodically check if an update to kitty is available (in hours). If an update is found, a system notification is displayed informing you of the available update. The default is to check every 24 hours, set to zero to disable. Update checking is only done by the official binary builds. Distro packages or source builds do not do update checking. Changing this option by reloading the config is not supported.

startup_session

    startup_session none

Path to a session file to use for all kitty instances. Can be overridden by using the `kitty --session` `=none` command line option for individual instances. See Sessions in the kitty documentation for details. Note that relative paths are interpreted with respect to the kitty config directory. Environment variables in the path are expanded. Changing this option by reloading the config is not supported. Note that if kitty is invoked with command line arguments specifying a command to run, this option is ignored.

clipboard_control

    clipboard_control write-clipboard write-primary read-clipboard-ask read-primary-ask

Allow programs running in kitty to read and write from the clipboard. You can control exactly which actions are allowed. The possible actions are: `write-clipboard`, `read-clipboard`, `write-primary`, `read-primary`, `read-clipboard-ask`, `read-primary-ask`. The default is to allow writing to the clipboard and primary selection and to ask for permission when a program tries to read from the clipboard. Note that disabling the read confirmation is a security risk as it means that any program, even the ones running on a remote server via SSH can read your clipboard. See also `clipboard_max_size`.

clipboard_max_size

    clipboard_max_size 512

The maximum size (in MB) of data from programs running in kitty that will be stored for writing to the system clipboard. A value of zero means no size limit is applied. See also `clipboard_control`.

file_transfer_confirmation_bypass

The password that can be supplied to the file transfer kitten to skip the transfer confirmation prompt. This should only be used when initiating transfers from trusted computers, over trusted networks or encrypted transports, as it allows any programs running on the remote machine to read/write to the local filesystem, without permission.

allow_hyperlinks

    allow_hyperlinks yes

Process hyperlink escape sequences (OSC 8). If disabled OSC 8 escape sequences are ignored. Otherwise they become clickable links, that you can click with the mouse or by using the hints kitten. The special value of `ask` means that kitty will ask before opening the link when clicked.

shell_integration

    shell_integration enabled

Enable shell integration on supported shells. This enables features such as jumping to previous prompts, browsing the output of the previous command in a pager, etc. on supported shells. Set to `disabled` to turn off shell integration, completely. It is also possible to disable individual features, set to a space separated list of these values: `no-rc`, `no-cursor`, `no-title`, `no-cwd`, `no-prompt-mark`, `no-complete`, `no-sudo`. See Shell integration for details.

allow_cloning

    allow_cloning ask

Control whether programs running in the terminal can request new windows to be created. The canonical example is clone-in-kitty. By default, kitty will ask for permission for each clone request. Allowing cloning unconditionally gives programs running in the terminal (including over SSH) permission to execute arbitrary code, as the user who is running the terminal, on the computer that the terminal is running on.

clone_source_strategies

    clone_source_strategies venv,conda,env_var,path

Control what shell code is sourced when running clone-in-kitty in the newly cloned window. The supported strategies are:

`venv`

  Source the file `$VIRTUAL_ENV/bin/activate`. This is used by the Python stdlib venv module and allows cloning venvs automatically.

`conda`

  Run `conda activate $CONDA_DEFAULT_ENV`. This supports the virtual environments created by conda.

`env_var`

  Execute the contents of the environment variable `KITTY_CLONE_SOURCE_CODE` with `eval`.

`path`

  Source the file pointed to by the environment variable `KITTY_CLONE_SOURCE_PATH`.

This option must be a comma separated list of the above values. Only the first valid match, in the order specified, is sourced.

notify_on_cmd_finish

    notify_on_cmd_finish never

Show a desktop notification when a long-running command finishes (needs `shell_integration`). The possible values are:

`never`

  Never send a notification.

`unfocused`

  Only send a notification when the window does not have keyboard focus.

`invisible`

  Only send a notification when the window both is unfocused and not visible to the user, for example, because it is in an inactive tab or its OS window is not currently visible (on platforms that support OS window visibility querying this considers an OS Window visible iff it is active).

`always`

  Always send a notification, regardless of window state.

There are two optional arguments:

First, the minimum duration for what is considered a long running command. The default is 5 seconds. Specify a second argument to set the duration. For example: `invisible 15`. Do not set the value too small, otherwise a command that launches a new OS Window and exits will spam a notification.

Second, the action to perform. The default is `notify`. The possible values are:

`notify`

  Send a desktop notification. The subsequent arguments are optional and specify when the notification is automatically cleared. The set of possible events when the notification is cleared are: `focus` and `next`. `focus` means that when the notification policy is `unfocused` or `invisible` the notification is automatically cleared when the window regains focus. The value of `next` means that the previous notification is cleared when the next notification is shown. The default when no arguments are specified is: `focus next`.

`bell`

  Ring the terminal bell.

`notify-bell`

  Send a desktop notification and ring the terminal bell. The arguments are the same as for notify.

`command`

  Run a custom command. All subsequent arguments are the cmdline to run.

Some more examples:

    # Send a notification when a command takes more than 5 seconds in an unfocused window
    notify_on_cmd_finish unfocused
    # Send a notification when a command takes more than 10 seconds in a invisible window
    notify_on_cmd_finish invisible 10.0
    # Ring a bell when a command takes more than 10 seconds in a invisible window
    notify_on_cmd_finish invisible 10.0 bell
    # Run 'notify-send' when a command takes more than 10 seconds in a invisible window
    # Here %c is replaced by the current command line and %s by the job exit code
    notify_on_cmd_finish invisible 10.0 command notify-send "job finished with status: %s" %c
    # Do not clear previous notification when next command finishes or window regains focus
    notify_on_cmd_finish invisible 5.0 notify

term

    term xterm-kitty

The value of the `TERM` environment variable to set. Changing this can break many terminal programs, only change it if you know what you are doing, not because you read some advice on “Stack Overflow” to change it. The `TERM` variable is used by various programs to get information about the capabilities and behavior of the terminal. If you change it, depending on what programs you run, and how different the terminal you are changing it to is, various things from key-presses, to colors, to various advanced features may not work. Changing this option by reloading the config will only affect newly created windows.

terminfo_type

    terminfo_type path

The value of the `TERMINFO` environment variable to set. This variable is used by programs running in the terminal to search for terminfo databases. The default value of `path` causes kitty to set it to a filesystem location containing the kitty terminfo database. A value of `direct` means put the entire database into the env var directly. This can be useful when connecting to containers, for example. But, note that not all software supports this. A value of `none` means do not touch the variable.

forward_stdio

    forward_stdio no

Forward STDOUT and STDERR of the kitty process to child processes. This is useful for debugging as it allows child processes to print to kitty’s STDOUT directly. For example, `echo hello world >&$KITTY_STDIO_FORWARDED` in a shell will print to the parent kitty’s STDOUT. Sets the `KITTY_STDIO_FORWARDED=fdnum` environment variable so child processes know about the forwarding. Note that on macOS this prevents the shell from being run via the login utility so getlogin() will not work in programs run in this session.

menu_map

Specify entries for various menus in kitty. Currently only the global menubar on macOS is supported. For example:

    menu_map global "Actions::Launch something special" launch --hold --type=os-window sh -c "echo hello world"

This will create a menu entry named “Launch something special” in an “Actions” menu in the macOS global menubar. Sub-menus can be created by adding more levels separated by the `::` characters.

## OS specific tweaks

wayland_titlebar_color

    wayland_titlebar_color system

The color of the kitty window’s titlebar on Wayland systems with client side window decorations such as GNOME. A value of `system` means to use the default system colors, a value of `background` means to use the background color of the currently active kitty window and finally you can use an arbitrary color, such as `#12af59` or `red`.

macos_titlebar_color

    macos_titlebar_color system

The color of the kitty window’s titlebar on macOS. A value of `system` means to use the default system color, `light` or `dark` can also be used to set it explicitly. A value of `background` means to use the background color of the currently active window and finally you can use an arbitrary color, such as `#12af59` or `red`.

macos_option_as_alt

    macos_option_as_alt no

Use the `Option` key as an `Alt` key on macOS. With this set to `no`, kitty will use the macOS native `Option`+`Key` to enter Unicode character behavior. This will break any `Alt`+`Key` keyboard shortcuts in your terminal programs, but you can use the macOS Unicode input technique. You can use the values: `left`, `right` or `both` to use only the left, right or both `Option` keys as `Alt`, instead. Note that kitty itself always treats `Option` the same as `Alt`. This means you cannot use this option to configure different kitty shortcuts for `Option`+`Key` vs. `Alt`+`Key`. Also, any kitty shortcuts using `Option/Alt`+`Key` will take priority, so that any such key presses will not be passed to terminal programs running inside kitty. Changing this option by reloading the config is not supported.

macos_hide_from_tasks

    macos_hide_from_tasks no

Hide the kitty window from running tasks on macOS (`⌘`+`Tab` and the Dock). Changing this option by reloading the config is not supported.

macos_quit_when_last_window_closed

    macos_quit_when_last_window_closed no

Have kitty quit when all the top-level windows are closed on macOS. By default, kitty will stay running, even with no open windows, as is the expected behavior on macOS.

macos_window_resizable

    macos_window_resizable yes

Disable this if you want kitty top-level OS windows to not be resizable on macOS.

macos_thicken_font

    macos_thicken_font 0

Draw an extra border around the font with the given width, to increase legibility at small font sizes on macOS. For example, a value of `0.75` will result in rendering that looks similar to sub-pixel antialiasing at common font sizes. Note that in modern kitty, this option is obsolete (although still supported). Consider using `text_composition_strategy` instead.

macos_traditional_fullscreen

    macos_traditional_fullscreen no

Use the macOS traditional full-screen transition, that is faster, but less pretty.

macos_show_window_title_in

    macos_show_window_title_in all

Control where the window title is displayed on macOS. A value of `window` will show the title of the currently active window at the top of the macOS window. A value of `menubar` will show the title of the currently active window in the macOS global menu bar, making use of otherwise wasted space. A value of `all` will show the title in both places, and `none` hides the title. See `macos_menubar_title_max_length` for how to control the length of the title in the menu bar.

macos_menubar_title_max_length

    macos_menubar_title_max_length 0

The maximum number of characters from the window title to show in the macOS global menu bar. Values less than one means that there is no maximum limit.

macos_custom_beam_cursor

    macos_custom_beam_cursor no

Use a custom mouse cursor for macOS that is easier to see on both light and dark backgrounds. Nowadays, the default macOS cursor already comes with a white border. WARNING: this might make your mouse cursor invisible on dual GPU machines. Changing this option by reloading the config is not supported.

macos_colorspace

    macos_colorspace srgb

The colorspace in which to interpret terminal colors. The default of `srgb` will cause colors to match those seen in web browsers. The value of `default` will use whatever the native colorspace of the display is. The value of `displayp3` will use Apple’s special snowflake display P3 color space, which will result in over saturated (brighter) colors with some color shift. Reloading configuration will change this value only for newly created OS windows.

linux_display_server

    linux_display_server auto

Choose between Wayland and X11 backends. By default, an appropriate backend based on the system state is chosen automatically. Set it to `x11` or `wayland` to force the choice. Changing this option by reloading the config is not supported.

wayland_enable_ime

    wayland_enable_ime yes

Enable Input Method Extension on Wayland. This is typically used for inputting text in East Asian languages. However, its implementation in Wayland is often buggy and introduces latency into the input loop, so disable this if you know you dont need it. Changing this option by reloading the config is not supported, it will not have any effect.

## Keyboard shortcuts

Keys are identified simply by their lowercase Unicode characters. For example: `a` for the `A` key, `[` for the left square bracket key, etc. For functional keys, such as `Enter` or `Escape`, the names are present at Functional key definitions. For modifier keys, the names are `ctrl` (`control`, `⌃`), `shift` (`⇧`), `alt` (`opt`, `option`, `⌥`), `super` (`cmd`, `command`, `⌘`).

Simple shortcut mapping is done with the `map` directive. For full details on advanced mapping including modal and per application maps, see Making your keyboard dance. Some quick examples to illustrate common tasks:

    # unmap a keyboard shortcut, passing it to the program running in kitty
    map kitty_mod+space
    # completely ignore a keyboard event
    map ctrl+alt+f1 discard_event
    # combine multiple actions
    map kitty_mod+e combine : new_window : next_layout
    # multi-key shortcuts
    map ctrl+x>ctrl+y>z action

You can browse and trigger these actions by pressing `ctrl+shift+f3` to run the command palette. The full list of actions that can be mapped to key presses is available here.

kitty_mod

    kitty_mod ctrl+shift

Special modifier key alias for default shortcuts. You can change the value of this option to alter all default shortcuts that use `kitty_mod`.

clear_all_shortcuts

    clear_all_shortcuts no

Remove all shortcut definitions up to this point. Useful, for instance, to remove the default shortcuts.

map_timeout

    map_timeout 0.0

The default timeout (in seconds) for multi-key mappings and modal keyboard modes. If you press the first key(s) of a multi-key mapping and don’t press the next key within this timeout, the mapping is cancelled and the mode is exited. A value of zero disables the timeout. This can be overridden for specific modes using the `--timeout` option when creating a keyboard mode with `--new-mode`. For example:

    # 2 second timeout for all mappings
    map_timeout 2.0

    # This mode will have a 5 second timeout (overrides the global 2 second timeout)
    map --new-mode resize --timeout 5.0 kitty_mod+r

action_alias

Has no default values. Example values are shown below:

    action_alias launch_tab launch --type=tab --cwd=current

Define action aliases to avoid repeating the same options in multiple mappings. Aliases can be defined for any action and will be expanded recursively. For example, the above alias allows you to create mappings to launch a new tab in the current working directory without duplication:

    map f1 launch_tab vim
    map f2 launch_tab emacs

Similarly, to alias kitten invocation:

    action_alias hints kitten hints --hints-offset=0

kitten_alias

Has no default values. Example values are shown below:

    kitten_alias hints hints --hints-offset=0

Like `action_alias` above, but specifically for kittens. Generally, prefer to use `action_alias`. This option is a legacy version, present for backwards compatibility. It causes all invocations of the aliased kitten to be substituted. So the example above will cause all invocations of the hints kitten to have the `--hints-offset=0` option applied.

### Clipboard

Copy to clipboard

    map ctrl+shift+c copy_to_clipboard

There is also a `copy_or_interrupt` action that can be optionally mapped to `Ctrl`+`C`. It will copy only if there is a selection and send an interrupt otherwise. Similarly, `copy_and_clear_or_interrupt` will copy and clear the selection or send an interrupt if there is no selection. The `copy_or_noop` action will copy if there is a selection and pass the key through to the application running in the terminal if there is no selection.

Copy to clipboard or pass through

    map cmd+c copy_or_noop 🍎

Paste from clipboard

    map ctrl+shift+v paste_from_clipboard
    map cmd+v paste_from_clipboard 🍎

Paste from selection

    map ctrl+shift+s paste_from_selection
    map shift+insert paste_from_selection

Pass selection to program

    map ctrl+shift+o pass_selection_to_program

You can also pass the contents of the current selection to any program with `pass_selection_to_program`. By default, the system’s open program is used, but you can specify your own, the selection will be passed as a command line argument to the program. For example:

    map kitty_mod+o pass_selection_to_program firefox

You can pass the current selection to a terminal program running in a new kitty window, by using the `@selection` placeholder:

    map kitty_mod+y new_window less @selection

### Scrolling

Scroll line up

    map ctrl+shift+up scroll_line_up
    map ctrl+shift+k scroll_line_up
    map opt+cmd+page_up scroll_line_up 🍎
    map cmd+up scroll_line_up 🍎

Scroll line down

    map ctrl+shift+down scroll_line_down
    map ctrl+shift+j scroll_line_down
    map opt+cmd+page_down scroll_line_down 🍎
    map cmd+down scroll_line_down 🍎

Scroll page up

    map ctrl+shift+page_up scroll_page_up
    map cmd+page_up scroll_page_up 🍎

Scroll page down

    map ctrl+shift+page_down scroll_page_down
    map cmd+page_down scroll_page_down 🍎

Scroll to top

    map ctrl+shift+home scroll_home
    map cmd+home scroll_home 🍎

Scroll to bottom

    map ctrl+shift+end scroll_end
    map cmd+end scroll_end 🍎

Scroll to previous shell prompt

    map ctrl+shift+z scroll_to_prompt -1

Use a parameter of `0` for `scroll_to_prompt` to scroll to the last jumped to or the last clicked position. Requires shell integration to work.

Scroll to next shell prompt

    map ctrl+shift+x scroll_to_prompt 1

Browse scrollback buffer in pager

    map ctrl+shift+h show_scrollback

You can pipe the contents of the current screen and history buffer as `STDIN` to an arbitrary program using `launch --stdin-source`. For example, the following opens the scrollback buffer in less in an overlay window:

    map f1 launch --stdin-source=@screen_scrollback --stdin-add-formatting --type=overlay less +G -R

For more details on piping screen and buffer contents to external programs, see The launch command.

Browse output of the last shell command in pager

    map ctrl+shift+g show_last_command_output

You can also define additional shortcuts to get the command output. For example, to get the first command output on screen:

    map f1 show_first_command_output_on_screen

To get the command output that was last accessed by a keyboard action or mouse action:

    map f1 show_last_visited_command_output

You can pipe the output of the last command run in the shell using the `launch` action. For example, the following opens the output in less in an overlay window:

    map f1 launch --stdin-source=@last_cmd_output --stdin-add-formatting --type=overlay less +G -R

To get the output of the first command on the screen, use `@first_cmd_output_on_screen`. To get the output of the last jumped to command, use `@last_visited_cmd_output`.

Requires shell integration to work.

Search the scrollback within a pager

    map ctrl+shift+/ search_scrollback
    map cmd+f search_scrollback 🍎

Search for currently selected text in the scrollback using the configured `scrollback_pager`. Assumes that pressing the `/` key triggers search mode in the pager. If you want to create a manual mapping with a special pager for this, you can use something like:

> map f1 combine : launch --stdin-source=@screen_scrollback --stdin-add-formatting --type=overlay mypager : send_key /

For more sophisticated control, such as using the current selection, use `remote_control_script`.

### Window management

New window

    map ctrl+shift+enter new_window
    map cmd+enter new_window 🍎

You can open a new kitty window running an arbitrary program, for example:

    map kitty_mod+y launch mutt

You can open a new window with the current working directory set to the working directory of the current window using:

    map ctrl+alt+enter launch --cwd=current

You can open a new window that is allowed to control kitty via the kitty remote control facility with `launch --allow-remote-control`. Any programs running in that window will be allowed to control kitty. For example:

    map ctrl+enter launch --allow-remote-control some_program

You can open a new window next to the currently active window or as the first window, with:

    map ctrl+n launch --location=neighbor
    map ctrl+f launch --location=first

For more details, see The launch command.

New OS window

    map ctrl+shift+n new_os_window
    map cmd+n new_os_window 🍎

Works like `new_window` above, except that it opens a top-level OS window. In particular you can use `new_os_window_with_cwd` to open a window with the current working directory.

Close window

    map ctrl+shift+w close_window
    map shift+cmd+d close_window 🍎

Next window

    map ctrl+shift+] next_window

Previous window

    map ctrl+shift+[ previous_window

Move window forward

    map ctrl+shift+f move_window_forward

Move window backward

    map ctrl+shift+b move_window_backward

Move window to top

    map ctrl+shift+` move_window_to_top

Start resizing window

    map ctrl+shift+r start_resizing_window
    map cmd+r start_resizing_window 🍎

First window

    map ctrl+shift+1 first_window
    map cmd+1 first_window 🍎

Second window

    map ctrl+shift+2 second_window
    map cmd+2 second_window 🍎

Third window

    map ctrl+shift+3 third_window
    map cmd+3 third_window 🍎

Fourth window

    map ctrl+shift+4 fourth_window
    map cmd+4 fourth_window 🍎

Fifth window

    map ctrl+shift+5 fifth_window
    map cmd+5 fifth_window 🍎

Sixth window

    map ctrl+shift+6 sixth_window
    map cmd+6 sixth_window 🍎

Seventh window

    map ctrl+shift+7 seventh_window
    map cmd+7 seventh_window 🍎

Eighth window

    map ctrl+shift+8 eighth_window
    map cmd+8 eighth_window 🍎

Ninth window

    map ctrl+shift+9 ninth_window
    map cmd+9 ninth_window 🍎

Tenth window

    map ctrl+shift+0 tenth_window

Visually select and focus window

    map ctrl+shift+f7 focus_visible_window

Display overlay numbers and alphabets on the window, and switch the focus to the window when you press the key. When there are only two windows, the focus will be switched directly without displaying the overlay. You can change the overlay characters and their order with option `visual_window_select_characters`.

Visually swap window with another

    map ctrl+shift+f8 swap_with_window

Works like `focus_visible_window` above, but swaps the window.

### Tab management

Next tab

    map ctrl+shift+right next_tab
    map shift+cmd+] next_tab 🍎
    map ctrl+tab next_tab

Previous tab

    map ctrl+shift+left previous_tab
    map shift+cmd+[ previous_tab 🍎
    map ctrl+shift+tab previous_tab

New tab

    map ctrl+shift+t new_tab
    map cmd+t new_tab 🍎

Close tab

    map ctrl+shift+q close_tab
    map cmd+w close_tab 🍎

Close OS window

    map shift+cmd+w close_os_window 🍎

Move tab forward

    map ctrl+shift+. move_tab_forward

Move tab backward

    map ctrl+shift+, move_tab_backward

Set tab title

    map ctrl+shift+alt+t set_tab_title
    map shift+cmd+i set_tab_title 🍎

You can also create shortcuts to go to specific tabs, with `1` being the first tab, `2` the second tab and `-1` being the previously active tab, `-2` being the tab active before the previously active tab and so on. Any number larger than the number of tabs goes to the last tab and any number less than the number of previously used tabs in the history goes to the oldest previously used tab in the history:

    map ctrl+alt+1 goto_tab 1
    map ctrl+alt+2 goto_tab 2

Just as with `new_window` above, you can also pass the name of arbitrary commands to run when using `new_tab` and `new_tab_with_cwd`. Finally, if you want the new tab to open next to the current tab rather than at the end of the tabs list, use:

    map ctrl+t new_tab !neighbor [optional cmd to run]

### Layout management

Next layout

    map ctrl+shift+l next_layout

You can also create shortcuts to switch to specific layouts:

    map ctrl+alt+t goto_layout tall
    map ctrl+alt+s goto_layout stack

Similarly, to switch back to the previous layout:

    map ctrl+alt+p last_used_layout

There is also a `toggle_layout` action that switches to the named layout or back to the previous layout if in the named layout. Useful to temporarily “zoom” the active window by switching to the stack layout:

    map ctrl+alt+z toggle_layout stack

### Font sizes

You can change the font size for all top-level kitty OS windows at a time or only the current one.

Increase font size

    map ctrl+shift+equal change_font_size all +2.0
    map ctrl+shift+plus change_font_size all +2.0
    map ctrl+shift+kp_add change_font_size all +2.0
    map cmd+plus change_font_size all +2.0 🍎
    map cmd+equal change_font_size all +2.0 🍎
    map shift+cmd+equal change_font_size all +2.0 🍎

Decrease font size

    map ctrl+shift+minus change_font_size all -2.0
    map ctrl+shift+kp_subtract change_font_size all -2.0
    map cmd+minus change_font_size all -2.0 🍎
    map shift+cmd+minus change_font_size all -2.0 🍎

Reset font size

    map ctrl+shift+backspace change_font_size all 0
    map cmd+0 change_font_size all 0 🍎

To setup shortcuts for specific font sizes:

    map kitty_mod+f6 change_font_size all 10.0

To setup shortcuts to change only the current OS window’s font size:

    map kitty_mod+f6 change_font_size current 10.0

To setup shortcuts to multiply/divide the font size:

    map kitty_mod+f6 change_font_size all *2.0
    map kitty_mod+f6 change_font_size all /2.0

### Select and act on visible text

Use the hints kitten to select text and either pass it to an external program or insert it into the terminal or copy it to the clipboard.

Open URL

    map ctrl+shift+e open_url_with_hints

Open a currently visible URL using the keyboard. The program used to open the URL is specified in `open_url_with`.

Insert selected path

    map ctrl+shift+p>f kitten hints --type path --program -

Select a path/filename and insert it into the terminal. Useful, for instance to run git commands on a filename output from a previous git command.

Open selected path

    map ctrl+shift+p>shift+f kitten hints --type path

Select a path/filename and open it with the default open program.

Insert chosen file

    map ctrl+shift+p>c kitten choose-files

Select a file using the choose-files kitten and insert it into the terminal.

Insert chosen directory

    map ctrl+shift+p>d kitten choose-files --mode=dir

Select a directory using the choose-files kitten and insert it into the terminal.

Insert selected line

    map ctrl+shift+p>l kitten hints --type line --program -

Select a line of text and insert it into the terminal. Useful for the output of things like: `ls -1`.

Insert selected word

    map ctrl+shift+p>w kitten hints --type word --program -

Select words and insert into terminal.

Insert selected hash

    map ctrl+shift+p>h kitten hints --type hash --program -

Select something that looks like a hash and insert it into the terminal. Useful with git, which uses SHA1 hashes to identify commits.

Open the selected file at the selected line

    map ctrl+shift+p>n kitten hints --type linenum

Select something that looks like `filename:linenum` and open it in your default editor at the specified line number.

Open the selected hyperlink

    map ctrl+shift+p>y kitten hints --type hyperlink

Select a hyperlink (i.e. a URL that has been marked as such by the terminal program, for example, by `ls --hyperlink=auto`).

The hints kitten has many more modes of operation that you can map to different shortcuts. For a full description see hints kitten.

### Miscellaneous

Show documentation

    map ctrl+shift+f1 show_kitty_doc overview

Command palette

    map ctrl+shift+f3 command_palette

Toggle fullscreen

    map ctrl+shift+f11 toggle_fullscreen
    map ctrl+cmd+f toggle_fullscreen 🍎

Toggle maximized

    map ctrl+shift+f10 toggle_maximized

Toggle macOS secure keyboard entry

    map opt+cmd+s toggle_macos_secure_keyboard_entry 🍎

macOS Cycle through OS Windows

    map cmd+` macos_cycle_through_os_windows 🍎

macOS Cycle through OS Windows backwards

    map cmd+shift+` macos_cycle_through_os_windows_backwards 🍎

Unicode input

    map ctrl+shift+u kitten unicode_input
    map ctrl+cmd+space kitten unicode_input 🍎

Edit config file

    map ctrl+shift+f2 edit_config_file
    map cmd+, edit_config_file 🍎

Open the kitty command shell

    map ctrl+shift+escape kitty_shell window

Open the kitty shell in a new `window` / `tab` / `overlay` / `os_window` to control kitty using commands.

Increase background opacity

    map ctrl+shift+a>m set_background_opacity +0.1

Decrease background opacity

    map ctrl+shift+a>l set_background_opacity -0.1

Make background fully opaque

    map ctrl+shift+a>1 set_background_opacity 1

Reset background opacity

    map ctrl+shift+a>d set_background_opacity default

Reset the terminal

    map ctrl+shift+delete clear_terminal reset active
    map opt+cmd+r clear_terminal reset active 🍎

You can create shortcuts to clear/reset the terminal. For example:

    # Reset the terminal
    map f1 clear_terminal reset active
    # Clear the terminal screen by erasing all contents
    map f1 clear_terminal clear active
    # Clear the terminal scrollback by erasing it
    map f1 clear_terminal scrollback active
    # Scroll the contents of the screen into the scrollback
    map f1 clear_terminal scroll active
    # Clear everything on screen up to the line with the cursor or the start of the current prompt (needs shell integration)
    map f1 clear_terminal to_cursor active
    # Same as above except cleared lines are moved into scrollback
    map f1 clear_terminal to_cursor_scroll active
    # Erase the last command and its output (needs shell integration to work)
    map f1 clear_terminal last_command active

If you want to operate on all kitty windows instead of just the current one, use all instead of active.

Some useful functions that can be defined in the shell rc files to perform various kinds of clearing of the current window:

    clear-only-screen() {
        printf "\e[H\e[2J"
    }

    clear-screen-and-scrollback() {
        printf "\e[H\e[3J"
    }

    clear-screen-saving-contents-in-scrollback() {
        printf "\e[H\e[22J"
    }

For instance, using these escape codes, it is possible to remap `Ctrl`+`L` to both scroll the current screen contents into the scrollback buffer and clear the screen, instead of just clearing the screen. For ZSH, in `~/.zshrc`, add:

    ctrl_l() {
        builtin print -rn -- $'\r\e[0J\e[H\e[22J' >"$TTY"
        builtin zle .reset-prompt
        builtin zle -R
    }
    zle -N ctrl_l
    bindkey '^l' ctrl_l

Alternatively, you can just add `map ctrl+l clear_terminal to_cursor_scroll active` to `kitty.conf` which works with no changes to the shell rc files, but only clears up to the prompt, it does not clear any text at the prompt itself.

Clear to start

    map cmd+k clear_terminal to_cursor active 🍎

Clear scrollback

    map option+cmd+k clear_terminal scrollback active 🍎

Clear the last command

    map cmd+l clear_terminal last_command active 🍎

Clear screen

    map cmd+ctrl+l clear_terminal to_cursor_scroll active 🍎

Reload kitty.conf

    map ctrl+shift+f5 load_config_file
    map ctrl+cmd+, load_config_file 🍎

Reload `kitty.conf`, applying any changes since the last time it was loaded. Note that a handful of options cannot be dynamically changed and require a full restart of kitty. Particularly, when changing shortcuts for actions located on the macOS global menu bar, a full restart is needed. You can also map a keybinding to load a different config file, for example:

    map f5 load_config /path/to/alternative/kitty.conf

Note that all options from the original `kitty.conf` are discarded, in other words the new configuration replace the old ones.

Debug kitty configuration

    map ctrl+shift+f6 debug_config
    map opt+cmd+, debug_config 🍎

Show details about exactly what configuration kitty is running with and its host environment. Useful for debugging issues.

Send arbitrary text on key presses

You can tell kitty to send arbitrary (UTF-8) encoded text to the client program when pressing specified shortcut keys. For example:

    map ctrl+alt+a send_text all Special text

This will send “Special text” when you press the `Ctrl`+`Alt`+`A` key combination. The text to be sent decodes ANSI C escapes so you can use escapes like `\e` to send control codes or `\u21fb` to send Unicode characters (or you can just input the Unicode characters directly as UTF-8 text). You can use `kitten show-key` to get the key escape codes you want to emulate.

The first argument to `send_text` is the keyboard modes in which to activate the shortcut. The possible values are `normal`, `application`, `kitty` or a comma separated combination of them. The modes `normal` and `application` refer to the DECCKM cursor key mode for terminals, and `kitty` refers to the kitty extended keyboard protocol. The special value `all` means all of them.

Some more examples:

    # Output a word and move the cursor to the start of the line (like typing and pressing Home)
    map ctrl+alt+a send_text normal Word\e[H
    map ctrl+alt+a send_text application Word\eOH
    # Run a command at a shell prompt (like typing the command and pressing Enter)
    map ctrl+alt+a send_text normal,application some command with arguments\r

Open kitty Website

    map shift+cmd+/ open_url https://sw.kovidgoyal.net/kitty/ 🍎

Hide macOS kitty application

    map cmd+h hide_macos_app 🍎

Hide macOS other applications

    map opt+cmd+h hide_macos_other_apps 🍎

Minimize macOS window

    map cmd+m minimize_macos_window 🍎

Quit kitty

    map cmd+q quit 🍎

## Sample kitty.conf

You can download a sample `kitty.conf` file with all default settings and comments describing each setting by clicking: `sample kitty.conf`.

A default configuration file can also be generated by running:

    kitty +runpy 'from kitty.config import *; print(commented_out_default_config())'

This will print the commented out default config file to `STDOUT`.

## All mappable actions

See the list of all the things you can make |kitty| can do.