Provided by: kitty_0.21.2-1ubuntu0.22.04.1_amd64 
NAME
kitty.conf - kitty.conf Documentation
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. You can reload the config file
within kitty by pressing ctrl+shift+f5 or sending kitty the SIGUSR1 signal. You can also display the
current configuration by pressing the ctrl+shift+f6 key.
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 the kitty --config option 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.
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. For example:
include other.conf
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. To get a full list of
supported fonts use the kitty list-fonts command. By default they are derived automatically, by the OSes
font system. Setting them manually is useful for font families that have many weight variants like Book,
Medium, Thick, etc. For example:
font_family Operator Mono Book
bold_font Operator Mono Medium
italic_font Operator Mono Book Italic
bold_italic_font Operator Mono Medium Italic
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 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.
adjust_line_height, adjust_column_width
adjust_line_height 0
adjust_column_width 0
Change the size of each character cell kitty renders. You can use either numbers, which are interpreted
as pixels or percentages (number followed by %), which are interpreted as percentages of the unmodified
values. You can use negative pixels or percentages less than 100% to reduce sizes (but this might cause
rendering artifacts).
adjust_baseline
adjust_baseline 0
Adjust the vertical alignment of text (the height in the cell at which text is positioned). You can use
either numbers, which are interpreted as pixels or a percentages (number followed by %), which are
interpreted as the percentage of the line height. A positive value moves the baseline up, and a negative
value moves them down. The underline and strikethrough positions are adjusted accordingly.
symbol_map
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. symbol_map itself can be specified multiple times. Syntax is:
symbol_map codepoints Font Family Name
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 setting.
font_features
font_features none
Choose exactly which OpenType features to enable or disable. This is useful as some fonts might have
features worthwhile in a terminal. For example, Fira Code Retina 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 Retina 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, these are read from the FontConfig database first and then this, setting is applied, so they
can be configured in a single, central place.
To get the PostScript name for a font, use kitty + list-fonts --psnames:
$ kitty + list-fonts --psnames | grep Fira
Fira Code
Fira Code Bold (FiraCode-Bold)
Fira Code Light (FiraCode-Light)
Fira Code Medium (FiraCode-Medium)
Fira Code Regular (FiraCode-Regular)
Fira Code Retina (FiraCode-Retina)
The part in brackets is the PostScript name.
Enable alternate zero and oldstyle numerals:
font_features FiraCode-Retina +zero +onum
Enable only alternate zero:
font_features FiraCode-Retina +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
box_drawing_scale
box_drawing_scale 0.001, 1, 1.5, 2
Change 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.
CURSOR CUSTOMIZATION
cursor
cursor #cccccc
Default cursor color
cursor_text_color
cursor_text_color #111111
Choose 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
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.
cursor_beam_thickness
cursor_beam_thickness 1.5
Defines the thickness of the beam cursor (in pts)
cursor_underline_thickness
cursor_underline_thickness 2.0
Defines the thickness of the underline cursor (in pts)
cursor_blink_interval
cursor_blink_interval -1
The interval (in seconds) at which to blink the cursor. Set to zero to disable blinking. Negative values
mean use system default. Note that numbers smaller than repaint_delay will be limited to repaint_delay.
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.
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.
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.
scrollback_pager_history_size
scrollback_pager_history_size 0
Separate scrollback history size, used only for browsing the scrollback buffer (in MB). 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
approximatively 10000 lines per megabyte at 100 chars per line, for pure ASCII text, 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
Modify the amount scrolled by the mouse wheel. Note this is only used for low precision scrolling
devices, not for high precision scrolling on platforms such as macOS and Wayland. Use negative numbers to
change scroll direction.
touch_scroll_multiplier
touch_scroll_multiplier 1.0
Modify the amount scrolled by a touchpad. Note this is only used for high precision scrolling devices on
platforms such as macOS and Wayland. Use negative numbers to change scroll direction.
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.
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, single, double,
curly
open_url_with
open_url_with default
The program with which to open URLs that are clicked on. The special value default means to use the
operating system's default URL handler.
url_prefixes
url_prefixes http https file ftp gemini irc gopher mailto news git
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.
url_excluded_characters
url_excluded_characters
Additional characters to be disallowed from URLs, when detecting URLs under the mouse cursor. By default,
all characters legal in URLs are allowed.
copy_on_select
copy_on_select no
Copy to clipboard or a private buffer on select. With this set to clipboard, simply 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 selections. You can instead specify a name such as a1 to copy to a private
kitty buffer instead. Map a shortcut with the paste_from_buffer action to paste from this private buffer.
For example:
map cmd+shift+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.
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. 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.
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
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. Valid values
are: arrow, beam and hand
default_pointer_shape
default_pointer_shape beam
The default shape of the mouse pointer. Valid values are: arrow, beam and hand
pointer_shape_when_dragging
pointer_shape_when_dragging beam
The default shape of the mouse pointer when dragging across text. Valid values are: arrow, beam and hand
Mouse actions
Mouse buttons can be remapped to perform arbitrary actions. The syntax for doing so is:
mouse_map button-name event-type modes action
Where button-name is one of left, middle, right or 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
number b1 ... b8 can be used to refer to upto eight buttons on a mouse.
event-type is one press, release, doublepress, triplepress, click and doubleclick. modes indicates
whether the action is performed when the mouse is grabbed by the program running in the terminal, or not.
It can have one or more or the values, grabbed,ungrabbed. 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 an action map it to no-op. For example, to disable opening of URLs with a plain
click:
mouse_map left click ungrabbed no-op
NOTE:
Once a selection is started, releasing the button that started it will automatically end it and no
release event will be dispatched.
Click the link under the mouse cursor when no selection is created
mouse_map left click ungrabbed mouse_click_url_or_select
Click the link under the mouse cursor when no selection is created even if grabbed
mouse_map shift+left click grabbed,ungrabbed mouse_click_url_or_select
Click the link under the mouse cursor
mouse_map ctrl+shift+left release grabbed,ungrabbed mouse_click_url
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 the entire 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
Extend the current selection
mouse_map right press ungrabbed mouse_selection extend
Paste from the primary selection even when grabbed
mouse_map shift+middle release ungrabbed,grabbed paste_selection
Start selecting text even when grabbed
mouse_map shift+left press ungrabbed,grabbed mouse_selection normal
Start selecting text in a rectangle even when grabbed
mouse_map shift+ctrl+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 the entire line
Select line from point even when grabbed
mouse_map shift+ctrl+alt+left triplepress ungrabbed,grabbed mouse_selection line_from_point
Select from the clicked point to the end of the line
Extend the current selection even when grabbed
mouse_map shift+right press ungrabbed,grabbed mouse_selection extend
PERFORMANCE TUNING
repaint_delay
repaint_delay 10
Delay (in milliseconds) between screen updates. 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, repaint_delay
is ignored.
input_delay
input_delay 3
Delay (in milliseconds) before input from the program running in the terminal is processed. 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.
sync_to_monitor
sync_to_monitor yes
Sync screen updates to the refresh rate of the monitor. This prevents tearing (‐
https://en.wikipedia.org/wiki/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
Enable/disable the audio bell. Useful in environments that require silence.
visual_bell_duration
visual_bell_duration 0.0
Visual bell duration. Flash the screen when a bell occurs for the specified number of seconds. Set to
zero to disable.
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 yes
Show a bell symbol on the tab if a bell occurs in one of the windows in the tab and the window is not the
currently focused window
command_on_bell
command_on_bell none
Program to run when a bell occurs.
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 window size will be remembered so that new instances of kitty will have the same size as
the previous instance. If disabled, the 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.
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 windows. The cells value is used
for horizontal resizing and the lines value 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 minimum needed borders for inactive
windows are drawn. That is only the borders that separate the inactive window from a neighbor. Note that
setting a non-zero window margin overrides this and causes all borders to be drawn.
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 (in pts) to use when only a single window is visible. 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.
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 on only the bottom and right edges.
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 can be used
to only hide the titlebar. Whether this works and exactly what effect it has depends on the window
manager/operating system. Note that the effects of changing this setting when reloading config are
undefined.
resize_debounce_time
resize_debounce_time 0.1
The time (in seconds) to wait before redrawing the screen when a resize event is received. On platforms
such as macOS, where the operating system sends events corresponding to the start and end of a resize,
this number is ignored.
resize_draw_strategy
resize_draw_strategy static
Choose how kitty draws a window while a resize is in progress. A value of static means draw the current
window contents, mostly unchanged. A value of scale means draw the current window contents scaled. A
value of blank means draw a blank window. A value of size means show the window size in cells.
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 an 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.
confirm_os_window_close
confirm_os_window_close 0
Ask for confirmation when closing an OS window or a tab that has at least this number of kitty windows in
it. A value of zero disables confirmation. This confirmation also applies to requests to quit the entire
application (all OS windows, via the quit action).
TAB BAR
tab_bar_edge
tab_bar_edge bottom
Which 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 and 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, separator, powerline, or hidden. In the fade style, each tab's
edges fade into the background color, in the separator style, tabs are separated by a configurable
separator, and the powerline shows the tabs as a continuous line. If you use the hidden style, 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_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, or 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.
tab_title_template
tab_title_template "{title}"
A template to render the tab title. The default just renders the title. 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}. In addition you can use
{layout_name} for the current layout name and {num_windows} for the number of windows in the tab. 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.default}normal{fmt.bg._00FF00}green bg{fmt.bg.normal}. Similarly, for bold and
italic: {fmt.bold}bold{fmt.nobold}normal{fmt.italic}italic{fmt.noitalic}.
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.
COLOR SCHEME
foreground, background
foreground #dddddd
background #000000
The foreground and background colors
background_opacity
background_opacity 1.0
The opacity of the background. A number between 0 and 1, where 1 is opaque and 0 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. This is 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. Be aware that using a value less than
1.0 is a (possibly significant) performance hit. 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 setting when reloading the config will only work if dynamic_background_opacity was enabled
in the original config.
background_image
background_image none
Path to a background image. Must be in PNG format.
background_image_layout
background_image_layout tiled
Whether to tile or scale the background image.
background_image_linear
background_image_linear no
When background image is scaled, whether linear interpolation should be used.
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 setting by reloading the config is not
supported.
background_tint
background_tint 0.0
How much to tint the background image by the background color. The tint is applied only under the text
area, not margin/borders. Makes it easier to read the text. Tinting is done using the current background
color for each window. This setting applies only if background_opacity is set and transparent windows
are supported or background_image is set.
dim_opacity
dim_opacity 0.75
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_foreground #000000
The foreground for text selected with the mouse. A value of none means to leave the color unchanged.
selection_background
selection_background #fffacd
The background for text selected with the mouse.
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)
ADVANCED
shell
shell .
The shell program to execute. The default value of . means to use 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 to
ensure that the shell starts in interactive mode and reads its startup rc files.
editor
editor .
The console editor to use when editing the kitty config file or similar tasks. A value of . means to use
the environment variables VISUAL and EDITOR in that order. Note that this environment variable has to be
set not just in your shell startup scripts but system-wide, otherwise kitty will not see it.
close_on_child_death
close_on_child_death no
Close the window when the child process (shell) exits. If no (the default), the terminal will remain open
when the child exits as long as there are still processes outputting to the terminal (for example
disowned or backgrounded processes). If 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.
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. You can chose to either allow any
program running within kitty to control it, with yes or only programs that connect to the socket
specified with the kitty --listen-on command line option, if you use the value socket-only. The latter is
useful if you want to prevent programs running on a remote computer over ssh from controlling kitty.
Changing this option by reloading the config will only affect newly created windows.
listen_on
listen_on none
Tell kitty to listen to the specified unix/tcp 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 flag. This
option accepts only UNIX sockets, such as unix:${TEMP}/mykitty or (on Linux) unix:@mykitty. Environment
variables are expanded. If {kitty_pid} is present then it is replaced by the PID of the kitty process,
otherwise the PID of the kitty process is appended to the value, with a hyphen. This option is ignored
unless you also set allow_remote_control to enable remote control. See the help for kitty --listen-on for
more details. Changing this option by reloading the config is not supported.
env
env
Specify environment variables to set in all child processes. Note that environment variables are expanded
recursively, so if you use:
env MYVAR1=a
env MYVAR2=${MYVAR1}/${HOME}/b
The value of MYVAR2 will be a/<path to home directory>/b.
update_check_interval
update_check_interval 24
Periodically check if an update to kitty is available. If an update is found a system notification is
displayed informing you of the available update. The default is to check every 24 hrs, set to zero to
disable. 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
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.
clipboard_control
clipboard_control write-clipboard write-primary
Allow programs running in kitty to read and write from the clipboard. You can control exactly which
actions are allowed. The set of possible actions is: write-clipboard read-clipboard write-primary
read-primary. You can additionally specify no-append to disable kitty's protocol extension for clipboard
concatenation. The default is to allow writing to the clipboard and primary selection with concatenation
enabled. Note that enabling the read functionality is a security risk as it means that any program, even
one running on a remote server via SSH can read your clipboard.
allow_hyperlinks
allow_hyperlinks yes
Process hyperlink (OSC 8) escape sequences. If disabled OSC 8 escape sequences are ignored. Otherwise
they become clickable links, that you can click by holding down ctrl+shift and clicking with the mouse.
The special value of ask means that kitty will ask before opening the link.
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.
OS SPECIFIC TWEAKS
wayland_titlebar_color
wayland_titlebar_color system
Change 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 color, 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_titlebar_color
macos_titlebar_color system
Change the color of the kitty window's titlebar on macOS. A value of system means to use the default
system color, 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. WARNING: This option works by using a
hack, as there is no proper Cocoa API for it. It sets the background color of the entire window and makes
the titlebar transparent. As such it is incompatible with background_opacity. If you want to use both,
you are probably better off just hiding the titlebar with hide_window_decorations.
macos_option_as_alt
macos_option_as_alt no
Use the option key as an alt key. With this set to no, kitty will use the macOS native Option+Key =
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. Changing this setting by reloading the config is not
supported.
macos_hide_from_tasks
macos_hide_from_tasks no
Hide the kitty window from running tasks (⌘+Tab) on macOS. Changing this setting 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. 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. Changing this setting
by reloading the config will only affect newly created windows.
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.
For example, a value of 0.75 will result in rendering that looks similar to sub-pixel antialiasing at
common font sizes.
macos_traditional_fullscreen
macos_traditional_fullscreen no
Use the traditional full-screen transition, that is faster, but less pretty.
macos_show_window_title_in
macos_show_window_title_in all
Show or hide the window title in the macOS window or menu-bar. 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 menu-bar, making use of otherwise wasted space. all will show the
title everywhere and none hides the title in the window and the menu-bar.
macos_custom_beam_cursor
macos_custom_beam_cursor no
Enable/disable custom mouse cursor for macOS that is easier to see on both light and dark backgrounds.
WARNING: this might make your mouse cursor invisible on dual GPU machines. Changing this setting by
reloading the config is not supported.
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 setting by reloading
the config is not supported.
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. For a list of modifier names, see: GLFW mods
On Linux you can also use XKB key names to bind keys that are not supported by GLFW. See XKB keys for a
list of key names. The name to use is the part after the XKB_KEY_ prefix. Note that you can only use an
XKB key name for keys that are not known as GLFW keys.
Finally, you can use raw system key codes to map keys, again only for keys that are not known as GLFW
keys. To see the system key code for a key, start kitty with the kitty --debug-input option. Then kitty
will output some debug text for every key event. In that text look for native_code the value of that
becomes the key name in the shortcut. For example:
on_key_input: glfw key: 65 native_code: 0x61 action: PRESS mods: 0x0 text: 'a'
Here, the key name for the A key is 0x61 and you can use it with:
map ctrl+0x61 something
to map ctrl+a to something.
You can use the special action no_op to unmap a keyboard shortcut that is assigned in the default
configuration:
map kitty_mod+space no_op
You can combine multiple actions to be triggered by a single shortcut, using the syntax below:
map key combine <separator> action1 <separator> action2 <separator> action3 ...
For example:
map kitty_mod+e combine : new_window : next_layout
this will create a new window and switch to the next available layout
You can use multi-key shortcuts using the syntax shown below:
map key1>key2>key3 action
For example:
map ctrl+f>2 set_font_size 20
kitty_mod
kitty_mod ctrl+shift
The value of kitty_mod is used as the modifier for all default shortcuts, you can change it in your
kitty.conf to change the modifiers for all the default shortcuts.
clear_all_shortcuts
clear_all_shortcuts no
You can have kitty remove all shortcut definition seen up to this point. Useful, for instance, to remove
the default shortcuts.
kitten_alias
kitten_alias hints hints --hints-offset=0
You can create aliases for kitten names, this allows overriding the defaults for kitten options and can
also be used to shorten repeated mappings of the same kitten with a specific group of options. For
example, the above alias changes the default value of kitty +kitten hints --hints-offset to zero for all
mappings, including the builtin ones.
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.
Paste from clipboard
map ctrl+shift+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 using 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 alt+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 alt+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 🍎
Browse scrollback buffer in less
map ctrl+shift+h show_scrollback
You can pipe the contents of the current screen + history buffer as STDIN to an arbitrary program using
the launch function. 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 launch.
Window management
New window
map ctrl+shift+enter new_window
map cmd+enter new_window 🍎
You can open a new 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 by
prefixing the command line with @. 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 some_program
map ctrl+f launch --location=first some_program
For more details, see launch.
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 kitty 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 🍎
Eight 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
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 shift+ctrl+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, and any number larger than the last tab being the last tab:
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 use 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
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 cmd+shift+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 cmd+shift+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
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 kitten 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 selected line
map ctrl+shift+p>l kitten hints --type line --program -
Select a line of text and insert it into the terminal. Use 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 vim 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 kittens/hints.
Miscellaneous
Toggle fullscreen
map ctrl+shift+f11 toggle_fullscreen
Toggle maximized
map ctrl+shift+f10 toggle_maximized
Unicode input
map ctrl+shift+u kitten unicode_input
map cmd+ctrl+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 cmd+option+r clear_terminal reset active 🍎
You can create shortcuts to clear/reset the terminal. For example:
# Reset the terminal
map kitty_mod+f9 clear_terminal reset active
# Clear the terminal screen by erasing all contents
map kitty_mod+f10 clear_terminal clear active
# Clear the terminal scrollback by erasing it
map kitty_mod+f11 clear_terminal scrollback active
# Scroll the contents of the screen into the scrollback
map kitty_mod+f12 clear_terminal scroll active
If you want to operate on all windows instead of just the current one, use all instead of active.
It is also 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 example, for ZSH add the following to
~/.zshrc:
scroll-and-clear-screen() {
printf '\n%.0s' {1..$LINES}
zle clear-screen
}
zle -N scroll-and-clear-screen
bindkey '^l' scroll-and-clear-screen
Reload kitty.conf
map ctrl+shift+f5 load_config_file
map cmd+control+, load_config_file 🍎
Reload kitty.conf, applying any changes since the last time it was loaded. Note that a handful of
settings cannot be dynamically changed and require a full restart of kitty. 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 setting from the original kitty.conf are discarded, in other words the new conf settings
replace the old ones.
Debug kitty configuration
map ctrl+shift+f6 debug_config
map cmd+option+, 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 is a
python string literal so you can use escapes like \x1b to send control codes or \u21fb to send unicode
characters (or you can just input the unicode characters directly as UTF-8 text). The first argument to
send_text is the keyboard modes in which to activate the shortcut. The possible values are normal or
application or kitty or a comma separated combination of them. The special keyword all means all modes.
The modes normal and application refer to the DECCKM cursor key mode for terminals, and kitty refers to
the special kitty extended keyboard protocol.
Another example, that outputs a word and then moves the cursor to the start of the line (same as pressing
the Home key):
map ctrl+alt+a send_text normal Word\x1b[H
map ctrl+alt+a send_text application Word\x1bOH
SAMPLE KITTY.CONF
You can edit a fully commented sample kitty.conf by pressing the ctrl+shift+f2 shortcut in kitty. This
will generate a config file with full documentation and all settings commented out. If you have a
pre-existing kitty.conf, then that will be used instead, delete it to see the sample file.
AUTHOR
Kovid Goyal
COPYRIGHT
2022, Kovid Goyal