The configuration is divided into the following categories:

  • Options

  • Keys

The configuration is stored in the JSON format in a file located at ~/.term_image/config.json.

Config Options

These are fields whose values control various behaviours of the viewer.
Any option with a “[*]” after its description will be used only when the corresponding command-line option is either not specified or has an invalid value.

They are as follows:

anim cache

The maximum frame count of an image for which frames will be cached during animation. [*]

  • Type: integer

  • Valid values: x > 0

cell width

The initial width of (no of columns for) grid cells, in the TUI.

  • Type: integer

  • Valid values: 30 <= x <= 50 and x is even


Maximum number of subprocesses for checking directory sources.

  • Type: null or integer

  • Valid values: null or x >= 0

If null, the number of subprocesses is automatically determined based on the amount of logical processors available. CPU affinity is also taken into account on supported platforms.
If 0 (zero), directory sources are checked within the main process.
font ratio

The font ratio. [*]

  • Type: null or float

  • Valid values: null or x > 0.0

If null, the ratio is determined from the active terminal such that the aspect ratio of any image is always preserved. If this is not supported in the active terminal or on the platform, 0.5 is used instead.


Number of threads for downloading images from URL sources.

  • Type: integer

  • Valid values: x > 0

grid renderers

Number of subprocesses for rendering grid cells.

  • Type: integer

  • Valid values: x > 0

If 0 (zero), grid cells are rendered by a thread of the main process.
log file

The file to which logs are written. [*]

  • Type: string

  • Valid values: An absolute path to a writable file.

If the file doesn’t exist the parent directory must be writable, so the file can created.
If the file exists, it is appended to, not overwritten.
See Logging.
max notifications

The maximum number of TUI notifications that can show at a time.

  • Type: integer

  • Valid values: x >= 0

Adjusts the height of the notification bar.
max pixels

The maximum amount of pixels in images to be displayed in the TUI. [*]

  • Type: integer

  • Valid values: x > 0

Any image having more pixels than the specified value will be:

  • skipped, in CLI mode, if --max-pixels-cli is specified.

  • replaced, in TUI mode, with a placeholder when displayed but can still be forced to display or viewed externally.

Note that increasing this should not have any effect on general performance (i.e navigation, etc) but the larger an image is, the more the time and memory it’ll take to render it. Thus, a large image might delay the rendering of other images to be rendered immediately after it.

no multi

Enables or disables multiprocessing.

  • Type: boolean

  • Valid values: true, false

If true and not overriden by a command-line option, checkers and grid renderers options have no effect.

query timeout

Timeout (in seconds) for all Terminal Queries.

  • Type: float

  • Valid values: x > 0.0


Image render style. See Render Styles.

  • Type: string

  • Valid values: "auto", "block", "iterm2", "kitty"

If set to any value other than "auto" and is not overriden by the -S | --style command-line option, the style is used regardless of whether it’s supported or not.

swap win size

A workaround for some terminal emulators (e.g older VTE-based ones) that wrongly report window dimensions swapped.

  • Type: boolean

  • Valid values: true, false

If true, the dimensions reported by the terminal emulator are swapped.
This setting affects auto Font Ratio computation.


The version field is not a config option, it’s used for config file updates and should not be tampered with.

Key Config

The key assigned to every action can be modified in the config file.

The "keys" field in the configuration holds a mapping containing fields each mapping a context to a mapping of actions to their properties.

The format of the "keys" mapping is thus:

   "<context>": {
      "<action>": [



‘…’ means continuous repitition of the format occurs.

action is the name of the action. It should not be modified.
Any or both of key and symbol can be changed. Both must be valid Python strings, hence Unicode characters are supported.


If using a Unicode character that occupies multiple columns in symbol, then add spaces after it as required to cover-up for the extra columns.


The navigation field is not actually a context, instead it’s the universal navigation controls configuration from which navigation actions in actual contexts are updated.


  1. Keys used in navigation or global contexts cannot be used in any other context.

  2. All keys in a context must be unique.

  3. If a key is invalid or already used, the default is tried as a fallback but if that fails (because it’s already used), the session is terminated.

Here is a config with Vim-style (majorly navigation) keybindings.
Remember to rename the file to config.json.

Below is a list of all valid values for key:

" "
"ctrl a"
"ctrl b"
"ctrl d"
"ctrl e"
"ctrl f"
"ctrl g"
"ctrl h"
"ctrl i"
"ctrl j"
"ctrl k"
"ctrl l"
"ctrl m"
"ctrl n"
"ctrl o"
"ctrl p"
"ctrl q"
"ctrl r"
"ctrl s"
"ctrl t"
"ctrl u"
"ctrl v"
"ctrl w"
"ctrl x"
"ctrl y"
"ctrl f1"
"shift f1"
"shift ctrl f1"
"ctrl f2"
"shift f2"
"shift ctrl f2"
"ctrl f3"
"shift f3"
"shift ctrl f3"
"ctrl f4"
"shift f4"
"shift ctrl f4"
"ctrl f5"
"shift f5"
"shift ctrl f5"
"ctrl f6"
"shift f6"
"shift ctrl f6"
"ctrl f7"
"shift f7"
"shift ctrl f7"
"ctrl f8"
"shift f8"
"shift ctrl f8"
"ctrl f9"
"shift f9"
"shift ctrl f9"
"ctrl up"
"shift up"
"shift ctrl up"
"ctrl end"
"shift end"
"shift ctrl end"
"ctrl f10"
"shift f10"
"shift ctrl f10"
"ctrl f11"
"shift f11"
"shift ctrl f11"
"ctrl f12"
"shift f12"
"shift ctrl f12"
"ctrl down"
"shift down"
"shift ctrl down"
"ctrl home"
"shift home"
"shift ctrl home"
"ctrl left"
"shift left"
"shift ctrl left"
"ctrl right"
"shift right"
"shift ctrl right"
"ctrl delete"
"shift delete"
"shift ctrl delete"
"page up"
"ctrl page up"
"page down"
"ctrl page down"

Any values other than these will be flagged as invalid and the default will be used instead (if possible) for that session.