The configuration is divided into the following categories:

  • Options

  • Keys

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

Config Options

These are fields whose values control various behaviours of the viewer. They are as follows:

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

    • Type: integer

    • Valid values: x > 0

  • font ratio: The font ratio used when --font-ratio CLI option is not specified.

    • Type: float

    • Valid values: x > 0.0

  • frame duration: The the time (in seconds) between frames of an animated image, when --frame-duration CLI option is not specified.

    • Type: float

    • Valid values: x > 0.0

  • max pixels: The maximum amount of pixels in images to be displayed in the TUI, when --max-pixels CLI option is not specified.

    • Type: integer

    • Valid values: x > 0

    • Any image having more pixels than the specified maximum will be replaced with a placeholder when displayed but can still be forced to display or viewed externally.

    • Note that increasing this will have adverse effects on performance.


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.

Here is a pre-configured config with Vim-style key-bindings (majorly navigation).
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.


  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 already used), the session is terminated.