Customizing keyboard shortcuts

Available in version 3.4 or later.

You can add new keyboard shortcuts or re-assign existing shortcut to a different command.

To customize keyboard shortcuts:

use Settings / Advanced Options... menu (or Ctrl + K to invoke Command Palette, type adv to narrow down and select Advanced Options... command)
this opens a notepad with advanced settings file
find Shortcuts array and add new shortcut definitions

An example of customization:

Shortcuts [
	[
		Cmd = CmdOpenFolder
		Key = Alt + O
	]
	[
		Cmd = CmdOpen
		Key = x
	]
	[
		Cmd = CmdNone
		Key = q
	]
]

Explanation:

we added Alt + O keyboard shortcut for CmdOpenFolder command. It opens a folder for browsing.
by default SumatraPDF has Ctrl + O shortcut for CmdOpen (open a file) command. This changes the shortcut to x
by default q closes the document. By binding it to CmdNone we can disable a built-in shortcut

Format of `Key` section:

just a key (like a, Z, 5) i.e. letters a to z, A to Z, and numbers 0 to 9
modifiers + key. Modifiers are: Shift, Alt, Ctrl e.g. Alt + F1, Ctrl + Shift + Y
there are some special keys (e.g. Alt + F3)
- F1 - F24
- numpad0 - numpad9 : 0 to 9 but on a numerical keyboard
- Delete, Backspace, Insert, Home, End, Escape
- Left, Right, Up, Down for arrow keys
- full list of special keys
without modifiers, case do matter i.e. a and A are different
with modifiers, use Shift to select upper-case i.e. Alt + a is the same as Alt + A , use Alt + Shift + A to select the upper-case A

The changes are applied right after you save settings file so that you can test changes without restarting SumatraPDF.

There is no indication if you make a mistake (i.e. use invalid command or invalid syntax for Key).

If the shortcut doesn’t work, double-check command name and keyboard shortcut syntax.