Customize external viewers

SumatraPDF makes it easy for you to open current document in a different program.

For example, if you also have Adobe Reader installed, you can use File menu to easily open PDF document you’re viewing in Adobe Reader. We auto-detect a bunch of popular apps (Adobe, FoxIt, PDF X-Change etc.).

You can also add custom readers using advanced settings.

To configure an external reader:

use Settings / Advanced Settings... menu to open configuration file
modifyExternalViewers section

Here are the relevant settings:

ExternalViewers [
  [
    CommandLine =
    Name =
    Filter =
  ]
]

An example could be:

ExternalViewers [
	[
		CommandLine = "C:\Program Files\FoxitReader\FoxitReader.exe" /A page=%p "%1"
		Name = Foxit &Basic 3D view or Review Text
		Filter = *.pdf
	]
]

CommandLine is a full path of executable that opens a given type of the file.

You can use special values in CommandLine:

"%1" : will be replaced with a full path of the current document
%p : replaced with current page number. Not all viewers support page number
"%d" : replaced with directory of the current document. Useful for launching file managers. Available in version 3.5 and later

Please make sure to use quotes around file / directory special values (i.e. "%1" and "%d") to avoid issues with file paths that have spaces in them.

Name will be displayed in File menu.

Filter restricts which files can be opened by the reader. For example:

to only activate it for PDF files, use *.pdf
to activate for PNG and JPEG files, use *.png;*.jpg;*.jpeg
to allow all files, use * (useful for file managers)

You can configure up to 10 external viewers.