Documentation : Customizing eBook UI

Sumatra has 2 UIs:

  • one for PDF/DjVu/Comic Book documents
  • another one for eBook documents (ePub, mobi etc.)

As of version 3.1.2 eBook UI doesn’t have zoom (changing font size), text selection etc.

There are 2 ways to customize eBook UI.

Use advanced settings

Use Settings -> Advanced Settings menu and find EbookUI section.

As described in https://www.sumatrapdfreader.org/settings.html , you can change the following aspects of eBook UI:

  • FontName
  • FontSize
  • TextColor
  • BackgroundColor

Use PDF UI for eBooks

Use Settings -> Advanced Settings menu and find EbookUI section.

Set UseFixedPageUI = true

Restart the app after changing the settings.


Krzysztof Kowalczyk