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OkularPDF4QT
Free

Free and open source under the GPL.

 Free

Free and open source; donations are accepted through GitHub Sponsors.

Windows, macOS, Linux Windows, Linux, Command line
  • One viewer for a very wide range of document and comic formats
  • Annotations are stored separately, so the original file is untouched
  • Viewing and editing applications in one project
  • Command-line tool for scripted PDF work
  • Pulls in KDE libraries on non-KDE desktops
  • It is a viewer and annotator, not a PDF editor
  • No macOS version
  • Mostly the work of a single principal developer
Downloadable app Downloadable app
Open source Open source
License: GPL-2.0 License: MIT
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.