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PDF-XChange EditorPDF4QT
Freemium

Most features are free. Some tools add a watermark unless you buy a licence.

 Free

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

Windows Windows, Linux, Command line
  • Most features work in the free version rather than being blocked
  • Fast rendering and a genuinely capable annotation toolset
  • Viewing and editing applications in one project
  • Command-line tool for scripted PDF work
  • Paid-only features watermark output rather than being hidden
  • Windows only, closed source
  • No macOS version
  • Mostly the work of a single principal developer
Downloadable app Downloadable app
Closed source Open source
License not stated 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.