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PDFgearSumatra PDF
Free

Free to use on desktop, mobile and the web without an account.

 Free

Completely free and open source with no ads, bundled software or subscription. No account…

Windows, macOS, Android, iOS, Web Windows, Command line
  • Editing, conversion, merging and signing at no cost
  • No sign-up required
  • Opens PDF, EPUB, MOBI, FictionBook, CBZ/CBR/CBT/CB7, DjVu, XPS, CHM, SVG and many image formats including HEIC and AVIF
  • Lightweight and fast; the portable single .exe build writes nothing to the registry
  • Closed source
  • AI features send document content to an online service
  • Windows only (Windows 7 through 11; XP and Vista need version 3.1.2); no macOS or Linux version
  • Only unencrypted EPUB and MOBI/AZW ebooks open; DRM-protected files are not supported
Downloadable app, Web application Downloadable app
Closed source Open source
License not stated License: GPL-3.0
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked September 20, 2026

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