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Sumatra PDF vs PDFgear: catalog facts
Sumatra PDF	PDFgear
Free Completely free and open source with no ads, bundled software or subscription. No account…	Free Free to use on desktop, mobile and the web without an account.
Windows, Command line	Windows, macOS, Android, iOS, Web
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	Editing, conversion, merging and signing at no cost No sign-up required
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	Closed source AI features send document content to an online service
Downloadable app	Downloadable app, Web application
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 23, 2026

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