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Sumatra PDF vs Adobe Acrobat Reader: catalog facts
Sumatra PDF	Adobe Acrobat Reader
Free Completely free and open source with no ads, bundled software or subscription. No account…	Freemium Free to use; editing and conversion require a paid Adobe Acrobat subscription.
Windows, Command line	Windows, macOS, Android, iOS
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	Faithful rendering of complex PDFs and forms Form filling, signing and annotation included free
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	Frequent prompts to upgrade to paid Acrobat Large install compared with lightweight readers
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License: Proprietary
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 1, 2026

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