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Okular vs Adobe Acrobat Reader: catalog facts
Okular	Adobe Acrobat Reader
Free Free and open source under the GPL.	Freemium Free to use; editing and conversion require a paid Adobe Acrobat subscription.
Windows, macOS, Linux	Windows, macOS, Android, iOS
One viewer for a very wide range of document and comic formats Annotations are stored separately, so the original file is untouched	Faithful rendering of complex PDFs and forms Form filling, signing and annotation included free
Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor	Frequent prompts to upgrade to paid Acrobat Large install compared with lightweight readers
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	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 22, 2026	Official website Full listing and sources Checked October 1, 2026

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