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Papers vs Okular: catalog facts
Papers	Okular
Free Free GNOME app, supported by donations to the GNOME Foundation.	Free Free and open source under the GPL.
Linux	Windows, macOS, Linux
Annotation and highlighting of PDFs Opens DjVu, TIFF and comic book archives	One viewer for a very wide range of document and comic formats Annotations are stored separately, so the original file is untouched
Linux only No full PDF text editing	Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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