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PDF Tools vs Okular: catalog facts
PDF Tools	Okular
Free Free and open source under the GPL-3.0.	Free Free and open source under the GPL.
Windows, macOS, Linux	Windows, macOS, Linux
Reads and annotates PDFs inside Emacs Search and link navigation	One viewer for a very wide range of document and comic formats Annotations are stored separately, so the original file is untouched
Only useful to Emacs users Requires building or installing the epdfinfo server	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: GPL-3.0	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 24, 2026	Official website Full listing and sources Checked September 22, 2026

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