Okular
KDE's universal document viewer with annotations
Okular is the document viewer developed by the KDE community, opening PDF, EPUB, DjVu, XPS, comic books and other formats in one application. It supports highlighting, notes and other annotations, form filling and digital signatures for PDFs. Okular is free and open source, is usually installed with the KDE Plasma desktop on Linux and is also available for Windows.
- features
- 4
- alternatives
- 6
- platforms
- 2
- Updated
- Oct 12, 2026
Features
Our take
Pros
- Opens PDF, EPUB, DjVu, XPS and comics in one viewer
- Highlights, notes, form filling and digital signatures
- Free and open source, with no ads
Cons
- Cannot edit the text or images of a PDF
- Works best on KDE Plasma and feels less native elsewhere
Editorial assessment by the Alternatives.tools team, based on what the product is known for. Not a user review.
Best Okular alternatives
See all 6 alternatives
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Foxit PDF EditorFree trialBusiness PDF editor for Windows, Mac, mobile and the web
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PDF24 ToolsFreeFree PDF tools online and as a Windows desktop app
Stirling-PDFFreemiumOpen sourceSelf-hosted PDF toolbox with dozens of editing and conversion tools
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User reviews
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