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okular is a powerful universal document viewer based on KPDF for KDE 4 with a plugin system.

okular combines the excellent functionality of KPDF with the versatility of supporting different kind of documents, including PDF, Postscript, DjVu, CHM, and others.

Its development began as part of Google's Summer of Code program.

 okular 0.21

Free to download



Pingo Toscano, Albert Astals Cid, Tobias Koenig, Brad Hards, Piotr Szymanski, and Florian Graessle


System Requirements
KDE 4 environment

Okular SlidesFAQ

Selected Reviews:
Linux Insider,

Features include:

  • Thumbnails
  • Table of Contents
  • Links and hyperlinks
  • Presentation mode
  • Customizable view
  • Text extraction
  • Multicolumns view
  • Page rotation
  • Annotations and Bookmarks
  • Forms support
  • Embedded files in documents
  • Multimedia support

Formats supported:

  • Portable Document Format (PDF) with the Poppler backend
  • Postscript with the libgs backend
  • Tagged Image File Format (TIFF) with the libTIFF backend
  • Microsoft Compiled HTML Help (CHM) with the libCHM backend
  • DjVu with the DjVuLibre backend
  • Images
  • DeVice Independent (DVI) - the output format of the TeX typesetting software
  • XML Paper Specification (XPS) - a document storage and viewing specification developed by Microsoft
  • Open Document Format (ODF) - implemented by the office suite
  • FictionBook - an open XML-based ebook format
  • Comicbook - a format used to distribute online comics
  • Plucker

Return to PDF Tools Home Page | Return to e-book Tools Home Page

okular also features in our 'Linux Equivalents to Windows Software' section. The category selector below allows you to filter the different types of software included in that separate article.


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Last Updated Wednesday, April 29 2015 @ 02:00 PM EDT

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