Okular showing a PDF in KDE SC 4
Original author(s) Piotr Szymański
Developer(s) The Okular Team
Initial release 2005 (2005)[1][2]
Stable release
16.04.3[3] / 12 July 2016 (2016-07-12)
Written in C++
Operating system Linux, Unix-like
Type Universal document viewer
License GNU General Public License
Website okular.kde.org

Okular is the document viewer for KDE SC 4 (although it does not require the full KDE desktop). It is based on KPDF and it replaced KPDF, KGhostView, KFax, KFaxview and KDVI in KDE 4. Its functionality can be easily embedded in other applications.


Okular was started for the Google Summer of Code of 2005; Piotr Szymański was the accepted student.[1][2]

Okular was identified as a success story of the 2007 Season of Usability.[4] In this season the Okular toolbar mockup was created based on an analysis of other popular document viewers and a usage survey.


Okular's annotation features include commenting on PDF documents, highlighting and drawing lines, geometric shapes, adding textboxes, and stamps. Annotations are stored separately from the unmodified PDF file, or (since version 0.15 with Poppler 0.20[5]) can be saved in the document as standard PDF annotations.

Text can be extracted to a text file. It is possible to select parts of the document and copy the text or image to the clipboard. Other features include reading text aloud using Jovie,[6][7] trimming of white page borders and setting of bookmarks

File format support

It supports the following file formats:[8]

The official version obeys the DRM restrictions of PDF files by default, which may prevent copying, printing, or converting some PDF files. This can be turned off in the options under "Obey DRM limitations", however.[9][10][11][12]

See also


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