Okular

Okular

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.

History

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.

Features

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

References

  1. 1 2 KDE Developer's Corner - Google Summer of Code 2005 Projects
  2. 1 2 KDE Developer's Corner - Okular
  3. ↑ https://www.kde.org/info/applications-16.04.3.php
  4. ↑ Season of Usability Published on September 30th, 2007 by Ellen Reitmayr » Okular
  5. ↑ "Bug 151614 - store annotations with documents".
  6. ↑ 3 Alternatives to the Adobe PDF Reader on Linux - The Linux Foundation
  7. ↑ Jovie on KDE.org
  8. ↑ Okular - Document format handlers status
  9. ↑ Okular and DRM
  10. ↑ Okular, PDF and file permissions
  11. ↑ Okular, Debian, and copy restrictions
  12. ↑ Debian Bug report logs - #531221 okular: Arbitrarily enforces DRM by default
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