Okular

Okular is a multiplatform document viewer developed by the KDE community and based on Qt and KDE Frameworks libraries. It is distributed as part of the KDE Applications bundle. Its origins are from KPDF and it replaces KPDF, KGhostView, KFax, KFaxview and KDVI in KDE 4. Its functionality can be embedded in other applications.

Okular
Okular showing a PDF in KDE Plasma 5
Original author(s)Piotr Szymański
Developer(s)The Okular Team
Initial release2005 (2005)[1][2]
Stable release
20.12[3] / 10 December 2020 (2020-12-10)
Repository
Written inC++
Operating systemLinux, Unix-like, Windows
TypeUniversal document viewer
LicenseGNU General Public License
Websiteokular.kde.org

History

Okular was started for the Google Summer of Code of 2005 by Piotr Szymański.[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.

When it was ported to Qt 5 in December 2016, the version numbering jumped from 0.26 to 1.0.[5]

Since September 2019, Okular is available in the Windows Store.[6]

In December 2020, the software versioning scheme was changed from sequence-based identifier to CalVer.

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[7]) can be saved in the document as standard PDF annotations.

It is possible to select parts of the document for copying text or image to the clipboard. Other features include reading text aloud using the Qt Speech module part of Qt since Qt 5 (previously using the Jovie,[8][9]), trimming of white page borders and setting of bookmarks.

File format support

It supports the following file formats:[10]

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.[12][13][14][15]

See also

References
  1. KDE Developer's Corner - Google Summer of Code 2005 Projects Archived 2006-06-28 at the Wayback Machine
  2. KDE Developer's Corner - Okular Archived 2005-12-11 at the Wayback Machine
  3. https://okular.kde.org/news.php
  4. Season of Usability Archived 2013-09-25 at the Wayback Machine Published on September 30th, 2007 by Ellen Reitmayr » Okular
  5. https://okular.kde.org/news.php#itemOkular12released
  6. https://www.microsoft.com/en-us/p/okular/9n41msq1wnm8
  7. "Bug 151614 - store annotations with documents". Archived from the original on 2014-08-19.
  8. "3 Alternatives to the Adobe PDF Reader on Linux". Linux.com | The source for Linux information. Retrieved 2018-09-14.
  9. Jovie on KDE.org
  10. Okular - Document format handlers status
  11. KDE Applications 17.12.0 Full Log Page
  12. Okular and DRM
  13. Okular, PDF and file permissions
  14. Okular, Debian, and copy restrictions
  15. Debian Bug report logs - #531221 okular: Arbitrarily enforces DRM by default
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