Software:Okular

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Short description: Document viewer by KDE
Okular
Breezeicons-apps-48-okular.svg
Okular 21.12.1 screenshot.png
Okular showing a PDF in KDE Plasma 5
Original author(s)Piotr Szymański
Developer(s)KDE
Initial release2005; 19 years ago (2005)[1][2]
Written inC++
Operating systemLinux, Unix-like, Windows
TypeUniversal document viewer
LicenseGPL-2.0-only or GPL-3.0-only
Websiteokular.kde.org

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.

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.[3] 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.[4]

Since September 2019, Okular has been available in the Windows Store.[5]

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

In February 2022, Okular was awarded the Blue Angel environmental label award by the German government for sustainable software design.[6][7]

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[8]) 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,[9][10]), trimming of white page borders and setting of bookmarks.

File format support

It supports the following file formats:[11]

The official version obeys the DRM restrictions of PDF files by default, which may prevent copying, printing, or converting some PDF files. However, this can be turned off in the options under "Obey DRM limitations".[13][14][15][16]

See also

References

  1. ↑ 1.0 1.1 KDE Developer's Corner - Google Summer of Code 2005 Projects
  2. ↑ 2.0 2.1 KDE Developer's Corner - Okular
  3. ↑ Season of Usability Published on September 30th, 2007 by Ellen Reitmayr » Okular
  4. ↑ "News". https://okular.kde.org/news.php#itemOkular12released. 
  5. ↑ "Get Okular". https://www.microsoft.com/en-us/p/okular/9n41msq1wnm8. 
  6. ↑ Joseph P. De Veaugh-Geiss (16 March 2022). "First Ever Eco-Certified Computer Program: KDE's Popular PDF Reader Okular". https://eco.kde.org/blog/2022-03-16-press-release-okular-blue-angel/. 
  7. ↑ "Linux KDE receives first-ever eco-certification for Okular". https://opensource.com/article/22/4/linux-kde-eco-certification-okular. 
  8. ↑ "Bug 151614 - store annotations with documents". https://bugs.kde.org/show_bug.cgi?id=151614. 
  9. ↑ "3 Alternatives to the Adobe PDF Reader on Linux" (in en). 20 October 2014. https://www.linux.com/news/3-alternatives-adobe-pdf-reader-linux. 
  10. ↑ Jovie on KDE.org
  11. ↑ Okular - Document format handlers status
  12. ↑ KDE Applications 17.12.0 Full Log Page
  13. ↑ Okular and DRM
  14. ↑ Okular, PDF and file permissions
  15. ↑ Okular, Debian, and copy restrictions
  16. ↑ Debian Bug report logs - #531221 okular: Arbitrarily enforces DRM by default

External links



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