Okular
Original author(s) | Piotr Szymański |
---|---|
Developer(s) | KDE |
Initial release | 2005[1][2] |
Stable release | 24.02.1[3]
/ 19 March 2024 |
Preview release | 21.11.90[4]
/ 24 November 2021 |
Repository | |
Written in | Windows |
Type | Universal document viewer |
License | GPL-2.0-only or GPL-3.0-only |
Website | okular |
Okular is a multiplatform document viewer developed by the
History
Okular was started for the
When it was ported to Qt 5 in December 2016, the version numbering jumped from 0.26 to 1.0.[6]
Since September 2019, Okular has been available in the Windows Store.[7]
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
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[10]) 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
), trimming of white page borders and setting of bookmarks.File format support
It supports the following file formats:[13]
- Portable Document Format (PDF) with the Popplerbackend
- PostScript with the libspectre backend
- Tag Image File Format (TIFF) with the libTIFFbackend
- Microsoft Compiled HTML Help (CHM) with the libCHM backend
- DjVuLibrebackend
- Device independent file format (DVI)
- XML Paper Specification(XPS)
- OpenDocument format (ODF) (only OpenDocument Text)
- FictionBook (*.fb2)
- ComicBook
- Plucker
- ePub
- Mobipocket
- Various image formats, such as JPG
- Markdown[14]
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".[15][16][17][18]
See also
- List of PDF software
- Evince, the counterpart PDF viewer for GNOME
References
- ^ a b KDE Developer's Corner - Google Summer of Code 2005 Projects Archived 2006-06-28 at the Wayback Machine
- ^ a b KDE Developer's Corner - Okular Archived 2005-12-11 at the Wayback Machine
- ^ "Create tag for 24.02.1".
- ^ Error: Unable to display the reference properly. See the documentation for details.
- ^ Season of Usability Archived 2013-09-25 at the Wayback Machine Published on September 30th, 2007 by Ellen Reitmayr » Okular
- ^ "News".
- ^ "Get Okular". Microsoft.
- ^ Joseph P. De Veaugh-Geiss (16 March 2022). "First Ever Eco-Certified Computer Program: KDE's Popular PDF Reader Okular".
- ^ "Linux KDE receives first-ever eco-certification for Okular". Opensource.com.
- ^ "Bug 151614 - store annotations with documents". Archived from the original on 2014-08-19.
- ^ "3 Alternatives to the Adobe PDF Reader on Linux". Linux.com | The source for Linux information. 20 October 2014. Retrieved 2018-09-14.
- ^ Jovie on KDE.org
- ^ Okular - Document format handlers status
- ^ KDE Applications 17.12.0 Full Log Page
- ^ Okular and DRM
- ^ Okular, PDF and file permissions
- ^ Okular, Debian, and copy restrictions
- ^ Debian Bug report logs - #531221 okular: Arbitrarily enforces DRM by default