Okular
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| Okular | |
|---|---|
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| Lua error in package.lua at line 80: module 'Module:InfoboxImage/data' not found. Okular displaying a PDF file on KDE Plasma 5 | |
| [[Programmer|Original authorTemplate:Pluralize from text]] | Piotr Szymański |
| [[Programmer|DeveloperTemplate:Pluralize from text]] | KDE |
| Initial release | 2005[1][2] |
| Written in | C++ |
| Operating system | Linux and Windows |
| Type | Universal document viewer |
| License | GPL-2.0-only or GPL-3.0-only |
| Website | okular |
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Okular is a free cross-platform document viewer developed by the KDE community based on the Qt and KDE Frameworks libraries. It is distributed as part of the KDE Applications bundle. It replaced KPDF, its main predecessor, alongside 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]
Okular for Windows
Okular is also available for Windows via the Microsoft Store[8] As this version is often not the most recent version, the most current possibly unstable "test version" may be downloaded as an .exe from the project's website, older versions are not available for download [9]
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.
Alongside regular text selection, rectangular selections can be copied or saved as images by right-clicking and dragging. Other features include reading text aloud using the Qt Speech module part of Qt since Qt 5 (previously using the Jovie,[11][12]), trimming of white page borders, printing documents with a printer or to a PDF file, shifting colors, and bookmarks.
Supported file formats
- Portable Document Format (PDF) with the Poppler backend
- PostScript with the libspectre backend
- Tag Image File Format (TIFF) with the libTIFF backend
- Microsoft Compiled HTML Help (CHM) with the libCHM backend
- DjVu with the DjVuLibre backend
- Device independent file format (DVI)
- Open XML Paper Specification (XPS)
- OpenDocument format (ODF) (only OpenDocument Text)
- FictionBook (*.fb2)
- ComicBook
- Plucker
- ePub
- Mobipocket
- Various image formats, such as JPG
- Markdown[13][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
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- List of PDF software
- Evince, the counterpart PDF viewer for GNOME
References
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- ^ a b KDE Developer's Corner - Google Summer of Code 2005 Projects Script error: No such module "webarchive".
- ^ a b KDE Developer's Corner - Okular Script error: No such module "webarchive".
- ^ Season of Usability Script error: No such module "webarchive". Published on September 30th, 2007 by Ellen Reitmayr » Okular
- ^ Page Module:Citation/CS1/styles.css has no content."News".
- ^ Page Module:Citation/CS1/styles.css has no content."Get Okular". Microsoft.
- ^ Page Module:Citation/CS1/styles.css has no content.Joseph P. De Veaugh-Geiss (16 March 2022). "First Ever Eco-Certified Computer Program: KDE's Popular PDF Reader Okular".
- ^ Page Module:Citation/CS1/styles.css has no content."Linux KDE receives first-ever eco-certification for Okular". Opensource.com.
- ^ Page Module:Citation/CS1/styles.css has no content."Okular". Microsoft Store. Microsoft. 2025-03-28. Retrieved 2025-03-28.
- ^ Page Module:Citation/CS1/styles.css has no content."Index of /ci-builds/graphics/okular/master/windows". Retrieved 2025-03-28.
- ^ Page Module:Citation/CS1/styles.css has no content."Bug 151614 - store annotations with documents". Archived from the original on 2014-08-19.
- ^ Page Module:Citation/CS1/styles.css has no content."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
- ^ KDE Applications 17.12.0 Full Log Page
- ^ Okular - Document format handlers status
- ^ Okular and DRM
- ^ Okular, PDF and file permissions
- ^ Okular, Debian, and copy restrictions
- ^ Debian Bug report logs - #531221 okular: Arbitrarily enforces DRM by default
External links
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