Okular

Okular

Okular showing a PDF in KDE SC 4
Developer(s)	The Okular Team
Stable release	0.13 / July 27, 2011; 3 months ago (2011-07-27)
Operating system	Linux, Unix-like, Windows, Mac OS X
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.

Okular was started for the Google Summer of Code of 2005; Piotr Szymański was the accepted student^{[clarification needed][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.

Okular has additional features, including commenting on pdf documents, highlighting and drawing lines, geometric shapes, adding textboxes, and stamps. You can extract the text to a text file. You can select parts to save them or copy as text or image to the clipboard. You can trim white page borders and set bookmarks.

It supports the following file formats^[4]:

• Portable Document Format (PDF) with the Poppler backend
• PostScript with the libgs backend (Okular 0.6/KDE 4.0) / libspectre backend (Okular >= 0.7/KDE >= 4.1)
• Tagged 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)
• XML Paper Specification (XPS)
• OpenDocument format (ODF)
• FictionBook
• ComicBook
• Plucker
• EPUB
• Mobipocket
• Various image formats.

See also

Free software portal

• List of PDF software
• Evince - the counterpart PDF viewer for GNOME.

References

1. ^ KDE Developer's Corner - Google Summer of Code 2005 Projects
2. ^ KDE Developer's Corner - oKular
3. ^ Season of Usability Published on September 30th, 2007 by Ellen Reitmayr » Blog Archive » Success Stories ‘07: Okular
4. ^ Okular - more than a reader - document format handlers status

External links

• Okular home page
• Okular user wiki