Evince, the counterpart PDF viewer for GNOME.This can be turned off in the options under "Obey DRM limitations", however. The official version obeys the DRM restrictions of PDF files by default, which may prevent copying, printing, or converting some PDF files. OpenDocument format (ODF) (only OpenDocument Text).Microsoft Compiled HTML Help (CHM) with the libCHM backend.Tagged Image File Format (TIFF) with the libTIFF backend.Portable Document Format (PDF) with the Poppler backend.Other features include reading text aloud using the Qt Speech module part of Qt since Qt 5 (previously using the Jovie, ), trimming of white page borders and setting of bookmarks. It is possible to select parts of the document for copying text or image to the clipboard. Annotations are stored separately from the unmodified PDF file, or (since version 0.15 with Poppler 0.20 ) can be saved in the document as standard PDF annotations. Okular's annotation features include commenting on PDF documents, highlighting and drawing lines, geometric shapes, adding textboxes, and stamps. In February 2022, Okular was awarded the Blue Angel environmental label award by the German government for sustainable software design. In December 2020, the software versioning scheme was changed from sequence-based identifier to CalVer. Since September 2019, Okular is available in the Windows Store. When it was ported to Qt 5 in December 2016, the version numbering jumped from 0.26 to 1.0. In this season the Okular toolbar mockup was created based on an analysis of other popular document viewers and a usage survey. Okular was identified as a success story of the 2007 Season of Usability. Okular was started for the Google Summer of Code of 2005 by Piotr SzymaĆski. Its functionality can be embedded in other applications. Its origins are from KPDF and it replaces KPDF, KGhostView, KFax, KFaxview and KDVI in KDE 4. It is distributed as part of the KDE Applications bundle. Okular is a multiplatform document viewer developed by the KDE community and based on Qt and KDE Frameworks libraries.
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