Okular

Short description: Document viewer by KDE

Okular

Okular showing a PDF in KDE Plasma 5

Original author(s)| Piotr Szymański
Developer(s)| KDE
Initial release| 2005; 19 years ago (2005)[1][2]
Written in| C++
Operating system| Linux, Unix-like, Windows
Type| Universal document viewer
License| GPL-2.0-only or GPL-3.0-only
Website| okular.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.

## Contents

* 1 History
* 2 Features
* 2.1 File format support
* 3 See also
* 4 References
* 5 External links

## 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]

* 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)
* XML Paper Specification (XPS)
* OpenDocument format (ODF) (only OpenDocument Text)
* FictionBook (*.fb2)
* ComicBook
* Plucker
* ePub
* Mobipocket
* Various image formats, such as JPG
* Markdown[12]

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

* List of PDF software
* Evince, the counterpart PDF viewer for GNOME

## 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

* Okular user wiki
* Online PDF editor

* v
* t
* e

PDF software

Free and open-source|

* Evince
* KPDF
* LibreOffice
* LibHaru
* MuPDF
* Okular
* PDF.js
* PDF Split and Merge
* podofo
* Poppler
* Scribus
* Skim
* Sumatra PDF
* Xpdf
* Zathura

Proprietary|

| Freeware|

* Foxit Reader
* PDF-XChange Viewer
* STDU Viewer
* Apple Books

|

Commercial|

* Adobe Acrobat
* Nitro PDF
* PDF Signer
* Pdfvue
* Preview
* Soda PDF
* WPS Office
* PDF Studio

List of PDF software

* v
* t
* e

E-books

Formats|

* ePub
* FictionBook
* CBR/CBZ
* Kindle File Format
* Mobipocket
* PDF
* Plain text
* IBA

Reading|

| Devices|

* Amazon Kindle
* Barnes & Noble Nook
* Bookeen
* Elonex ebook
* enTourage eDGe
* Hanlin eReader
* iPad
* iriver Story
* Kobo eReader
* Onyx Boox
* Plastic Logic Reader
* PocketBook eReader
* Rocket eBook
* SoftBook
* Smartphones
* Tablets
* Tolino

|

Software|

* Adobe Acrobat
* Adobe Digital Editions
* Aldiko
* Apple Books (iBooks)
* Aquafadas
* Blio
* Bluefire Reader
* Calibre
* FBReader
* Google Play Books
* Kindle app
* Kitabu
* Kobo
* Lektz
* Lucifox
* Okular
* OverDrive Media Console
* Snapplify
* STDU Viewer
* Sumatra PDF

Editing|

* ABBYY FineReader
* AbiWord
* Adobe InDesign
* Adobe RoboHelp
* Aquafadas
* Atlantis Word Processor
* Booktype
* Calibre
* Calligra Author
* eXeLearning
* Help & Manual
* HelpNDoc
* iBooks Author
* iStudio Publisher
* LaTeX
* LibreOffice
* MadCap Flare
* Oxygen XML Editor
* PagePlus
* Pages
* QuarkXPress
* Scrivener
* Sigil
* Writer2epub

Vendors|

| Commercial|

* Amazon Kindle Store
* Baen Free Library
* Barnes & Noble
* Booktrack
* Feedbooks
* Google Play
* iBooks Store
* Jarir.com
* Kobo Bookstore
* Sony Reader Store
* Smashwords

|

Noncommercial|

* Faded Page
* HathiTrust
* Internet Archive
* Project Gutenberg
* Australia
* Canada
* Wikisource

Related
topics|

* Academic journal publishing reform
* Braille e-book
* Comparison of e-book readers
* Comparison of iOS e-book reader software
* Comparison of Android e-book reader software
* E-book lending
* Electronic publishing
* iBooks Author Conference
* International Digital Publishing Forum
* Kindle single
* OPDS
* Reflowable document
* Semantic publishing

* v
* t
* e

KDE

Software
Compilation|

* KDE 1
* KDE 2
* KDE 3
* KDE SC 4
* Post-fourth series
* KDE Plasma 5
* KDE Frameworks
* KDE Applications

Applications
by KDE|

| Development|

* Cervisia
* KDevelop
* KImageMapEditor
* Kompare
* Quanta Plus
* Umbrello

|

Education|

* Cantor
* GCompris
* KAlgebra
* Kanagram
* KBibTeX
* KGeography
* KHangMan
* Kig
* Kiten
* KLettres
* KmPlot
* KStars
* KTouch
* KTurtle
* KWordQuiz
* LabPlot
* Marble
* RKWard
* Step

Graphics|

* digiKam
* Gwenview
* Karbon
* KColorEdit
* KolourPaint
* KPhotoAlbum
* Krita
* Spectacle
* Skanlite

Internet|

* KGet
* KMLDonkey
* Konqueror
* Kontact
* Konversation
* Kopete
* KTorrent
* Rekonq

Multimedia|

* Amarok
* Dragon Player
* JuK
* K3b
* Kaffeine
* Kdenlive

Office|

* Okular
* Calligra Suite
* Words
* Sheets
* Stage
* Flow
* Karbon
* Kexi
* Plan
* Kile
* KMyMoney
* Kontact
* KPilot
* Tellico
* Trojitá

System|

* Discover
* Dolphin
* KDE Partition Manager
* KDE System Guard
* KInfoCenter
* Konsole
* Yakuake

Utilities|

* Ark
* Filelight
* KAlarm
* Kate
* KCalc
* KGPG
* Klipper
* Krusader
* KRename
* KWallet
* KWrite

Platform|

| User interface|

| Current|

* KDE Plasma 5
* KWin

|

Discontinued|

* KDesktop
* Kicker
* SuperKaramba
* KDE Plasma 4
* KSnapshot
* Oxygen Project
* Crystal Project

Current|

* KWin
* SDDM (5–)
* Qt
* KDE Frameworks 5 (5–)
* Akonadi
* Flake
* KJS
* KHTML
* KIO
* ThreadWeaver
* KIPI
* KParts
* Kross
* Phonon
* Solid
* Sonnet
* XMLGUI

Discontinued|

* KDElibs (–3)
* DCOP (3)
* KDE Platform 4 (4)
* KDM (–4)
* NEPOMUK (4.13)
* Strigi

freedesktop.org
(shared)|

* AppStream
* D-Bus
* GStreamer
* NetworkManager
* Poppler
* Wayland
* X.Org Server
* PulseAudio

Community|

* KDE e.V.
* Akademy
* KDE.News
* Konqi

People|

* Matthias Kalle Dalheimer
* Matthias Ettrich
* Adriaan de Groot
* Frank Karlitschek
* Celeste Lyn Paul
* Nuno Pinheiro
* Cornelius Schumacher
* David Vignoni

* Category

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