Skip to content

Okular

The Universal Document Viewer

Multi-platform, fast and packed with features, Okular allows you to read PDF documents, comics and EPub books, browse images, visualize Markdown documents, and much more.

Screenshot of Okular
Illustration from David Revoy CC-BY-SA-4.0
下載

Support for Many Formats

Okular supports many formats, including PDF, EPub, DjVU and MD for documents; JPEG, PNG, GIF, Tiff, WebP for images; CBR and CBZ for comics; and many, many more.

See Format Compatibility table

Advanced User Interface


Okular has a wide range of features that lets you easily manage your documents.


A screenshot from Okular showing its annotation mode.

Annotate your PDFs


With Okular's 'Annotation mode', you can easily add inline and popup notes, highlight and underline text, or even add your own text.



Select and View any Text


With Okular's 'Selection mode', you can copy and paste almost anything from your documents to elsewhere. And, for those times the text you want to read is too small, you can use the 'Magnifier mode'.

Okular's 'Selection mode', with text, area and table selection options.
Okular's 'Text Magnifier' feature.

Okular's 'Content panel' auto renders a table of contents for a document.
Okular's 'Thumbnails panel' shows a thumbnail for each page of a document.

Your Content, at a Glance


Navigating your content is easier than ever. With Okular's 'Thumbnails panel', you can browse graphically the part of the document you were looking for. With the 'Content panel', find the chapter you need in all supported documents.


First-class Signature Support


You can view and verify digital signatures embedded in PDFs, check if they are still valid, and detect any modifications since the moment the document was signed. You can even sign PDFs yourself!

Okular showing a signed PDF.

Free Software

Okular is released under the GPLv2+, and is thus fully Free Software. Find the source code including guidance how to contribute in the Okular repository on KDE's GitLab. Okular also fully respects your privacy, see all details in the KDE Software Privacy Policy.

Logo for the PDF freedom initiative

Resource and Energy-Efficient Software

Okular is the very first software product to receive the Blue Angel ecolabel for being resource and energy efficient. Click on the label to find out more.

Blue Angel ecolabel, awarded by the German government to Okular for being energy efficient, saving resources, and providing transparent interfaces.

Latest News

Thursday, 18 August 2022

Okular 22.08 released

The 22.08 version of Okular has been released. This release contains various minor fixes and feature enhacements. You can check the full changelog at https://kde.org/announcements/changelogs/gear/22.08.0/#okular. Okular 22.08 is a recommended update for everyone using Okular.
Thursday, 21 April 2022

Okular 22.04 released

The 22.04 version of Okular has been released. The main changes of this release are the new Welcome Screen and fixes related to signing specially crafted PDF files, but it also contains various minor fixes and features. You can check the full changelog at https://kde.org/announcements/changelogs/gear/22.04.0/#okular. Okular 22.04 is a recommended update for everyone using Okular.
Thursday, 9 December 2021

Okular 21.12 released

The 21.12 version of Okular has been released. The main improvement of this release is proper support of Stamps in PDF files, but it also contains various minor fixes and features. You can check the full changelog at https://kde.org/announcements/changelogs/gear/21.12.0/#okular. Okular 21.12 is a recommended update for everyone using Okular.
Thursday, 12 August 2021

Okular 21.08 released

The 21.08 version of Okular has been released. This release contains various minor fixes and features all over. You can check the full changelog at https://kde.org/announcements/changelogs/gear/21.08.0/#okular. Okular 21.08 is a recommended update for everyone using Okular.
📢 View all Development News