If there is one thing the open source community is not short of it is document viewers. We have published articles on a couple of them in the past not excluding Buka, Bookworm, and Easy Ebook Viewer.

Today, we introduce to you another document viewer you can use to read ePub ebooks and PDFs and it goes by the name of Okular, is an open source and cross-platform KDE-developed document viewer and it ships together with the KDE application release.

This means that if you run KDE then you probably have Okular installed on your system. The document viewer has support for a variety of document formats including PDF, ePub, XPS, DjVu, CHM, and Postscript, among others.

With PDF documents, users can add comments, highlight sections, and add several shapes without affecting the original file. Okular also features an inbuilt reading service (Jovie), along with the ability to extract text from eBooks into separate text files.

Features in Okular

FOSS : Okular is free to download and use with its source code freely available at KDE’s Community Wiki.

: Okular is free to download and use with its source code freely available at KDE’s Community Wiki. Cross-platform : Enjoy a uniform service across GNU/Linux, BSDs, Mac, and Windows platforms.

: Enjoy a uniform service across GNU/Linux, BSDs, Mac, and Windows platforms. PDF editing functions including commenting, highlighting, managing thumbnails, bookmarking, etc.

A customizable User Interface with toggable options bars.

Review mode: View all the document pages at once in a grid form.

A variety of backends including PDF, TIFF< DjVu, etc.

Support for annotations.

Extract embedded files from documents.

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You can easily install Okular on your Ubuntu distro with a single command.

$ sudo apt-get install okular

If you would rather not use the command line then check out alternative installation methods not only for your distro but for other platforms by following the button below.

Download Okular for Linux

Have you come across Okular before? How does it compare to your default document viewer and which other apps do you have to add to our virtual suggestion box? Drop your comments in the conversation section below.