Okular is a fantastic application to use for viewing and annotating documents like PDF and ebooks.

  • Okular is written using the KDE framework, so expect its installation to be heavy:
$ sudo apt install okular
  • It supports viewing a whole bunch of formats for viewing: PDF, DjVu, EPUB, TIFF, CHM and other ebook formats.
  • By default, the backends for the non-PDF formats are not installed. To get them:
$ sudo apt install okular-extra-backends
  • There is full zoom-in, zoom-out, continuous or separated page viewing options.
  • Table of contents are shown for ebooks, PDF and DjVu files that have it.
  • Thumbnails of current and neighboring pages can be viewed.
  • Okular uses a printing backend that is different from the one used by Evince, the default document viewer in Ubuntu. So, if you have printing problems in Evince, try Okular.
  • Annotating documents by adding notes, highlighting and freehand is easy.

Tried with: Okular 0.19.3 and Ubuntu 14.04

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