Okular: Universal Document Viewer For KDE 4

One of the new applications introduced with KDE 4 was Okular. KDE 3 had a PDF viewer named KPDF, but Okular aims to be a complete document viewing solution, supporting many different file types. Okular is fast-loading and works in any operating system and desktop environment that can run KDE applications.

Document Types

Out of the box, Okular can view a plethora of document types, including:

PDF – used for a variety of documents
PS – Postscript print documents
TIFF – often used for faxes
CHM – help files, ebooks, and online documentation
DjVu – scanned documents
Images – JPEG, PNG, and many more
DVI – device independent file format
XPS – windows printing specification
ODT – Open Document Text (for reading, not editing)
Fb2 – fiction book file format for eBooks
CBZ, CBR – comic book archive
Plucker – eBook format
Epub – free and open eBook standard
Fax – file format for faxes

Okular comic book viewer

Features

Okular has many of the standard PDF viewer features like page navigation, table of contents, browsing, zooming, text selection, and bookmarking. In addition, it also offers users the ability to annotate documents, highlight important information, have the computer read the entire document using text-to-speech technology, save annotated documents, view embedded files, listen to sounds and movies, fill out forms, search documents, and read DRM encrypted files.

Usage

Okular has four modes for viewing and manipulating documents:

1. Browse (Ctrl+1) – Clicking on the document allows you to drag the page up, down, left, or right.

2. Zoom (Ctrl+2) – Click and highlight an area to zoom in on it.

3. Selection Tool (Ctrl+3) – It uses a selection box to highlight any area and can copy images or text.

4. Text Selection Tool (Ctrl+4) – This functions more like a text editor’s selection tool, highlighting text, row-by-row.

To search a document, press “Ctrl+F” and enter the text you wish to find. The search tool will begin searching from the moment you start typing. It will highlight each occurrence of the text and give you the ability to navigate through them.

To start making annotations, press F6. A small vertical toolbar with each type of annotation will appear. They can take any of nine forms: note, inline note, green freehand line, yellow highlighter, straight yellow line, blue polygon, stamp, black underlining, and cyan eclipse.

Okular highlighting and notes

There are four view modes for Okular, found in the View menu:

  1. Single page – scrolls one page at a time
  2. Facing pages – displays two pages, side-by-side
  3. Facing pages (center first page) – like normal facing pages, but displays the first page by itself, which is useful if the first page is a book cover.
  4. Overview – which shows three zoomed-out pages at a time.

Also included in the view menu is the ability to rotate the document, trim the margins, and use the document as a presentation. By clicking presentation, the document becomes fullscreen, and the user can navigate through the pages just like a PowerPoint slideshow. When in presentation mode, a dial in the top right with a number in the center keeps track of the number of pages viewed.

Universal Viewer

Because of Okular’s versatility, you can use it to view any document, eBook, fax, or image quickly, easily, and safely. Okular is light enough to be portable and work well even on tablets and small devices, but it is also powerful enough to view very large, complex documents as well. Okular is part of KDE and is free and open source software, available to everyone.

7 comments

  1. Okular is great, I use it on a daily basis. But it misses some features, like an easy way to export annotations and better yet, to upload to cloud services such as Google Docs.

      • Case insensitive search mode works fine for me in Okular 0.10.4. After you’ve done Ctrl-F for find, there are three buttons. Choose the one labeled “Options” and then de-select “case sensitive” in the little window that pops up.

  2. I love Okular, use it all the time except when I need to print a pdf. For some reason the latest version won’t print pdf files so I need to use the gnome pdf viewer or adobes viewer to do the printing

  3. Hello everybody. Does anyone know how to keep selected an annotation tool once you’ve use it? I mean, I press f6 and then 3 to select the green pencil, I draw a line but If I need the green pencil again I need to press f6 and 3 each time I want to use it. Are you guys acquainted with some workaround to this?
    Cheers!

  4. Until recent (Nov. or December 2010 I believe) updates, Okular could be relied on for me to copy text and ‘save as text’ or ‘save as image.’ This worked great. After updates not long ago, I found there were two separate selection tools: one for saving text as images, which works fine, and another for saving text as text– which does NOT work at all. i.e. when I choose that option, it looks like I can select text, but when I click and drag absolutely nothing happens. Too bad, Okular was good… but looks broken in the text-saving function.

    Has anyone else experienced this?

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