Okular

Overview

Okular is a universal document viewer developed by KDE. It is an open-source, cross-platform application primarily designed for viewing PDF, PostScript, DjVu, XPS, ePub, TIFF and ODT documents, as well as comic books, and comic book archives.

Okular can be used as a standalone application, as well as a document viewing component embedded in other KDE applications such as Konqueror. It provides features such as text search, annotations, form filling, text selection, and a presentation mode.

Okular offers users a convenient, unified interface for viewing and manipulating documents of many different formats.

Features

• View and annotate PDF, PostScript, DjVu, XPS, ePub, TIFF and ODT documents, as well as comic books and comic book archives.

• Search text in documents.

• Create and edit annotations, highlight text, and fill forms.

• Text selection and copying.

• Presentation mode with support for transitions and animations.

• Have multiple documents open at the same time.

• Export documents to plain text or an Okular document archive.

• Embeddable viewer component for other KDE applications.

• Bookmarks, page thumbnails, and page display mode controls.

• Support for features such as encryption, digital signatures, and document links.

• Text-to-speech reading of a page or the whole document.

• Reviews panel that lists all annotations of a document.

• Fullscreen mode for better focus on documents.

• Supports drag-and-drop for easy document opening.

• Automatically displays document information such as title, author, and page number.

• Ability to rotate documents.

• Customizable user interface with support for multiple languages.

• Ability to print documents.

• Save PDF files with annotations and filled forms.

• View, verify and add digital signatures to PDF files.

• Compatible with a variety of formats, including PDF, PostScript, DjVu, XPS, ePub, TIFF, ODT, DVI, FictionBook, Markdown, images and comic books.

• Accessibility support.