Okular
Overview
Okular is KDE’s universal document viewer built on the KDE Platform. It supports a wide range of document formats including PDF, EPUB, DjVu, XPS, CBR/CBZ (comic books), CHM, and many more. It provides annotation tools, form filling, and accessibility features for reading and reviewing documents.
Key Features
- Multi-Format Support: PDF, EPUB, DjVu, XPS, CBR/CBZ, CHM, TIFF, and more
- Annotations: highlight, underline, add notes and stamps
- Form Filling: complete PDF forms directly in the viewer
- Text Extraction: copy text from any supported format
- Accessibility: screen reader support, text-to-speech
- Bookmarks: save your place across documents
- Thumbnails: visual page navigation
Why Use It
Okular handles almost any document format you throw at it with a clean, consistent interface. Its annotation tools make it useful for students, researchers, and anyone who needs to review documents without proprietary software.
Use Cases
- Reading and annotating academic papers and EPUB books
- Reviewing PDF contracts and filling out forms
- Reading comic book archives (CBR/CBZ)
- Viewing technical documentation in multiple formats
Platforms
Linux, Windows, macOS (via Homebrew)
Licence
GNU General Public License v2 or later