Looking for a free PDF reader that can also open EPUB books and comic archives? KDE's Okular adds inline or pop-up notes, highlights and underlines to PDF pages, and it opens eBooks, comics, images, and other formats, with navigation panels for finding a page or chapter.
How do Okular’s annotation tools work?
Select annotation mode to mark up a PDF as you read. Okular supports inline and pop-up notes, text highlighting, underlining, and adding text.
- Use selection mode to copy text from a document.
- Enlarge small text with the magnification mode.
How can you find a page or chapter?
The thumbnail panel shows page previews, so you can scan a document visually and jump to a page. For chapter-based navigation, open the contents panel and select a section. These options work alongside scrolling and page selection.
Which documents and images can Okular open?
PDF and EPUB are among Okular’s supported document formats. It also handles DjVu and Markdown, along with comic-book files in CBR and CBZ formats. For images, supported types include JPEG, PNG, GIF, TIFF, and WebP.
What can Okular do with PDF signatures?
Okular can display and verify digital signatures embedded in PDF files. Its signature checks can report whether a signature remains valid and whether the document has changed since signing. The program can also add a signature to a PDF.
Pros
- Annotation mode supports notes, highlights, underlining, and added text
- Thumbnail and contents panels offer visual and chapter-based navigation
- Can display EPUB, DjVu, Markdown, CBR, and CBZ files
- PDF tools can check digital signatures and sign documents
Can Okular add notes and highlights to PDFs?
Yes. Annotation mode supports inline and pop-up notes, highlights, underlining, and added text.
Can Okular open EPUB books and comic files?
Yes. Okular supports EPUB books and CBR and CBZ comic files.
Can Okular verify a PDF signature?
Yes. It can check a signature’s validity and detect changes made after signing.