Zathura is a highly customizable and functional document viewer. It provides a minimalistic and space saving interface as well as an easy usage that mainly focuses on keyboard interaction.
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The best open source alternative to Okular is SumatraPDF. If that doesn't suit you, our users have ranked more than 100 alternatives to Okular and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Okular are PdfCraft, LibreOffice - Draw, KOReader and Koodo Reader.
Zathura is a highly customizable and functional document viewer. It provides a minimalistic and space saving interface as well as an easy usage that mainly focuses on keyboard interaction.


Open-source PDF viewer and editor using Qt framework, featuring hardware-accelerated rendering, encryption, multithreading, text-to-speech, annotation tools, form filling, high-res monitor support, document compression, audio book conversion, and signature validation.


Shelf is a convergent document viewer that supports PDF and EPUB files. With Shelf, you can organize your document collection by creating tags, like other Maui applications.



Blazing fast PDF and portable eReader built on muPDF. Including the ability to save "highlights" and notes like on Kindle.




A simple PDF Reader built using Electron and PDF.js.


PdfDing is a browser based PDF manager, viewer and editor that you can host yourself. It offers a seamless user experience on multiple devices. It's designed be to be minimal, fast, and easy to set up using Docker.



The simplest PDF viewer. Safe (doesn't require permissions), lightweight (just 6,9MB) and modern.




An ebook reader and library management app supporting ".epub" files. Arianna discovers your books automatically, and sorts them by categories, genres and authors.




Xpdf is a free PDF viewer and toolkit, including a text extractor, image converter, HTML converter, and more. Most of the tools are available as open source.

Simple macOS PDF reader with ChatGPT integrated. You can chat with your local PDF. The returned response can cite the page number to ensure correctness.

PrivatePDF is a free web tool that lets you make quick PDF edits from within your web browser, without uploading anything anywhere.



