Open source pdf-viewer projects
Every project in the registry tagged pdf-viewer, ranked by real GitHub adoption.
The Privacy First PDF Toolkit
A free-floating 2D Canvas for processing multiple PDF files simultaneously
This layout engine can solve the hardest layout problems imaginable. Its output is DTP grade and deterministic. It's faster than engines written in C++ because
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Frequently asked questions
How many open source pdf-viewer projects are there?
This registry tracks 3 projects tagged pdf-viewer, with 17,317 GitHub stars between them. The most-adopted is bentopdf at 15,578 stars.
Are these pdf-viewer projects free to use?
Yes — 3 of the 3 carry an explicit open-source licence across 3 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which pdf-viewer project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these pdf-viewer projects still maintained?
3 of the 3 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.