Very lightweight open-source PDF reader for Windows. It also opens EPUB, MOBI and CBZ comics.
Open sourceEasy to use
Free alternative to
Code activity
- Stars
- 17,957
- Forks
- 2,083
- Open issues & PRs
- 36
- Last commit
- today
- Latest release
- 7 months ago
Details
- Type
- Open source
- License
- GPL-3.0
- Written in
- CC++AssemblyTypeScript
- Platforms
- Windows
- Ease of use
- Easy to use

Pros
- Opens very fast, far lighter than Acrobat Reader
- Reads e-books as well
Cons
- Reading and simple annotations only, no PDF content editing
Use Sumatra PDF instead of
Adobe AcrobatAn ultra-light reader that opens PDFs instantly, unlike the heavier Acrobat Reader.
How is the 92/100 "Health" score calculated?
Dorabot computes it weekly from public GitHub data; it is not a review of software quality: 40 points for code freshness (a commit in the last 30 days earns full points), 25 points for popularity by stars, 20 points for a recent release, 15 points for the ratio of open issues to stars. 80+ is Good, 60–79 Fair, below 60 Weak.
FAQ
Is Sumatra PDF free?
Yes. Sumatra PDF is open source (GPL-3.0 license) and free for personal and commercial use.
Which platforms does Sumatra PDF run on?
Sumatra PDF is available for Windows.
What can I use Sumatra PDF instead of?
Sumatra PDF is a free alternative to Adobe Acrobat.
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