SumatraPDF
Open sourceKrzysztof Kowalczyk
- Category
- Documents & PDF
- Version
- 3.6.1
- Manifest checked
- 2026-10-23
- Size
- ~11 MB
- Licence terms
- Open source (GPL v3) · free for personal and business use
- Supported OS
- Windows 11 · 10
- Install method
- Automatic install supported
- Developer
- Krzysztof Kowalczyk
- Downloads via this site
This links to Krzysztof Kowalczyk’s own download source. AfterFormat neither stores nor modifies installer files.
Check before installing
- View-only. No annotation and no signing.
What it is
A very light viewer for PDFs and e-books. The install is around ten megabytes and it runs from a single executable, so double-clicking a file opens it with no perceptible wait. It is view-only — no annotation, no signing.
When to pick this
If you only read PDFs and want it light — especially on a low-spec machine. For annotation or signing, use Foxit or Acrobat Reader.
Details
Instant open
The program is small enough that there is effectively no startup delay. If your PDF reader feels heavy, the difference is obvious.
Formats
PDF plus ePub, MOBI, DjVu and CBZ, so it covers e-books and comics too.
View-only
No annotation, highlighting, signing or editing. Those need a different program.
After a reformat
One settings file is all there is
Settings and the recent-files list are in %LOCALAPPDATA%\SumatraPDF\SumatraPDF-settings.txt. If you changed anything, copying that file is enough.
Default PDF app
Setup asks whether to make it the default viewer. Later, use Settings → Apps → Default apps.
Distribution
- winget ID
- SumatraPDF.SumatraPDF
- Redistribution policy
- Open source licence
- Manifest checked
- 2026-10-23
- Official site
- https://www.sumatrapdfreader.org/
The date the version and installer URL were checked in winget. This is separate from a usage-terms review or an installation test.
Original winget manifest
