Free for Windows 10 and 11 · works offline
Compress a PDF on Windows, offline
Too big to email or upload? S Converter shrinks PDFs on your PC, without sending your documents to a website.
How to do it with S Converter
- Open S Converter and choose PDF Tools in the sidebar.
- Pick Compress.
- Drag in your PDFs.
- Press Convert. The smaller copies are saved next to the originals, and S Converter shows how much space you saved.
Or right from File Explorer
- Select the PDFs in File Explorer.
- Press Ctrl + Alt + C and click Compress on the wheel.
The shortcut works while S Converter is running (it waits in the system tray). In the version from GitHub you can also right-click files and choose S Converter; on Windows 11 it's under Show more options.
Why S Converter
Sharp text
Pictures are compressed; text stays crisp.
See the saving
The finished screen shows the before and after size.
Originals kept
Your original PDF is never overwritten.
Questions
How much smaller will it get?
PDFs full of photos or scans often shrink a lot; PDFs that are mostly text are already small and change less.
Is it safe for confidential documents?
Yes. Everything happens on your PC and nothing is uploaded.
Related guides
Get S Converter
Free, no ads, no account. Images, video, audio, documents, PDFs and archives, all converted on your own PC.