Your browser does the work, not our server
The page loads once. After that, everything happens on your device.
Our server
Sends the web page, once
Your files: never
Your phone or computer
Your PDF
2.4 MB
Compressed in this browser tab
Right here, offline
Smaller PDF
310 KB
Check it yourself
- Airplane mode. Open this site, turn off the internet, then compress a file. It still works.
- Network tab. On a computer, press F12, open Network and compress a file. Nothing is uploaded.
- Security header. Our pages tell your browser to block sending data to any other site (
connect-src 'self').
Good to know
- Text stays sharp. We shrink the photos and scans inside your PDF.
- Very small sizes may turn pages into images. We tell you when that happens.
- Password-protected PDFs need the password removed first.
- Huge files depend on your device’s memory.
Built with the open-source pdf-lib and Mozilla PDF.js, running in your browser.