Compress PDF
Reduce file size right in your browser — nothing is sent to server.
Drop a PDF here
or click to choose
Original
Compressed
Reduction
Strong and Extreme modes use Ghostscript® (AGPL license) running in your browser — source code.
0 bytes sent — this file never leaves your computer
In doubt? Open DevTools (F12) → Network tab: no upload occurs.
How it works
1
Upload PDF
We read the file in your browser.
2
Choose mode
Strong balances; Extreme reduces more; Light loses nothing.
3
Download
The compressed PDF, without sending anything.
Related tools
Frequently asked questions
How to compress a PDF for free without losing quality?
Upload the PDF and it is optimized to reduce size while keeping readability, ready to download. Compress PDF is free, no registration, and 100% in the browser.
Is compressing PDF online safe?
Yes. When compressing PDF here, nothing is sent to the server — the optimization is done in the browser itself, so the file never leaves your computer. Ideal for reducing sensitive documents securely.
How much does the PDF size decrease when compressing?
The reduction depends on the content: PDFs with many images usually shrink a lot, while plain text ones vary less. Either way, it's free, no registration, and you download the result instantly.