Compress PDF

Q: Why does it take a moment the first time?

The compression engine downloads once on first use and is then cached by your browser, so later compressions start quickly.

Shrink PDF file size while keeping quality — free and fully in your browser.

Drop a PDF here

or click to choose a file

Select PDF

Files are processed on your device and never uploaded.

How to compress a PDF

Make a large PDF smaller for email, upload or storage with this free compress PDF tool. It uses real Ghostscript compression (the same engine the pros use) running entirely in your browser, so your file is never uploaded.

Select your PDF.
Pick a compression level — "Recommended" is a great balance of size and quality.
Click Compress & Download and see how much smaller it got.

Frequently asked questions

How much smaller will my PDF get?

It depends on the file. Image-heavy or scanned PDFs can shrink 50–70%, while text-only PDFs change less.

Are my files uploaded?

No. Compression runs entirely in your browser, so your PDF stays on your device.

Why does it take a moment the first time?

The compression engine (~10 MB) downloads once on first use and is then cached by your browser, so later compressions start quickly.

100% private — no uploads.