100% Browser-Based

Shrink PDFs without losing quality

Reduce PDF file size for email, uploads, and storage. Everything runs in your browser — your files never leave your device.

Compress PDF

The PDF compressor built for real documents

No uploads. No waiting. No tracking. Just fast, high-quality compression you can trust with confidential files.

Private by design

Your PDFs are compressed locally in your browser. They never touch a server, never get logged, never get stored.

Instant results

No upload queue, no progress bars. Compression happens the moment you drop a PDF in.

Free forever

No sign-up, no watermarks, no daily limits, no paywalls. Just a tool that works.

When you need a smaller PDF

Email attachments

Most email providers cap attachments at 25 MB. Compress your PDF so it actually goes through.

Uploads and forms

Government portals, job applications, and legal uploads often require files under 2 MB or 5 MB.

Scanned documents

Scans produce huge files. Compress them down to a sensible size without losing legibility.

Frequently asked questions

No. CompressPDFs runs entirely in your browser. Your files are processed locally using client-side JavaScript and never leave your device. We have no way to see what you compress — perfect for confidential documents.
It depends on what's inside. PDFs with a lot of images usually shrink dramatically — often 50% to 90%. Text-only PDFs that are already well optimized have less room, but we still squeeze out what we can.
Yes. We compress embedded images while leaving text layers untouched, so your PDF stays fully searchable and the text remains crisp at any zoom level.
Because everything runs in your browser, the limit depends on your device's memory. Most modern computers handle PDFs up to a few hundred megabytes without trouble.
Yes. No sign-up, no watermarks, no paywalls. The service is funded by occasional ads and runs at zero cost to you.