Free Compress PDF (browser-only)
Re-save PDFs locally for a smaller file when possible. Best for forms and vector PDFs; scanned books may see little change.
How to use this tool
- 1
Open PDF compressor
Use it for this task: PDF compression in-browser, private cloud-compressor alternative, no upload, no signup.
- 2
Choose a PDF file
Drop your PDF into the upload area or select it from your device, then set the available options.
- 3
Download the processed PDF
Run the action and save the new PDF file when the browser finishes processing it.
Quick facts
| Runs offline? | Yes — after pdf-lib loads, processing stays in your browser. |
|---|---|
| Uploads data? | No. Your PDF is not sent to our servers. |
| Account required? | No signup or login. |
| File size limit? | Up to 20 MB per file (browser memory). |
Top use cases
- PDF compression in-browser, private cloud-compressor alternative, no upload, no signup.
- Runs offline?: Yes — after pdf-lib loads, processing stays in your browser.
- Uploads data?: No. Your PDF is not sent to our servers.
- Account required?: No signup or login.
- File size limit?: Up to 20 MB per file (browser memory).
FAQ
Does my PDF leave this device?▾
No. The file is read and rewritten in your tab only.
How much smaller will my PDF get?▾
Often modest. This re-saves with object streams and cleanup — not Ghostscript-style image recompression. Scanned PDFs may barely shrink.
Password-protected PDFs?▾
Encrypted files cannot be opened without the password; unlock them first in a desktop tool.
Is merge or split supported?▾
Not in this version — only optimize a single PDF and download the result.
Mobile browsers?▾
Modern phones work for small files; large PDFs are smoother on desktop.
How to report issues?▾
Use the Contact link in the site footer.