Compress a PDF online, free
Run a safe, lossless re-save that can reduce a PDF's size. It will not reduce every PDF — already-optimized files may stay the same — and we never claim guaranteed reduction.
Files are processed locally in your browser and are not uploaded to a server. No account, no watermark, no tracking.
How to use it
- Open the Compress tool and choose a PDF.
- Click Optimize to run a safe, lossless re-save.
- If the size is reduced, download the optimized PDF.
Good to know
- Browser-only compression is limited; not every PDF can be reduced.
- Image-based / rasterized compression is not available (future work).
Privacy & honesty
Your documents stay on your device — LocalSign has no servers that receive your files. Signatures, stamps, highlights, shapes, and other annotations are visual changes created by you. LocalSign does not verify, certify, notarize, or legally validate documents.