Protect a PDF with a password, free
Add an open password to a PDF so it can only be opened by someone who knows it. Everything happens in your browser — your file and password are never uploaded.
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 Protect PDF tool and choose a PDF.
- Enter a password and confirm it.
- Click Protect & download.
- Save the password-protected PDF.
Good to know
- Keep your password safe. LocalSign cannot recover it.
- If you lose the password, the PDF cannot be opened or recovered.
- Already-encrypted PDFs are not re-protected; remove the existing password first.
FAQ
Is my password stored?
No. The password is used in your browser only and is never stored, logged, or uploaded.
Can LocalSign recover my password?
No. Keep your password safe — LocalSign cannot recover it if you lose it.
Is the file uploaded?
No. The PDF is encrypted locally in your browser and never leaves your device.
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.