Protect PDF
Add password protection to a PDF using strong AES-256 encryption. 100% processed in your browser. Your file and password never leave your computer.
⚠️ Limit: File must be under 50MB. Remember your password — there is no way to recover it, for you or for us.
Frequently Asked Questions
What encryption does this use?
AES-256, the same encryption strength used by Adobe Acrobat and most professional PDF tools. The password is required to open the file in any standards-compliant PDF reader.
Is my file or password uploaded anywhere?
No. Both stay in your browser the entire time. Encryption happens locally using a PDF engine (MuPDF, compiled to WebAssembly) that runs entirely on your device — nothing is sent to a server.
What if I forget the password?
There's no way to recover it — not by you, and not by us, since we never see it in the first place. Store it somewhere safe before closing this tab.