Protect PDF
Lock a PDF with a password.
Runs entirely in your browser. Verify it in your network tab.
Needed to open the file. There is no way to recover it if forgotten.
What this does
Encrypts the whole file with AES-256 using qpdf, the standard open-source PDF tool, compiled to run in your browser. The password is used on this page and nowhere else.
Limits
- A forgotten password cannot be recovered, by us or anyone. Keep it somewhere safe.
- Print and copy restrictions are honoured by mainstream PDF readers, but they are requests, not guarantees: some tools ignore them.
- The encryption engine (about 1.3 MB) downloads from this site the first time it runs.
Is this private?
Yes, and you can check rather than take our word for it. Open your browser's network tab and run the tool: your file never appears in it, because there is no server to send it to. The whole site is static files, plus the WebAssembly engine that does the work, which is served from this same domain.