Protect PDF

Add a real password to your PDF using AES-256 encryption — computed entirely in your browser via a WebAssembly build of qpdf, the same engine most desktop PDF tools rely on.

Drag and drop your file here

or click to browse

Related tools

Unlock PDF

Remove a known password from a PDF.

Frequently asked questions

Is this real encryption, or just a display lock?+

It's real AES-256 PDF encryption — the file genuinely cannot be opened in any PDF reader without the password, not just hidden behind a UI.

Does my password get sent anywhere?+

No. The password and file are processed entirely in your browser using WebAssembly — nothing is uploaded.

What if I forget the password?+

There's no recovery — that's the point of real encryption. Keep your password somewhere safe.