Protect PDF

Add a password to a PDF with strong AES-256 encryption. Everything runs in your browser — your file and password never leave your device.

Click to choose a PDF or drop it here

One PDF file

How to password-protect a PDF

Choose the PDF you want to protect.
Type a password (twice, to avoid typos).
Press Protect PDF — the encrypted copy downloads automatically.

Is it private?

Yes. The file is encrypted on your device with WebAssembly (qpdf) using AES-256. Nothing is uploaded — and if you lose the password, no one (including us) can recover the file.

Is it private?

Yes. Everything runs inside your web browser, using your own device. Nothing is uploaded to any server, so your documents stay completely private. How does this work without uploading?

Frequently asked questions

How strong is the encryption?

AES-256, the standard used for sensitive documents. The PDF cannot be opened without the password.

Is my file uploaded?

No. The encryption happens entirely in your browser, so your file and password never leave your device.