Protect PDF

Lock your PDF with a password. We apply real 256-bit AES encryption right in your browser — the password never leaves your device. Free and unlimited.

How to protect pdf

  1. Add the PDF you want to protect.
  2. Choose a password (and an optional owner password for permissions).
  3. Click Protect PDF — your encrypted file downloads.

How strong is the encryption?

We use 256-bit AES, the same standard used by banks and governments. The file genuinely requires the password to open — it is not just hidden.