Protect PDF

Encrypt your PDF with a password to keep sensitive data confidential.

What Protect PDF does

Protect PDF encrypts a document with a password, so that opening it requires the password you set. Encryption uses AES-256, the current standard, and is applied before the file ever leaves the tab — which means the unencrypted version never exists anywhere except your device.

How to protect pdf

  1. Select the PDF you want to protect.
  2. Type the password you want to require.
  3. Press Protect PDF and download the encrypted file.

Privacy

Encryption runs in the tab. The password and the document never leave your device.

Questions

What encryption is used?

AES-256, applied by pdf-lib inside the browser.

Can I protect a PDF that is already protected?

Unlock it first, then protect the unlocked copy with a new password.

What happens if I forget the password?

There is no recovery. The file cannot be opened without it, by us or by anyone else.