How to password-protect a PDF
- Open the PDF you want to protect.
- Enter a password twice.
- Click Protect PDF to download the encrypted file.
Frequently asked questions
How secure is it?
The PDF is encrypted with AES-256, the strongest standard PDF encryption, supported by Adobe Acrobat, Chrome, Edge and macOS Preview.
Is my password sent anywhere?
No. Encryption runs in your browser, so neither the file nor the password leaves your device.
What if I forget the password?
It can’t be recovered, so store it somewhere safe or keep an unprotected copy.