Protect PDF
Lock a PDF with a password using AES-256 encryption. The password and file never leave your browser.
How to use
- 1Choose a PDF.
- 2Type a password twice. Optionally block printing or copying.
- 3Press Protect. Anyone opening the file will need the password.
Frequently asked questions
What encryption does this use?
AES-256, the same standard used by Adobe Acrobat and most enterprise tools.
Can I remove a password I forgot?
No — this tool only adds passwords. Without the original password there's no way to recover an encrypted PDF.
Does the password ever leave my browser?
No. Encryption happens locally on your device; the password is never sent anywhere.