Protect PDF with Password - Encrypt PDF (AES-256)
Lock a PDF with a password using AES-256 encryption and optionally block printing, copying or editing.
How to use Protect PDF
- Click Select and choose your PDF, or drop it anywhere on the page.
- Set the options in the panel on the right.
- Click Protect PDF. The result is created in your browser and downloads straight away.
Tip: Keep a note of the password; a lost password cannot be recovered.
Frequently asked questions
How strong is the protection?
AES-256 is the strongest encryption in the PDF standard.
Is Protect PDF free?
Yes. All 48 tools on Chutki are free to use, with no sign-up and no watermark added to your files.
Are my files uploaded to a server?
No. Your files are processed inside your own browser and never leave your computer, which makes the tool suitable for confidential and client documents.
Does it work on mobile?
Yes. It works in current versions of Chrome, Edge, Firefox and Safari on computers, tablets and phones. Very large files work best on a computer.