Password-protect a PDF with AES 128- or 256-bit encryption. Recipients must enter the password to open it — ideal for contracts, payslips and confidential files.
How to Protect PDF online
- 1Drop your file or click to select it (up to 10 MB).
- 2Set the options for “Protect PDF” and click Run.
- 3Download the result. Your files are deleted automatically.
Frequently asked questions
What's the difference between 128 and 256 bit?
AES-256 is the strongest standard; AES-128 keeps compatibility with very old PDF readers.
Can I block printing or copying?
Yes — the protected PDF allows printing but blocks content modification by default.
What if I forget the password?
We keep neither files nor passwords, so store it safely.