Protect PDF
Add a password to a PDF with 256-bit AES encryption.
Loading tool
This tool runs in your browser. Nothing is uploaded.
About Protect PDF
Protect PDF encrypts your document with AES-256, the strongest encryption in the PDF standard. Anyone opening the file must enter the password you set.
For payslips, medical letters, contracts and anything that travels by email.
What it does
- AES-256 encryption
- Optional printing and copying permissions
- Passwords are used only for this job and never stored or logged
How to use Protect PDF
- Upload a PDF.
- Enter the password people will need to open it.
- Choose permissions.
- Select Protect PDF and download.
Frequently asked questions
Do you keep my password?
No. The password is passed to the encryption step for this one job and is not saved, logged or sent to analytics.
What if I forget the password?
There is no recovery. Keep a copy of the unprotected file or store the password safely.
Limits and privacy
Permission flags are honoured by standard PDF readers but are not enforced by every program.
Everything happens on your device, so your content never reaches our server.
Processing speed depends on your device. Files up to 100 MB are supported; very large documents work best on a computer.