Password protect a PDF
Encrypt a PDF with a password (256-bit AES).
Send payslips, contracts or medical files safely. The PDF is AES-256 encrypted right on your device: only someone who knows the password can open it.
How to password protect a pdf in 3 steps
Add your file
Click “Select” or drag and drop the file. It stays on your device.
Password protect a PDF
Choose a password and permissions (print, copy, modify).
Download the result
Your file is ready in seconds, with no watermark and no sign-up.
Why use Protect PDF on PDF Atlas?
100% private
Your documents are processed in your browser and never uploaded.
Free & unlimited
No account, no watermark, no daily limit.
Fast
No upload time: results are instant.
Works everywhere
Computer, tablet or phone, on every system.
Frequently asked questions
Which encryption is used?
256-bit AES encryption, the highest level defined by the PDF standard.
What if I forget the password?
We never know it and cannot recover it. Keep it somewhere safe.
Is Protect PDF free?
Yes, the Protect PDF tool on PDF Atlas is completely free, with no sign-up, no limits and no watermark.
Are my files safe?
Yes. Processing happens locally in your browser: your files are neither uploaded nor stored on a server.