Free tool

Protect PDF

Add a password to a PDF so only people who have it can open the file. Uses AES-256 encryption, applied entirely in your browser.

1. Upload your file

Processed right here in your browser. We also keep a copy of what you upload, for support and to improve the tool.

Click to choose a file, or drag it here

PDF only, up to 30MB

Result

Upload a file to get started.

How it works

1. Upload your PDF — Choose the file you want to lock.
2. Set a password — Enter and confirm the password you want to protect it with.
3. Download — Get a password-protected copy, ready to share.

Processing happens in your browser — nothing is sent to a server to do the actual work. We also keep a copy of what you upload, for support and to improve the tool.