Protect PDF
Add a password so opening requires it.
- 1Upload
- 2Options
- 3Process
- 4Download
Drop a file here, or browse.
PDF only · processed in your browser
Protect PDF applies an open password with AES in the browser on this device. The password is not sent anywhere and cannot be recovered from this site if you forget it.
This tool is free to use.
Files stay on this device.
How to password-protect a PDF
- Upload one PDF.
- Type a password of at least 4 characters and confirm it.
- Download the protected PDF and store the password yourself.
Protect PDF FAQs
Does the file leave this device?
No. The password is applied locally.
Can the password be recovered?
No. FileLabs never sees the password. If you lose it, this site cannot unlock the file.
How is this different from Unlock?
Protect adds a password you choose. Unlock removes a password only when you already know it.
Page guide updated 2026-09-26