PDF
Protect PDF
Add a password to a PDF, in your browser. File and password never leave the device.
Runs in your browser
Private
Free forever
How to use
Drop a PDF or click to choose
The total page count loads automatically. Already-encrypted PDFs are flagged so you know to unlock first.
Set a password and pick permissions
Pick a user password (required to open). Optionally set an owner password and choose which actions readers can perform.
Protect & download
The PDF is encrypted in your browser and the protected file downloads immediately. Your password is never sent anywhere.
Frequently Asked Questions
- Is Protect PDF free to use?
- Yes, Protect PDF is completely free. No account, no signup, and no payment is ever required.
- Does Protect PDF send my data to a server?
- No. Protect PDF runs entirely in your browser. Your data is never uploaded to any server — all processing happens locally on your device.