Password-protect a PDF
Encrypt a PDF with a password so only people you trust can open it. Encryption happens entirely in your browser — your file and password are never uploaded.
Drop a PDF to protect
or click to browse
Also on your phone
Protect PDF on the go
The free QuickPDF app puts this and 20+ other tools in your pocket — scan with the camera, sign with your finger, and ask AI what a document says. Most tools run on your device, so they keep working without a connection.
Free — requires iOS 13 or later.
Free on Android phones and tablets.
How to password-protect a pdf
- 1
Open your PDF
Drop your PDF above, or click to browse.
- 2
Set a password
Choose a strong password — you'll need it to open the file.
- 3
Protect & download
Click Protect PDF and download your encrypted file.
Frequently asked questions
How strong is the encryption?
The PDF is encrypted with standard PDF AES encryption — it can't be opened without the password.
Is my file uploaded?
No. Encryption runs in your browser; your file and password never leave your device.
I lost the password — can you recover it?
No. We never see your password and can't recover it, so store it safely.