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Tools · Protect a PDF

Protect a PDF

Encrypt your PDF with a password. The password never leaves your device.

Drop your PDF here
Choose a file
PDF · up to 100 MB

Processed on your device. Your files never leave it.

Add a password to your PDF, with no software. Encryption happens in your browser: neither the file nor the password is sent.

  • 100% client-side encryption: nothing is uploaded.
  • Password required to open.
  • Free, no sign-up.

See also

Unlock a PDF
Remove the password.
Redact a PDF
Permanently black out areas.
Blur an area
Hide a face, a plate, a name.
Remove metadata
Strip GPS, camera and date from a photo.

Frequently asked questions

How do I password-protect a PDF?
Upload your PDF, enter a password, then the tool encrypts the document. The downloaded file will ask for that password every time it is opened.
What type of encryption is applied to the PDF?
The PDF is encrypted so it can only be opened with the password you choose. Be sure to note this password, it cannot be recovered if lost.
Are my PDF or my password sent to a server?
No, the encryption happens entirely in your browser. Neither your PDF nor your password leaves your device, nothing is uploaded.
Do I have to pay or sign up to protect a PDF?
No, it is free, with no ads and no sign-up. You add a password to your PDFs in seconds.