Protect PDF

Password-protect a PDF file.

Encrypt a PDF with a password to control who can open, print and edit it. Set a user password and optional permission restrictions — all done locally in your browser.

How to use

01

Select a PDF

Choose the PDF you want to protect.

02

Set passwords

Enter a user password (needed to open) and optionally an owner password for permissions.

03

Choose permissions

Decide whether printing, copying and modifying are allowed.

04

Protect and download

Click PROTECT, then download the encrypted PDF.

Features

Real AES/RC4 encryptionFiles are encrypted with standard PDF encryption so viewers enforce the password.

Two passwordsUser password to open, owner password to control permissions.

Permission controlsRestrict printing, copying and editing.

Local encryptionEncryption keys are generated and applied in your browser.

Privacy & security

Encryption happens locally. The password and the file never leave your device.

Limitations

PDF passwords limit casual access; determined attackers can attempt to crack weak passwords — use a strong one.
If you lose the password, the file cannot be opened. There is no recovery.

Frequently asked questions

The PDF standard's strongest supported encryption is applied (AES-256 where supported by the library).

The file cannot be opened — keep your password safe. There is no backdoor.

Yes — use Unlock PDF with the password you set.

Yes, free with no account.

Related tools

View all tools

Unlock PDF

Remove a password you know from a PDF.

Use tool Remove PDF Password

Save a protected PDF without a password.

Use tool Check PDF Security

Inspect a PDF's protection and permissions.

Use tool