Protect PDF — Add Password Encryption to Your PDF

Secure your PDF with a password to prevent unauthorized access. Set a password and encrypt your PDF instantly. Free, browser-based.

✓ Free✓ No Signup✓ Browser-Based✓ Privacy First

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Drop your PDF here

or click to browse · Max 50MB

How to use Protect PDF — Add Password Encryption to Your PDF

Upload your PDF
Enter a strong password
Click Protect PDF
Download the encrypted file

Frequently Asked Questions

What encryption is used?

AES-256 bit encryption via the PDF specification.

Can I set a strong password?

Yes, use any combination of letters, numbers, and symbols.

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