How does PDF protection work?

This tool uses the high-performance MuPDF engine to add industrial-grade encryption to your PDF locally. It sets an open password and applies strict permissions to prevent unauthorized access.

Yes, all processing happens locally in your browser. Your PDF and password never leave your device. It works 100% offline.

What encryption is used?

The PDF is encrypted using standard PDF encryption algorithms (AES-256), which is honored by all major PDF readers like Adobe Acrobat and modern browsers.

Can I remove the password later?

You would need a PDF unlock tool and the original password to remove protection. Please keep your password safe as it cannot be recovered.

Protect PDF

Add password protection to your PDF files locally. Encrypt PDF with strong encryption to prevent unauthorized access.

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