How does PDF password protection work?

Your PDF is encrypted using AES-256 encryption with your chosen password. Only those with the password can open the PDF.

Can I set different passwords for opening and editing?

Yes, you can set separate passwords for opening the document and for making changes to it.

Is this password protection tool free?

Yes, completely free with no signup or registration required.

Is my PDF secure during protection?

Absolutely. All encryption happens in your browser - your PDF never leaves your device.

What encryption standard is used?

We use industry-standard AES-256 encryption to secure your PDF files.

Protect PDF

Secure your PDF documents with password protection. Encrypt sensitive information instantly in your browser.

How to Use This Protect PDF

1Upload your PDF file
2Enter a strong password
3Select encryption level (optional)
4Download your protected PDF

Features

✓Add password encryption to PDFs
✓AES-256 encryption standard
✓100% client-side processing
✓Protect sensitive documents
✓No file size limits

What is Protect PDF?

A free online tool that adds password protection to PDF files using strong AES-256 encryption. Ideal for securing confidential documents, contracts, or any sensitive information before sharing. All encryption happens locally in your browser for maximum privacy.