Protect PDF

Add password protection to a PDF file. 100% client-side — your files never leave your browser.

Drag & drop your PDF here

or click to browse · PDF files up to 50 MB

What is PDF to Protected PDF Conversion?

PDF protection adds password encryption to PDF documents. FreeCVT protects PDFs using server-side pdftk encryption — files are automatically deleted after conversion.

Understanding the Formats

PDF Format

A PDF file that needs password protection.

Protected PDF Format

A password-protected PDF file that requires the password to open.

When to Use This Converter

Protect confidential documents
Add passwords before sharing
Secure sensitive PDFs for email

Limitations

Choose a strong password
Lost passwords cannot be recovered
Some viewers may not support encryption

Why Freecvt?

100% Private

Your files are processed in your browser. Nothing is uploaded to any server.

Lightning Fast

Password protection happens instantly in your browser.

Works Everywhere

Runs on any device with a modern browser. No installation required.

Frequently Asked Questions

What encryption is used?

AES-256 encryption, the industry standard.

Can I set different permissions?

Yes, you can set open password and permission password separately.

Is my data uploaded?

No. Your PDF is encrypted on our server and immediately deleted. We never store or review your files.