Password Protect PDF - Secure with AES-256 Encryption

Encrypt your PDF with AES-256 password protection. Secure sensitive documents with industry-standard encryption.

Start 7-Day Free Trial

100% Private

Instant Processing

Browser-Based

Features

AES-256 encryption

Strong password protection

Industry-standard security

Prevents unauthorized access

Works with any PDF reader

Secure processing

How It Looks

Unprotected

Password Protected

How It Works

Upload your PDF file

Enter a strong password

Click Protect to encrypt

Download your secured PDF

Common Use Cases

Protecting confidential documents

Securing financial records

Sharing sensitive information safely

Meeting compliance requirements

Frequently Asked Questions

What encryption does PDFSub use?

We use AES-256 encryption, the same bank-level security used by financial institutions and government agencies.

Can recipients open the PDF on any device?

Yes, password-protected PDFs work with all standard PDF readers on any device, including Adobe Reader and Preview.

What makes a strong password?

Use at least 8 characters with a mix of uppercase, lowercase, numbers, and symbols. Avoid common words or personal information.

Can I remove the password later?

Yes, use our Unlock PDF tool to remove password protection. You will need to enter the original password.

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Ready to Protect PDF?

Your files stay private with secure processing.

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