Password Protect PDF

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

Lock PDFs with AES-256 encryption - bank-grade security.

or drop the pdf here

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.

Related PDF Tools

More tools you might find useful in the same workflow.

Unlock PDF →

Remove password from PDF

Redact PDF →

Permanently remove sensitive content

E-Sign PDF →

Add your signature to any PDF

Share Document →

Generate secure shareable links with expiry and view tracking

Add Watermark →

Add text watermark to pages

Stamp PDF →

Add professional stamps to your PDF

Browse all PDF tools →