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Lock PDF

Add password protection to any PDF file

🔒 Password-protect a PDF with real AES encryption

Add a password that must be entered to open the PDF. Uses genuine AES encryption — anyone without the password cannot read the file. Processed entirely in your browser.

Drop the PDF you want to password-protect

Supports: PDF, PDF · Max 50MB

Browser-based, files never uploaded Instant results Works on any device

How to use Lock PDF

  1. 1Upload your PDF
  2. 2Set a password
  3. 3Choose permissions
  4. 4Download the protected PDF

About this tool

Add password protection to your PDF files online. Set open password and permissions to control who can view, edit or print.

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Frequently asked questions

Is the encryption secure?

Yes — we use AES-256 encryption standard.