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Protect PDF

Password protect and secure your PDF.

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Your tools become available as soon as a PDF is in the workspace.

How to Password Protect a PDF

Add password protection to any PDF file with SnapPDF AI's free online PDF protector. Enter a password, and your PDF will be encrypted so only authorized users can open it.

Key Features

  • 256-bit AES password encryption
  • Set a custom password of your choice
  • Works on all PDF readers
  • Instant processing and download
  • No software installation needed

Frequently Asked Questions

Q: How secure is the password protection?
A: When qpdf is available on the server, we use 256-bit AES encryption — the industry standard for PDF security.
Q: Can I remove the password later?
A: You would need the original password and a PDF editor or tool that supports password removal.
Q: Is this service free?
A: Yes, PDF password protection is completely free.