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Security

Protect PDF

Add AES-256 encryption to your PDF so that anyone who opens it must enter a password. Set a user password (required to open), an optional owner password (controls editing and printing permissions), and fine-grained permissions such as allowing printing but preventing copying. Uses the pdf-lib encryption API. Your file never leaves your browser.

  • Files never leave your device
  • Runs entirely in your browser
  • Free, no account needed
Use Protect PDF - free

Frequently asked questions

What encryption standard is used?

AES-256 - the same standard used by professional PDF tools and mandated for high-security document workflows. It is part of the PDF 1.7 specification.

Can I allow printing but prevent copying of text?

Yes. The owner password controls a set of permission flags including printing, content copying, annotation, and form filling. You can enable or disable each independently.

Can I remove the password later?

Yes - use the Unlock PDF tool and enter the password you set to produce an unencrypted copy.

Lock your PDF with AES-256 encryption - free, runs locally.

Open Protect PDF
  • Files never leave your device
  • No upload required
  • No account needed
  • Unlimited use, always free

Related tools

Unlock PDF

Remove the password from a PDF you own.

Redact PDF

Permanently black out sensitive content in a PDF.

Sign PDF

Draw or type a signature and place it anywhere on your PDF.