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Password-protect a PDF

Type a password twice and download a PDF encrypted with AES-256 that only opens with it. Encryption happens in your browser, so neither the file nor the password is sent anywhere.

Good to know

  • Works with PDFs up to 25 MB that do not already have a password.
  • If you lose the password there is no way to recover the content: TodoToolsOnline does not store it.
  • Most readers respect the print, copy and edit permissions, but they are not a real barrier; the opening password is what protects the file.
  • Open the resulting file to check that it asks for the password.

Full guide to the tool: Protect PDF.

Frequently asked questions

Is my PDF or password sent to a server?

No. Encryption happens in your browser, and neither the file nor the password leaves your device.

What if I forget the password?

The content cannot be recovered: the tool does not store the password. Keep a copy of the original unprotected PDF somewhere safe.

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