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How to Password-Protect a PDF

Sending sensitive documents like payslips, bank statements or contracts? Adding a password keeps them private so only people you trust can open the file. Here is how to protect a PDF for free without uploading anything.

Try the Protect PDF tool →

Why password-protect a PDF?

Email and chat are not always secure. A password means that even if a file ends up in the wrong inbox, the contents stay locked. It is a simple, strong layer of privacy for personal and business documents.

Step-by-step: protect a PDF

  1. Open the Protect PDF tool and add your file.
  2. Type a strong password.
  3. Click Protect to encrypt the document.
  4. Download your password-protected PDF.

Security tips

Use a long, unique password and share it through a different channel than the file itself — for example, send the PDF by email and the password by message. Keep an unprotected backup somewhere safe in case you forget it. To hide specific details rather than the whole file, use Redact PDF.

FAQ

Is it free to password-protect a PDF?

Yes, ACS PDF adds a password for free, and encryption happens in your browser.

Can I remove a password later?

Yes, if you have the rights to the file you can use Unlock PDF.

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