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Protect PDF

Add a password so only people you share it with can open the file.

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Drop a PDF here, or click to browse

One file at a time.

Encrypting...
✅
Your protected PDF is ready

🔒 Files are processed locally — never uploaded anywhere.

How to password-protect a PDF online free

  1. Drop a PDF into the box above.
  2. Enter and confirm a password.
  3. Click Protect PDF.
  4. Download protected.pdf — encrypted entirely on your device.

Frequently asked questions

What encryption does this use?

A real AES-128 password, applied with pdf-lib-with-encrypt — the same standard used by most professional PDF tools.

Do you store or see my password?

No — the password is used locally to encrypt the file in your browser tab and is never sent anywhere.

What if I forget the password I set?

There's no recovery — treat it like any password. If you lose it, the PDF can't be opened. Use Unlock PDF only if you already know the password.

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