Password protect a PDF
Put a password on a PDF so only people you give it to can open it.
Your files never leave your device. Everything happens in this browser tab. Nothing is uploaded, and closing the tab erases it.
How it works
- Drop the PDF you want to lock.
- Type a password twice.
- Download the locked copy. Your original stays as it was.
Questions
Is my PDF or my password sent anywhere?
No. Both stay in your browser: the encryption runs on your device with qpdf, a long-standing open-source PDF tool.
How strong is it?
It uses AES-256, the strongest encryption PDF readers support. A long password matters more than anything else: use a few words, not a single one.
What if I forget the password?
Then the file can’t be opened, by you or by us. Keep the unprotected original, or store the password in a password manager.
Will it open everywhere?
Yes, in every current PDF reader: Acrobat, Preview on a Mac, browsers and phones ask for the password.
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