Encrypt a PDF with a password so it cannot be opened by anyone who does not have it, using AES-256 — the strongest encryption the PDF format supports.
How to password-protect a PDF
- Choose a PDF.
- Set the password that will be required to open it.
- Download the encrypted PDF.
What happens to your file
- Never kept
- Your original is wiped the instant the conversion finishes.
- 60 minutes
- The result is deleted automatically — or the moment you say so.
- No watermark
- Nothing is ever stamped on your document.
- No sign-up
- Five conversions a day free; an account simply removes the limit.
Questions
How strong is the protection?
AES-256, the standard used for confidential files generally. The document cannot be opened without the password by anyone, ourselves included.
What happens if I forget the password?
The file cannot be recovered. There is no back door and no reset, so store the password somewhere safe before you send the document.
Is my password kept anywhere?
No. It is used for that one conversion and discarded along with the file.
What happens to the files I upload?
Your original is deleted the moment the conversion finishes, whether it succeeded or not. The converted file stays available for 60 minutes so you can download it, then it is deleted automatically. You can also remove it instantly with the Delete file now button.
Do I need an account, and is there a watermark?
No account is needed for five conversions a day, and a free account removes that limit. Nothing is ever stamped on your document — there is no watermark on any tool, signed in or not.
Does it work on a phone?
Yes. Everything runs in the browser on a phone, tablet or computer, with no app or plugin to install.