Sets a real AES-256 password on the file itself — not a note asking readers to be careful, encryption every PDF viewer enforces at open time. The same password you set is the one you or the recipient types back in.
This runs in your browser. The file is not uploaded, there is no account to create, and nothing is added to the document you download.
Also searched for: encrypt pdf, lock pdf, pdf password, secure pdf. It is the same tool whichever way you found it.
Real AES-256 encryption written into the file itself — the kind every PDF viewer enforces at open time, not a note asking readers to be careful. The password you set is the one that has to be typed back in.
Nobody can open it, including us — that is the point of encrypting it. Nothing is stored anywhere, so keep the password somewhere safe before you send the file on.
No. The file is opened, changed and written by this browser tab — it is never sent to a server, so there is no queue to wait in and nothing to delete afterwards. Once the page has loaded you can turn the network off and the tool still works.