How do I fill and sign a PDF?

A form is rarely just a signature. It wants your name, an address, a date, a choice from a list, maybe a tick to say you have read something, and then your signature at the end. Splitting those into two separate tools is an accident of how software grew up, not how a form works. Here they are one page. The fields sit on the document, and the signature is placed on it like everything else.

The tool reads a PDF’s own form fields and lays real inputs over them, sized and positioned exactly where the form drew them. If some fields already hold answers, those show up too, so a document that arrived half-filled opens half-filled.

Plenty of PDFs only look like forms. A scan, or a file exported as a flat page, has no fields at all, so there is nothing to type into. That is not a dead end. Choose Text, Date, Tick or Signature and place them anywhere on the page, exactly as you would with a pen. The tool looks for a form and uses one when it exists. Otherwise the free-placement tools take over.

If you expected fields and found none, you may have the wrong version of the file. Organisations often publish a blank scan on a web page and the real, fillable form behind a download link.

You decide what the file becomes. Keep the fields live and the answers stay editable, which suits a form that is still on its way to somebody else. Flatten it and every answer is drawn into the page, so it looks the same in any viewer and cannot be changed afterwards, which suits a finished document.

Either way the changes are added at the end of the PDF rather than rewriting it, so a digital signature already in the document is left intact. All of it happens in your browser, so the completed form never leaves your device.