Somebody has a form. It exists as a printed sheet, or a scan of one, or a design exported from a layout program, and every person who needs to complete it currently prints it, writes on it, scans it and emails it back. Making it fillable removes all four of those steps.
The work is placing the fields. You draw a box where a field should sit — over the line for a name, the empty square for a tick, the space for a choice — and it becomes a real fillable field there. It lands on the page you drew it on, at the size you drew it, and it sits on top of whatever is underneath, so a scan of a printed form works exactly as well as a born-digital one.
There are six kinds. A text box, which can start with a value already in it and can run to several lines for an address or a note. A checkbox, which can start ticked or empty. A dropdown and a list — the list can allow several answers at once. Radio options, which join into one group so choosing one unchecks the rest. And a signature box, an empty place a signer writes into later. Any field can be marked needed, and most can repeat on every page. Numbered pins on each field set the tab order, and the fields list shows the same numbers — there is one order, shown in both places.
Two fields of the same kind may share a name. The format treats them as one field — they always show the same answer — so the tool flags it before you add, and adding is still allowed because that is exactly how a radio group works and occasionally what you want elsewhere. A name already held by a different kind can’t be shared, and the tool explains that instead of failing later.
What comes out is a genuine PDF form: standard fields that Acrobat, Preview, a browser or a phone can all fill in. If you later want the answers locked so nobody can change them, that is the flatten step, kept separate on purpose.
Free, no signup, no limit on fields or pages, and nothing uploaded.