A form sent as a PDF is usually a real form — the boxes are objects in the file, not lines drawn on a page — and it can be typed into rather than printed and filled by hand.
Fill a PDF form →Free every day without an account on some tools. Your file is deleted the moment the job finishes.
The boxes are read out with their names and types, so you can see what the form is asking for before you start. Once filled, the values are written into the page by default: left in the form layer they are invisible in most phone previewers, and somebody receives what looks like an empty form.
Yes. The form fields already in the PDF are listed with their names and current values.
Yes.
Yes — the filled form can be flattened, which turns the answers into part of the page.