How to Fill Out a PDF Form on iPhone
Filling a PDF on a phone, including scanned forms with no real fields — what iOS does natively, where it falls down, and how to keep the result looking properly filled in.
There are two completely different things people mean by "filling out a PDF", and confusing them is why the process often feels harder than it should.
Interactive forms versus flat ones
An interactive PDF has real form fields built into it: tap a box and a cursor appears. These are straightforward everywhere, including in iOS Files, because the document is telling the reader where text goes.
A flat PDF has no fields at all. It is usually a scan, or a document exported from a word processor, and the boxes you can see are just lines printed on the page. Tapping them does nothing, because as far as the file is concerned they are not boxes. Most forms that land in an inbox are this kind.
Filling a flat form
- Open the PDF and check whether tapping a field gives you a cursor. If it does, it is interactive — just type.
- If nothing happens, you need to place text on top of the page rather than into it.
- In Markup, use the text tool and drag each box into position. Workable for two or three fields.
- For a longer form, use a filler that lets you tap a spot and type, and that keeps a consistent font size across every entry.
- Add the date and any tick marks the same way.
- Sign last, so you can check the rest before committing.
- Export and share back — Mail, Messages or Files.
Making it look filled in rather than annotated
The tell of a badly filled PDF is inconsistency: text at four different sizes, entries sitting above the line rather than on it, a signature scaled larger than the box. Keep one text size for every field, align to the printed line rather than the box centre, and size the signature to sit inside its box with room around it. It takes a minute longer and it is the difference between a form that gets accepted and one that comes back.
Before you send it
- Every required field has something in it, including the ones on later pages.
- Dates are in the format the form asks for, which is not always the one you use.
- The signature is yours and is in the signature box, not the print-name box.
- You are sending the flattened, signed export rather than the original file.
Questions
- Why can't I type into my PDF on iPhone?
- Almost certainly because the PDF is flat — a scan or an export with no interactive form fields. The boxes are printed lines, not inputs. You need to place text on top of the page instead.
- Can I fill out a PDF without Adobe?
- Yes. Nothing about filling a PDF requires Adobe software; iOS Markup and third-party apps both do it, and neither needs an Adobe account.