How to fill out a PDF form on your phone
To fill out a PDF form on your phone, open the file in an app that lets you place text directly on the page, tap where each answer belongs, type it, add checkmarks and the date, then export a flattened PDF. No printer, no scanner, and no desktop round-trip required.
Start with whatever version of the form you have
All three of the usual starting points work the same way once the page is on your screen: a PDF someone emailed you, a paper form in your hand, or a photo of a form you took earlier.
- A PDF — save the attachment to your phone first, then import it. Downloading it out of the email app avoids the read-only preview that some mail clients use.
- Paper — capture it with your camera. Lay the page flat, fill the frame with it, and avoid casting a shadow over the middle. See how to scan a document to PDF with your phone for the details.
- A photo — a picture you already took works, as long as the text is sharp and the whole page is in frame.
In FormFill, those are the three actions on the home screen: Scan, Import PDF, and Photo.
Know whether your PDF is fillable or flat
Most forms people receive are flat, which means they look like a form but contain no interactive fields. A viewer that can only type into built-in fields will refuse to let you enter anything at all, and that is the point where people usually give up and print the page.
A fillable PDF has real form fields built in by whoever created it, so tapping a blank highlights a box and a keyboard appears. A flat PDF, a scan, or a photo has none of that. The way around it is an overlay: instead of relying on fields, you place your own text on top of the page wherever you want it, which works identically for both kinds of file.
Fill the fields in a sensible order
Work top to bottom and leave the signature for last, so you are not re-signing after a correction. Zoom in before placing anything small; it is far easier to position text accurately at 200% than to nudge it afterwards.
| Field on the form | What to place | What to watch for |
|---|---|---|
| Name, address, phone | Text | Sit the text on the printed line, not across the label above it |
| Yes/no and multiple choice | Checkmark or X | Some forms ask specifically for an X; read the instruction above the boxes |
| Dates | Date | Check whether the form wants MM/DD/YYYY or DD/MM/YYYY |
| Initials by a clause | Initials | Often one set per page or per numbered paragraph |
| Signature line | Signature | Sign last, after proofreading every other field |
In FormFill you tap anywhere on the page to drop text, a check, an X, or today's date, then drag to reposition and use the corner handle to resize. There are no fields to hunt for, which is why a scan of a paper form behaves the same as a PDF.
Keep it legible
Size your text to roughly match the printed text around it. Anything much smaller gets lost when the recipient prints the page, and anything much larger crowds into the next line.
A few habits that save a resend: keep every answer inside its own line or box, do not let text run over a printed label, and give boxes a checkmark that sits inside the box rather than straddling its edge. If an answer genuinely does not fit, abbreviate rather than shrinking the text to the point of illegibility.
Flatten the form before you send it
Flattening merges everything you added into the page itself, so the recipient sees exactly what you saw. It is the step that prevents most of the awkward "your form came through blank" emails.
Unflattened annotations and field values are stored as a separate layer, and different PDF viewers treat that layer differently. Some render it fine on screen but drop it when printing, some let the recipient move or delete what you typed, and some older viewers ignore it entirely. Once the page is flattened, none of that applies — it is one fixed image of the finished document.
FormFill does this when you tap Done: your filled form is flattened into a clean PDF, saved to your library, and offered to share by email, to Files, or anywhere else your phone can send it.
A last check before you hit send
- Every required field has an answer, including the easy-to-miss ones on the back page.
- Dates are consistent and in the format the form asked for.
- The signature is on the signature line, not the "print your name" line above it.
- All pages are included, in order, even the ones you left blank.
- Open the exported PDF once yourself before attaching it.
Fill and sign any form on your phone
FormFill turns any paper or PDF form into a fillable, signable document: scan or import it, tap anywhere to fill it in, drop a reusable signature, then flatten and send a clean PDF. Everything stays on your device.