Forms and signing

How to Fill Out a PDF Form (Even When It Is Not Fillable)

Updated 2026-09-17 · 2 min read

PDF forms come in two flavours: interactive ones with real fields, and flat ones that are just a picture of a form. Both can be completed properly without printing.

Here is how to tell them apart and finish either one cleanly.

PDFfont edits PDF text in the document's own embedded font — no white cover boxes.

Edit a PDF

Interactive forms

Click into a field and type. Tab moves to the next. Checkboxes, radio buttons and dropdowns behave as the author intended, and the values are stored as real form data — which matters when the recipient processes forms automatically.

Flat forms

If clicking a line does nothing, the form has no fields. Add your own: place text boxes on the lines, checkboxes in the squares, and match the size to the printed labels so the finished page looks typed rather than annotated.

Finishing up

Read the form back once before flattening, because flattened values cannot be edited. Then flatten, save and send. Keep the editable copy in case the recipient asks for a correction.

Frequently asked

Why can I not type in this PDF?

It has no interactive fields. Add text boxes over the blank lines instead.

Should I flatten before emailing?

Usually yes — it stops values being changed or lost in other PDF viewers.

Can I make a form others can fill?

Yes, add text fields, checkboxes, dropdowns and signature fields, then save it unflattened.

Try it on your own document

$1 for 7 days of unlimited editing and downloads, then $5 a month or $29.99 a year. Cancel anytime.

See pricing