Forms and signing

How to Fill In a certificate PDF

Updated 2026-09-17 · 2 min read

The usual reason to fill in a certificate PDF is a recipient name or award date that has to be reissued.

A PDF form either has real interactive fields or it is a flat picture of a form. Both can be completed properly without a printer.

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

Steps to fill in a certificate PDF

Open the file and click a blank. If a cursor appears, the form is interactive — type and tab through the fields.

If nothing happens, the form is flat: add your own text boxes on the ruled lines and checkboxes in the squares.

Match the size and colour of your entries to the printed labels so the page looks typed rather than annotated.

Read it back, flatten, and save.

With this kind of document, display and script faces make substitutions obvious, so the embedded font must be reused.

One caution worth stating plainly: reissuing your own organisation's certificates is fine; altering someone else's qualification is forgery.

Flattening stops values being cleared or altered by whichever reader the recipient opens it in.

It has no interactive fields; add text boxes over the lines instead.

Usually yes, unless the recipient reads form data automatically.

Yes. The editor runs in mobile Safari and Chrome, with touch-sized controls and a share sheet for saving the finished file.

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