Fillable PDF form
Also known as: interactive PDF form, PDF form fields, AcroForm
A fillable PDF form is a PDF with interactive fields — text boxes, checkboxes, dropdowns, and signature areas — that you can type into and save directly, without printing. The form layout stays fixed while the field values are stored as editable data.
- A PDF with interactive, typeable form fields
- Field values are saved as editable data
- Can be flattened to lock answers into the page
Interactive fields vs flat pages
A standard PDF is a fixed image of a page; you cannot type on it. A fillable form embeds clickable form fields (the PDF standard calls them AcroForm fields) that accept input and remember it when you save.
This is why some PDFs let you tab between boxes and check options on screen, while others force you to print, write by hand, and re-scan. Fillable forms keep the whole process digital.
Filling and flattening
After completing a form you can keep the fields editable or flatten it, which merges your answers into the page so they can no longer be changed — useful before sending a final copy.
If a form has no interactive fields, or you just need to type onto any PDF, /tools/fill-pdf-form lets you add text and checkmarks anywhere on the page and export the result.