Fill PDF Form — Free Online PDF Form Filler
Fill out any fillable PDF form — the tool detects text fields, checkboxes, dropdowns, and radio buttons automatically, so you can complete the form and download it right away. Everything happens locally in your browser using JavaScript — your PDF is never uploaded to a server, so it's safe to use for private, sensitive, or confidential documents.
How to use fill pdf form
- 1Upload a fillable PDF form (one with AcroForm fields).
- 2Fill in each detected field — text boxes, checkboxes, and dropdowns are all supported.
- 3Optionally flatten the form to make your answers permanent, then download the completed PDF.
Frequently asked questions
What if my PDF has no fillable fields?
This tool only works with PDFs that already contain fillable AcroForm fields. For a flat, non-fillable PDF, you'd need to overlay text manually — check FileKit's Fill Forms Online section for pre-built official government forms.
What does "flatten" mean?
Flattening converts your filled-in answers into permanent page content, so the form can no longer be edited — useful when submitting a final copy.
Are the field types auto-detected?
Yes — text fields, checkboxes, dropdowns, radio groups, and option lists are all detected automatically and rendered with the right input type.