What Fill PDF Form does
Upload a PDF that contains interactive form fields and the tool lists every field by name — text boxes, checkboxes, dropdowns and radio groups — with its current value. Fill them in, choose whether to keep the fields editable or flatten them into the page, and save. It works for tax forms, applications, registration sheets and any other AcroForm PDF, entirely in your browser: the completed form, with whatever personal details it contains, is never uploaded.
Field types supported
| Field | How it appears here | Notes |
|---|---|---|
| Text field | Text box | Multi-line fields accept line breaks |
| Checkbox | Checked / Unchecked selector | |
| Dropdown (combo box) | List of the PDF's options | Custom entries are not supported |
| Radio group | List of the group's options | One choice per group |
| Signature field, buttons | Shown as unsupported | Left unchanged; use Sign PDF for a visual signature |
Field names are whatever the form's author called them — sometimes descriptive (applicant_name), sometimes cryptic (f1_02). Open the PDF in the PDF Viewer alongside to match names to boxes if needed.
Keep editable or flatten?
- Keep fields editable when the form goes to someone else who may need to correct it, or when the recipient's system reads field values programmatically (many tax and HR systems do).
- Flatten when the form is final: the values become ordinary page text, cannot be changed accidentally, and display identically in every viewer, including ones that ignore form appearances. Flattening is also what you want before signing or archiving.
Why some PDFs show no fields
Only PDFs with an AcroForm layer are fillable. A form that was scanned, printed to PDF, or designed as a static layout has boxes drawn on the page but no fields behind them — the tool reports “no fillable form fields”. For those, the options are: type over the page in a PDF editor, or print and fill by hand. XFA forms (some older government forms built in LiveCycle) use a different technology that browsers cannot fill; Acrobat Reader is needed.
Common uses
- Tax and benefit forms distributed as fillable PDFs.
- Job, school and visa applications.
- Client intake and consent forms for clinics and practices.
- Order forms and purchase requisitions.
- Completing a form on a device without a PDF application.
Tips
- Values you type are set exactly; a field with a character limit or a required format is not validated here — check the form's instructions.
- Pre-filled values load from the file, so you can update an existing filled form rather than starting over.
- After filling, run Sign PDF if a signature is needed, then Protect PDF if it contains sensitive data.
- Keep the original blank form; the tool never modifies it.