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PDF Forms
PDF Forms fills the interactive form fields inside a PDF with the values you supply, then saves the filled document. It never invents values: run it once with an empty field list and it reports every field name the document actually contains so you can copy the exact spelling.
How to use PDF Forms
- Upload the fillable PDF. If you are unsure of the field names, run it once with the values box empty to list them.
- Enter one value per line as Field name = value; checkboxes accept yes or no, dropdowns accept the exact option text.
- Run the tool again to write the values and download the filled form.
Where PDF Forms is useful
- Completing a supplier or tax form without printing it.
- Pre-filling the same fields on a batch of identical forms.
- Setting dropdown and checkbox values that are fiddly to click on screen.
Formats, algorithms and limits
Values are written into the document's AcroForm fields, which stay editable by design — the tool does not flatten them. Text fields take free text, checkboxes accept yes/no style values, and dropdowns or radio groups need the exact option label as defined in the form.
Troubleshooting and honest limits
- Field names are case-insensitive and must match what the form defines — the empty run prints the exact list.
- If a field refuses a value, open the form in a reader and check the option labels for that dropdown or radio group.
- Run Flatten PDF afterwards if you need to lock the completed values so they cannot be edited.
Frequently asked questions
Does it fill fields automatically?
No. The tool writes only the values you provide. An empty run is a safe inspection step that lists the available field names without changing anything.
What if the PDF has no fillable fields?
It reports that clearly and stops. Use Edit PDF to type onto a flat, scanned or printed form instead.
How do I set checkboxes?
Use a line like 'Agree to terms = yes' to tick the box, or '= no' to clear it. The tool recognises common affirmative values.
Are the filled values saved securely?
Everything happens in your browser; the filled PDF is generated locally and your values are never uploaded.
Related tools
Page written and reviewed by the FreeConvertio engineering team on 2026-10-14. PDF Forms runs entirely in your browser — no uploads, no account and no daily limits.