# PDF Form Builder — Add Fillable Fields to Any PDF

> Place real text fields and checkboxes onto a PDF so other people can fill it in.

To turn a flat PDF into a form other people can fill in, drag text fields and checkboxes onto the page where each answer belongs and give them names. The result is a real AcroForm — the same interactive form Acrobat produces — so it can be completed in any PDF reader, in a browser, or with the Fill PDF Forms tool here. Field appearances are generated as the form is built, which is the step most tools skip and the reason a filled form so often saves blank.

**URL:** https://convertto.tech/t/pdf-form-builder
**Category:** PDF Tools (https://convertto.tech/c/pdf-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Produces:** A real AcroForm that any PDF reader can fill in
- **Fields:** Text fields and checkboxes, each with its own name
- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Select your pdf file — the file stays on your device and is never uploaded.
2. Enter or paste your fields.
3. Turn "Lock the fields" on or off as needed.
4. Set the quality.
5. Press Run, then download the result when it is ready.

## FAQ

### Why do field names matter?

The name is how anything reading the completed form identifies the answer — your own script, a database import, or the Fill PDF Forms tool. Two fields sharing a name means one answer overwrites the other, so duplicates are rejected rather than silently accepted.

### Should I lock the fields?

Not on the form you send out — flattening turns the fields into fixed page content and nobody can fill it in. Locking belongs at the other end, once the form comes back completed.

### Can I add dropdowns or radio buttons?

Not yet — text fields and checkboxes cover the large majority of forms. Dropdowns and radio groups need an option list per field, which is a different editing surface rather than another drag.

## Related tools

- [Fill PDF Forms](https://convertto.tech/t/fill-pdf): Read a PDF's interactive form fields, fill them in, and optionally lock the answers.
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