Developer tool
Inspect a PDF's form fields
Drop a PDF to list every AcroForm field — name, type, options — then
copy a ready-to-POST fields JSON and the exact API call
to fill it. No signup. Field detection runs in your browser.
Working with a government form? Its schema may already be in the
form compatibility registry.
Drop a PDF here, or
No PDF handy?
Fields
| Field name | Type | Options | Current value |
|---|
Ready-to-POST fields JSON
{}Fill it with the API
Swap in your values, grab a free API key, and you're filling PDFs from your own webhook or cron. Prefer a visual filler? Try the playground.
This PDF has no AcroForm fields to list. The Inspector reads fillable form fields — try a fillable PDF or our sample invoice. Got a flat PDF that should be fillable? Draw the fields onto it — free, in your browser. Need to combine files instead? Merge PDFs in the playground.
Field detection runs entirely in your browser (pdf.js) — nothing is
uploaded until you call the API. Read the
fill-form API docs — and when you need
the same field list server-side, that's
POST /api/inspect. Filling
from code? Guides for Python,
Node.js, and
JavaScript. No code at all?
Email the blank form + values to
fill@pdfops.dev — the reply is the filled PDF.