Fill government forms by the thousand — programmatically

Reuse the exact PDF forms your authorities require. Fill with JSON data, flatten to read-only, archive in PDF/A. AcroForm and XFA both supported.

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Hosted in Frankfurt & Paris
GDPR-compliant

AcroForm + XFAFlatten to read-onlyPDF/A archive

Why automate government forms with pdf.xhub?

Use the official template, no recreation

Government forms come as fillable PDFs. We fill the actual file the authority published — no risk of layout drift, no re-validation by legal.

AcroForm and XFA both supported

Modern AcroForm and the legacy XFA spec (used by IRS, Canadian gov, German Finanzämter, etc.) — same endpoint handles both.

Flatten + archive for audit trail

After filling, optionally flatten the form (read-only, no edits possible) and wrap in PDF/A-3 for a tamper-evident long-term archive.

How form filling works

1. Upload the source form once

Drop the source PDF into your workspace via dashboard or API. We extract field names and structure, store the template by ID.

2. POST JSON for each form fill

Reference the form by ID, pass JSON keyed by field name (or position). Conditional fields evaluated server-side.

3. Receive filled PDF (optionally flattened)

Get the filled PDF back inline. Optional flatten step renders fields to read-only. Optional PAdES signature for tamper evidence.

For HR, payroll, tax, and compliance teams

From W-9 / W-8BEN to German Anlage-N, French formulaires, social-security applications — any fillable PDF is automatable via the PDF Form Filling product. Field validation errors return clear JSON, not silent corruption.

Try it in your stack

Same endpoint. Copy as cURL, call from any language.

POST a JSON of field values to a form template, receive a filled PDF.

curl -X POST https://api.pdf.xhub.io/v1/render \
  -H "Authorization: Bearer $PDFXHUB_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "source": "form",
    "formId": "form_W9_2026",
    "data": {
      "name": "Acme GmbH",
      "taxId": "DE123456789"
    },
    "flatten": true
  }' --output filled.pdf

curl -X POST https://api.pdf.xhub.io/v1/render \
  -H "Authorization: Bearer $PDFXHUB_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "source": "form",
    "formId": "form_W9_2026",
    "data": {
      "name": "Acme GmbH",
      "taxId": "DE123456789"
    },
    "flatten": true
  }' --output filled.pdf

Features at a glance

Form support

AcroForm spec (modern PDF forms)
XFA spec (legacy government forms)
Field-name + index-based filling
Conditional fields (show/hide via JSON)
Checkbox, radio, dropdown, text, signature fields
Image insertion for signature fields

Output & Archive

Flatten step (convert fillable → read-only)
PAdES digital signatures (B, T, LT)
PDF/A-1b, PDF/A-2b, PDF/A-3 archive modes
Validation errors with clear field-level messages

Platform

EU-only render workers
AcroForm + XFA spec — same endpoint handles both
Field-level validation errors as structured JSON
Form versioning for audit-trail
Webhook on flatten / signing completion
Rate limit up to 1,500 req/min on Business

Powered by these APIs

The product endpoints behind this solution.

PDF Form Filling

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Automate your first form-filling pipeline

25 fills/month free forever. Reuse your authority-approved templates.

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