Inkspan › cURL

How to fill a PDF form in cURL

Use the Inkspan /v1/pdf/fill-form endpoint to fill a PDF form in cURL. It runs as a managed API — no headless-browser infrastructure, fonts, or scaling to maintain. Authenticate with your API key and send a single POST request.

cURL example

curl -X POST https://api.inkspan.dev/v1/pdf/fill-form \
  -H "X-API-Key: ink_live_..." \
  -F "file=@input.pdf" --output out

Notes

• Authentication: pass your key in the X-API-Key header.
• Pricing is usage-based; the free tier covers 100 documents/month.
• Extraction endpoints return a confidence score so you never ship false-certain data.

Related: generate a PDF from HTML · generate a PDF from a template · convert Markdown to PDF · merge PDF files