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Playground demo key · api.reefapi.com
post/file-convert/v1/pdf_fill_form1 credit

AcroForm filling. Without 'fields' → lists the form fields (discovery). With 'fields' → fills and returns the PDF (NeedAppearances set). Output delivery: each produced file ≤10MB comes inline as base64 (files[].file_b64); 10-50MB comes as a one-time download token (files[].download_path, 30min TTL); >50MB total is rejected.

Working example
Parameters
No parameters — just send.
request preview
curl -X POST https://api.reefapi.com/file-convert/v1/pdf_fill_form \
  -H "x-api-key: $REEF_KEY" \
  -H "content-type: application/json" \
  -d '{"file_b64":"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"}'

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Playground · ReefAPI