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title: PDF Field Detector
emoji: 📋
colorFrom: blue
colorTo: green
sdk: docker
pinned: false
---
# PDF Field Detector
FastAPI service that detects form fields in PDFs.
- **AcroForm PDFs**: extracts native widget positions
- **Flat vector PDFs**: mines drawing layer for checkboxes, underlines, rectangles
- **Scanned/image PDFs**: returns `needs_ml` signal for FFDNet fallback
## API
`POST /detect` — multipart form upload, returns JSON with field boxes as fractions 0..1.
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