Font Size Detector
Calibrate with a known reference or run live page analysis to get pixel-perfect typographic scale for developers and designers.
Upload image / PDF
Drop your image here or click to upload
Supports JPG, PNG, WebP, GIF, PDF • Max 10MB (25MB for PDF)
✓ Runs locally in your browser — nothing uploaded
Or paste HTML/CSS directly — works for private pages.
Live Preview
Results will appear here
This is the extensible result shell. Future AI/API integration will populate:
- ● Match + confidence %
- ● Family, weight, style, category
- ● License / source (free, Google, Adobe)
- ● Live preview with your text
- ● Similar / alternative fonts
- ● Next actions: download, buy, test, copy CSS
Architecture ready for pluggable AI providers — UI not coupled to a single API. Swap provider via env.
How it works
Provide reference
Upload image with known height or set scale.
Measure
We compute cap-height → font size mapping.
Export
Copy CSS with fluid scale.
FAQ
Accuracy?
Within ~5% from high-res images; exact from live DOM.
Privacy note
Heavy image/PDF processing stays in your browser when possible. No fonts or files stored.