Document Scanner
Drop a phone photo of a receipt, invoice, or printed page. Drag the four corners onto the document edges. Get a clean flat scan back — JPG or PDF, ready to send.
The perspective transform, filter, and PDF generation all happen on this page in your browser. Your photo is never uploaded.
FAQ
Is my document uploaded?▼
No. The whole pipeline — corner editing, perspective transform, B&W enhancement, PDF generation — runs in your browser. The photo never leaves your device.
How accurate is the perspective correction?▼
It uses a proper homography (3×3 projective transform) — the same math used by OpenCV's getPerspectiveTransform. As long as you drag the four corners onto the document edges, the output is a flat rectangular view, even from steep angles.
What output do I get?▼
A clean rectangular scan. Download as JPG, PNG, or single-page PDF. The PDF is sized to A4 portrait with the scan centred and fitted.
Why isn't there auto-edge-detection?▼
Edge detection from arbitrary phone photos is unreliable on cluttered backgrounds. Dragging four corners takes ~5 seconds and works every time. Auto-detect is on the roadmap.
Which filter should I pick?▼
Use B&W scan for receipts, invoices, and printed pages — it kills shadows and uneven lighting. Use Grayscale for handwritten notes you want softer. Use Original to keep colour photos.
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