1. Why Mobile Document Photos Get Rejected by Official Portals
When photographing paper forms, utility bills, property deeds, or academic degrees on a desk, holding the phone at even a slight angle creates perspective distortion, dark hand shadows, or clipped corners.
ScanifyAI includes a real-time Scan Quality Check (measuring Laplacian sharpness, highlight glare, and shadow contrast) plus an interactive 4-Corner Perspective Crop canvas directly inside the preview panel.
2. Step-by-Step: Auto AI Crop + Manual 4-Corner Adjustment
Whether you use the Camera Scanner or upload an existing photo into Scan to PDF, Crop Document, or ID Card 2-in-1, you can adjust corners in seconds:
- Step 1: Click "Auto AI Crop" in the Live Preview toolbar to automatically detect the bright document paper boundaries against your desk surface.
- Step 2: If a corner of your paper has a stamp or faint border, click "Manual 4-Corner Crop" to open the interactive green polygon overlay.
- Step 3: Drag the 4 corner handles (TL, TR, BR, BL) to the exact four corners of your document or ID card.
- Step 4: Review the automated Scan Quality Check badge (Sharpness, Brightness, Glare) at the top of the crop panel.
- Step 5: Click "Apply 4-Corner Crop" to flatten and straighten the document into a clean rectangular A4 PDF.
| Setting | Recommended value | Notes |
|---|---|---|
| Sharpness Score | ≥ 22% Recommended | Hold phone steady 25–30 cm above document |
| Lighting & Glare | Indirect Daylight Best | Avoid direct overhead flash on laminated ID cards |
| B&W Photocopy Filter | Threshold 135 (Default) | Removes grey paper shadows for crisp laser printing |
Open the relevant ScanifyAI guide view or browse document and PDF tools.