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QR Code Reference
Error Correction
- L (7%) - Smallest size
- M (15%) - Balanced
- Q (25%) - More reliable
- H (30%) - Most robust
Best Practices
- Test before printing
- Use high contrast colors
- Leave quiet zone margin
- Keep URLs short
Capacity
- Numeric: ~7,000 chars
- Alphanumeric: ~4,200 chars
- Binary: ~2,900 bytes
- Shorter = faster scan
Use Cases
- URLs and links
- WiFi network sharing
- Contact information
- Payment details