QR Code Size and Colors: Complete Optimization Guide
Proper sizing and color choices are crucial for QR code success.
QR Code Size Guidelines
Close range (30-50 cm): Minimum 2x2 cm
Medium range (1-2 m): Minimum 5x5 cm
Far range (3+ m): Minimum 15x15 cm
Formula: QR code size = scanning distance ÷ 10
QR Code Color Guidelines
Best combinations: Black on white, dark blue on white, white on dark background
Avoid: Low contrast, gradients, transparent backgrounds
Requirement: Minimum 70% contrast between foreground and background