QR Code Best Practices
100% Trinh Duyet
Mien Phi
Khong Dang Ky
Tai Ngay
Them Trinh Tao QR
Size
Minimum 2×2 cm for close scanning. Scale up for distance (10× viewing distance = 10× code size).
Contrast
High contrast only. Dark on light works best. Avoid low-contrast combos like yellow on white.
Quiet Zone
Leave a 4-module white border. Do not place text inside this border.
Always Test
Scan with multiple devices before printing. A code that works on your phone might fail on others.