QR scanners read reflectance, not ink color names. A navy code on cream paper can work; yellow on white often fails. The rule is contrast, not monochrome.
Safe customization guidelines
- Keep dark modules noticeably darker than background
- Do not invert to white modules on black without testing
- Preserve square finder patterns in high contrast
- Increase error correction if placing a center logo — EC levels
Common failures
- Pastel-on-pastel brand palettes
- Gradients crossing module boundaries
- Rounded corner styles that clip quiet zone
- Red codes on red packaging with glossy finish
Test protocol
- Scan on screen at 100% zoom
- Print desktop proof
- Test iPhone, Android, and dim lighting
- Compare against a known-good black-and-white version
QRCode Lab supports brand colors with scan-safe defaults. More print tips: quality export · printing guide. Try branded codes.