The anatomy of a scannable QR
A reliable QR has high contrast, a sufficient quiet zone (margin), and is printed at a size appropriate to the scanning distance. Start with a clean, high-resolution code, and avoid distortions introduced by scaling.
Contrast, size, and quiet zone
- Contrast: Dark code on a light background. Avoid patterned or glossy backgrounds.
- Size: A common rule of thumb is 10 mm per meter of scanning distance.
- Quiet zone: Leave at least 4 modules of clear margin around the code.
Error correction and logos
Higher error correction (e.g., Q or H) improves resilience to damage or small logos but increases module count. If you add a logo, keep it small and test at intended distance and lighting.
Clean vs. trackable URLs
Clean URLs scan faster and look trustworthy. For campaign tracking, add parameters judiciously and consider a short redirect domain. Always test the final printed code—not just the screen preview.
Placement and testing
- Use matte surfaces; avoid reflections and deep folds.
- Place at eye level for posters; ensure adequate lighting.
- Test with multiple devices and distances before large print runs.