QR code design and customisation

Colours, shapes, logos and frames — and the contrast and coverage limits past which a code stops scanning.

• Adding a logo to a QR code, safelyKeep the logo central, under about 20–25% of the code area, at error-correction level Q or H, on a solid light panel with two or three modules of…
• Choosing QR code colours that scanDecoders threshold on luminance, not hue, so the rule is a luminance difference of at least 40% between modules and background, dark on light. Apply the…