Quiet zone

Definition

The quiet zone is a region of the same colour as the light modules of the symbol — typically white — extending at least four modules from every edge of the symbol. It is part of the symbol's definition; a symbol printed without an adequate quiet zone is non-conformant.

Role in detection

The quiet zone provides the contrast boundary against which a scanner locates the symbol's position-detection patterns. Without it, the 1:1:3:1:1 ratio of the finder pattern cannot be reliably distinguished from surrounding artwork.

Practical guidance

• Print or render the quiet zone in the same colour as the symbol's light modules.
• Maintain the four-module minimum on every side, including when the symbol is centered within a coloured background or surrounded by decorative artwork.
• When in doubt, increase the quiet zone beyond four modules; the standard permits any larger margin.