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The QR code quiet zone: why the empty margin matters
The quiet zone is the clear space around a QR symbol. It separates the finder pattern from nearby text, lines, borders and images.
How much margin?
The QR specification calls for a quiet zone at least four modules wide on each side. A module is one small square in the code, so the physical margin grows with the module size.
The margin should use a uniform background that contrasts with the code. Keep page decorations and captions outside it.
Common ways it gets lost
A design crop can cut off the outside modules. A colored frame can touch the symbol, or a layout can treat the visible pattern as the full footprint and leave no room for its border.
Some readers can decode a code with a smaller margin in ideal conditions. That does not make the design robust across cameras and print settings.
Add it back
Use a QR export that includes margin or place a clear, unprinted border around the symbol. Measure the margin in module widths rather than guessing in pixels.
In short: Reserve four clear modules on every side when placing a code in print.