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The Quiet Zone Mystery: Why Your Custom QR Code Stops Scanning
The white margin around a QR code is not decoration — it is part of the spec. Learn the 4-module rule, common Canva mistakes, and exact pixel math.
Color Contrast for QR Codes: The 4:1 Rule and the Logo-Embedding 30% Rule
Why your branded QR fails to scan, the WCAG-adjacent 4:1 luminance ratio, and how much logo you can safely embed before error correction breaks down.