Contrast that is checked
A code lighter than its background is refused. Dark-on-light is what phone cameras are built to read.
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Colour, module shape, caption, and margin are all adjustable. Each one has a limit past which scanners start failing, so the editor enforces those limits instead of letting you discover them after printing.
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No email, card, or scanner app requiredA code lighter than its background is refused. Dark-on-light is what phone cameras are built to read.
Circular modules cover less area than the squares they replace, so those codes are decode-tested too.
Set the quiet zone from a tight wrap to a generous border, depending on what it is being placed on.
QR Inspector sends scanners directly to your destination with no advertising interstitial. Created codes keep redirecting if you stop paying, and scans are not metered.
See simple pricingLight modules on a dark background are unreliable on iOS in particular. The guard is deliberate.
The standard asks for four modules. We tested one to four against plain, dark, and coloured backgrounds and all of them read; zero fails on anything but its own background colour.
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