Module
A module is a single square in a QR code, the smallest unit of the black-and-white grid that a scanner reads as one bit.
Every QR code is a grid of modules. Their arrangement encodes the data, the finder patterns, and the error correction. When people talk about a code being "denser," they mean it has more modules packed into the same space, which happens with a longer payload or a higher error-correction level.
Module size is what really governs scannability: a scanner needs each module to be at least a couple of camera pixels across. That's why print size and scanning distance matter. Keep the modules big enough and the code reads on the first try. Our size calculator does that math for you.
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