QR codes for print: the module math behind "make it bigger"

<p>"The QR code doesn't scan" is almost never a bug in the generator. It's usually a print size problem, and print size is simple math once you know what a QR code is made of. Here's the math, with numbers from the <code>qrcode</code> npm package.</p> <h2> A QR code is a grid of modules </h2> <p>Every QR code is a square grid of small squares called modules. The grid size depends only on the <stro

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