How QR Codes Work: Encoding Modes and Reed-Solomon
QR codes store data in a 2D matrix using 4 encoding modes and Reed-Solomon error correction. This guide explains the structure and how scanners read them.
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Tags: qr-code, encoding, developer-tools
How QR Codes Work: Data Matrix, Encoding Modes, and Reed-Solomon A QR code is not magic — it's a precisely specified 2D matrix barcode defined in ISO/IEC 18004. Understanding its internals helps you make better decisions when generating codes: which encoding mode to use, why URLs with numbers produce smaller codes, how error correction works, and why adding a logo doesn't necessarily break scanning. This is a technical explainer. If you just want to generate a QR code, the free QR Code Generator handles all the decisions for you. But if you want to know what's actually happening inside that grid of squares, read on. --- The Physical Structure of a QR Code Before the encoding, there's the physical layout. A QR code is made of modules — individual squares that are either dark or light. The…
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