QR version
A QR code's version is its size in modules, numbered 1 to 40. Version 1 is 21×21 modules, and each step up adds 4 modules per side.
The version determines how many modules a QR code has, and therefore how much data it can hold. Version 1 is a 21×21 grid; version 40 is 177×177. More data, whether a longer URL or a higher error-correction level, pushes the code to a higher version, which means more, smaller modules in the same printed area.
This is one reason short links matter for print: a short redirect URL keeps the version low, the modules large, and the code easy to scan from a distance. See the QR version capacity table for the data limits at each version.
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