QR code size refers to the physical dimensions of the printed or displayed code. The minimum size depends on scanning distance, data density, and error correction level.
The general rule is that the QR code should be at least 1/10 of the scanning distance. For a phone held 30cm away, the QR code needs to be at least 3cm. More data or higher error correction increases the number of modules, requiring a larger print size.
Minimum 2cm × 2cm for close-range scanning.
At least 3-5cm for arm's length scanning.
15cm+ for scanning from several meters away.
2cm × 2cm for close-range scanning (under 30cm). Scale up proportionally for greater distances.
Yes. More data means more modules, requiring a larger physical size to keep each module scannable.
Technically no, but very large codes on small screens may require the user to step back to scan.
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