Can you change a QR code's colour without making it unreadable?
Yes, as long as you maintain strong contrast between the QR modules and the background. Dark colours on a light background are generally the most reliable.
Explanation
QR scanners need to distinguish the modules from the background quickly. The exact colour matters less than contrast and consistency.
You can adapt a QR code to your brand, but avoid busy backgrounds, transparency, weak gradients and colours with very similar brightness.
The three position markers should remain especially clear, and a clean light area around the QR helps detection.
If the QR is printed on glass, glossy packaging or a screen, test it under realistic lighting conditions.
Concrete example
Dark blue on white can work very well. Pale yellow on white has much less contrast and is far more likely to scan poorly.
Common mistake
Do not approve the design using only one high-end phone. Test several devices and less favourable lighting conditions.
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