Size, contrast, error correction and placement: the practical rules for a QR code that scans first time.
Use a code that points to a link you control
Print a QR code that encodes a short link to your card, not your phone number or address. Then you can change your details later without reprinting. Avoid temporary or trial links that may expire.
Size and quiet zone
As a rule of thumb, print the code at least 2 cm by 2 cm, and larger if people will scan from a distance. Leave a blank border around it, called the quiet zone, of at least four modules. Never let design elements touch the code.
Contrast and colour
Dark code on a light background is the most reliable. Many scanners handle inverted codes, but not all. A deep navy on white works well. Avoid low-contrast pairs such as grey on beige.
Error correction
QR codes include error correction at four levels from L to H. Higher levels survive more damage but make a denser code. For printed business cards, medium is a sensible default. Do not place a logo in the middle unless you use a high level and test it.
Test before you print
Scan the printed proof with an iPhone and an Android phone, in poor light, from arm's length. If either struggles, increase the size or contrast. A failed scan at a networking event costs more than another proof.
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