Design · 4 min read

QR codes on business cards that actually scan

A QR code turns a piece of card into a link, which is the only way a printed card competes with a phone. It is also very easy to print one that will not scan, and you will not find out until the cards are in a box on your desk.

Size

Print it at 0.75″ square or larger. Below that, the individual modules get close to the resolution of the print and the ink spread between them starts to matter. A card is small and the temptation is to tuck the code into a corner at half an inch; resist it.

Quiet zone

A QR code needs a margin of blank around it — four modules on every side — before a scanner can find its edges. Artwork crowding the code, or a background photo running underneath it, is the single most common reason a printed code fails.

Contrast and inversion

Dark code on a light field. That is what scanners expect. White-on-black inverted codes work on some phones and fail on others, which is worse than failing everywhere because you will test it on yours and ship it.

Avoid putting a code on a gloss finish if you can help it. Under a ceiling light, the reflection off UV gloss can wash out enough of the pattern to break the read.

Point it somewhere worth going

• A booking page beats a home page. Fewer taps to the thing you actually want.
• A short, stable URL. If the destination moves, every printed card is dead, so use a link you control and can redirect.
• Not a PDF. Phone browsers handle them poorly and it feels like a dead end.

Where to put it

The back, usually, in a corner with real space around it. On the front it competes with your name, and the front is already carrying the introduction.

Common questions

How big should a QR code be on a business card?

At least 0.75 inches square, with four modules of blank quiet zone on every side. Smaller codes often fail to scan once ink spread is taken into account.

Why will my printed QR code not scan?

Usually the quiet zone is too small, the code is printed under three quarters of an inch, contrast is inverted, or gloss coating is reflecting light across the pattern.