How big should your QR code be
There is no single correct size, only the right size for the distance people scan from. A simple ratio gets it right every time.
A QR code that is too small will not scan, and one that is too large wastes space, so size is really about scanning distance. A handy rule of thumb links the two: the further away people scan, the bigger the code needs to be. This guide gives that ratio, sensible minimums and examples for everything from a business card to a billboard.
Rule of thumb: code width of at least one tenth of the scanning distance. A card needs 1.5-2 cm; a poster read from 2 m needs 20 cm or more.
Why it works
Distance drives size
The size you need depends almost entirely on how far away people will hold their phone to scan.
A simple 10-to-1 rule
As a guide, the code should be about a tenth of the scanning distance, so 1 metre away needs roughly 10 cm.
Mind the minimum
Even up close, keeping a printed code at least 2 cm wide avoids unreliable scans.
Bigger is safer than smaller
When unsure, size up; a slightly large code still scans, while a slightly small one may fail.
How to create yours
- 1
Estimate the scan distance
Decide how far away people will typically be when they point their camera at the code.
- 2
Apply the ratio
Divide that distance by ten to get a safe minimum width for the code itself.
- 3
Add the quiet zone
Leave clear margin around the code so the final printed area is a little larger than the code.
- 4
Print a proof and test
Produce one at the planned size and scan it from the real distance before the full run.
Ideas & examples
Business card
Scanned from close up, a code around 2 cm is plenty and leaves room for your details.
Poster on a wall
Read from a metre or two, aim for 10 cm or more so people can scan where they stand.
Billboard or banner
Scanned from far away, the code must be very large, often tens of centimetres across.
Common questions
Is there an absolute minimum size for any code?
Around 1 cm works only at arm's length. Below that, autofocus on many phones starts hunting and failing.
How do I size a code for a wall or banner?
Use the one-tenth rule: width equal to roughly a tenth of the distance the furthest reader will stand.
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