QR Code Print Size Guide: Business Cards to Billboards
The Core Sizing Rule
QR code size requirements scale directly with how far away someone will stand to scan it. The widely used rule of thumb is that the code's width should be at least one-tenth of the maximum scanning distance. This accounts for how phone cameras autofocus and how much detail they can resolve at a given distance — too small, and individual modules blur together before the camera can distinguish them.
Size Reference by Material
| Material / Placement | Typical Distance | Minimum Size |
|---|---|---|
| Business card | 20-30 cm | ~2x2 cm |
| Table tent / flyer | 30-50 cm | ~3-4 cm |
| Poster (indoor) | 1-2 m | ~10-20 cm |
| Storefront window | 1-3 m | ~10-30 cm |
| Billboard / vehicle wrap | 3-10 m | ~30 cm-1 m |
These figures are starting points, not guarantees — always test the actual printed size at the actual intended distance before finalizing a large print run.
Digital Sizing Is Different
On screens, sizing works differently since the "scanning distance" is really the distance between the screen and the scanning phone. A code displayed on a presentation slide or website should generally be at least 150x150 pixels, and larger if the audience might be viewing from a distance, like in a lecture hall.
Why Undersized Codes Are the Most Common Mistake
The single most frequent real-world QR code failure isn't damage or bad printing — it's simply making the code too small for its context, especially on posters or signage designed to be viewed from across a room. A code that scans perfectly when held close often fails completely once mounted at eye level ten feet away.
Testing Your Specific Size
Print a sample at the exact size you're planning to use, place it at the real distance your audience will encounter, and scan it with more than one phone if possible. This is the only reliable way to confirm your sizing choice actually works in practice, since screen resolution, camera quality, and lighting conditions vary.
Frequently Asked Questions
For very close scanning (under 10 cm), codes as small as 1.5-2 cm can work, but reliability drops quickly below that.
Use the one-tenth rule: divide your expected scanning distance by 10 to get the minimum code width.
Larger generally helps up to a point, but excessive size doesn't add further benefit once it's comfortably readable at the intended distance.
Not necessarily — digital sizing depends on screen resolution and viewing distance, which can differ significantly from print contexts.
Yes, always print a sample at actual size and distance before committing to a large batch.
This article is part of our QR Code Generator Guide — see the full guide for more.