# QR codes on billboards and out-of-home

> A billboard QR code must be at least a tenth of the viewing distance — a metre wide at 10 m, five metres at 50 m. For most roadside billboards that is impractical, and the honest answer is usually that a QR code is the wrong tool.

Source: https://useqr.app/qr-codes-on/billboards · Last reviewed 2026-08-21 · UseQR is free forever, MIT licensed, no signup.

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| Typical scan distance | **10–50 m** |
|---|---|
| Minimum code width | **1–5 m** |
| Error correction | **L** |

## Do the arithmetic before committing

| Viewing distance | Minimum code width |
|---|---|
| 10 m | 1 m |
| 20 m | 2 m |
| 30 m | 3 m |
| 50 m | 5 m |

A 48-sheet billboard is about 6 × 3 m. A compliant code for a 30 m viewing distance occupies
half its height.

## Motion makes it worse

A driver at 50 km/h covers 14 m per second. There is no realistic scenario in which a
passenger unlocks a phone, opens the camera, frames a code and holds it steady. Roadside
billboard QR codes do not work, and pretending otherwise wastes the media spend.

## Where out-of-home codes do work

Anywhere the audience is **stationary**: bus shelters, platform posters, lift lobbies,
escalator panels, stadium concourses, queue barriers. There, viewing distance drops to 1–3 m
and the code becomes both feasible and effective.

## If you must

- Error correction **L**. At this size every module is huge; redundancy is wasted area.
- Keep the payload minimal — a short domain, no UTM string in the code itself.
- Print a memorable short URL alongside, because most people will type it instead.

## Try it

- https://useqr.app/url
- https://useqr.app/size-calculator
- https://useqr.app/validate