When should I use a QR code?

QR codes provide a useful way of connecting offline marketing campaigns with an online journey, giving your audience instant access to more info about your products and services.

They can be used in any setting where users have the ability (and incentive) to scan the QR image to access a webpage, on posters, on exhibition stands, on printed collateral, even in TV broadcasts.

This means it needs to be large, clear, accessible and in a place with internet access (preferably cellular / mobile phone signal) but at least WiFi. They are less useful on underground metros where internet is hard to access.