Under the trial, customers will be able to use their Service NSW app to scan a NSW government issued QR code to check in at hospitality venues in Dubbo and those owned by hospitality giant Merivale.

Workplaces, universities, schools, TAFE, supermarkets, and more will be required to use a Service NSW QR code from July 12.

QR codes can house a whole lot of data, from the URL of a webpage or service, to where to directly download an app. Here's how to scan them.