QR codes are widely used in websites, mobile apps, marketing materials, and retail for enhancing user experience and streamlining interactions. They connect the offline and online worlds, making it crucial to test their functionality and security. Testing QR codes involves verifying their readability, error handling, performance metrics, backend association, and security aspects. It is essential to use diverse scanning devices and consider various environmental factors while testing QR codes. Using platforms like LambdaTest can help in efficient remote testing of QR codes across multiple real devices with automation support.