QR codes are one of the easiest ways to move offline attention into an online action. They work well for restaurants, shops, clinics, events, schools, real estate, packaging, and service businesses.
Before printing
Use a clear destination, test the QR code on multiple phones, add a short call to action, and use a trackable short link behind the code so scan activity can be measured.
After launch
Review scans and clicks by time, location, device, and referrer. If one placement performs better, reuse that format in future campaigns.