Originally developed in the mid-1990s for manufacturing and inventory control, QR codes most often appear as a small graphic that looks like randomly placed small black squares arranged in a ...

ST. PETERSBURG, Fla. — If you’ve signed up for a COVID-19 vaccination, or got tested for the coronavirus at any point during the pandemic, chances are you used a QR code during the process. QR codes ...

Let me come clean: For way too long now, I’ve been excited about the 2D optical code format called QR Code. I even convinced TidBITS to put one on every article page for a while. I don’t get a ...