Reference
๐ URL / TextAny website URL or raw text string
๐ณ UPI PaymentIndia UPI deep-link โ works with PhonePe, GPay, Paytm
๐ถ WiFiAuto-connects device to the Wi-Fi network on scan
๐ต BluetoothBluetooth device pairing โ name + MAC address
๐ค ContactvCard 3.0 โ saves directly to contacts on scan
๐ง EmailPre-fills email client with to, subject and body
๐ PhoneOpens dialler with the number on scan
Error Correction: L ~7% ยท M ~15% ยท Q ~25% ยท H ~30%. Higher levels tolerate more damage but produce denser codes.
Dash Array: SVG stroke-dasharray โ "0" = solid, "4 8" = dashed, "10 5 5" = dash-dot.