QR Code Structure Simulator (2D)

This 2D simulator builds a QR-code-like module grid live from any text you type, using a simplified encoding scheme that mirrors the real structure: three finder patterns anchor the corners for instant orientation, timing patterns line up every row and column, and the remaining modules are split between your actual message bits and a reserved error-correction block. Switch the error-correction level from L to H to see the trade-off real QR codes make — more redundancy means more resilience to damage, but less room for raw data — and watch the capacity readout update as your message grows or shrinks.