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Developer Builds QuadQR, a 4-Color QR Code Format That Doubles Data Density

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A developer named Akansh Sirohi has created QuadQR, an experimental open-source 2D matrix code format that encodes data using four colors — red, green, blue, and white — instead of the traditional black-and-white binary system. By assigning 2 bits to each color cell, QuadQR doubles the data capacity per module compared to standard QR codes. The project addresses a gap the creator noticed while working with QR codes: modern cameras can distinguish millions of colors, yet QR technology still relies on just two visual states dating back to its original design. QuadQR includes features such as Reed-Solomon error correction, optional AES-256-GCM encryption, perspective correction, and both Node.js and browser APIs. The format is already publicly available via npm and can be tested through a live browser demo linked from its GitHub repository.

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