Web Reference: Aug 8, 2025 · QR codes are pixelated black and white squares that perform magic when we point the cameras on our phones at them—but what’s going on that makes this little spell possible? Whereas a barcode is a machine-readable optical image that contains information specific to the labeled item, the QR code contains the data for a locator, an identifier, and web tracking. To store data efficiently, QR codes use four standardized modes of encoding: numeric, alphanumeric, byte or binary, and kanji. [5] . Here's how QR codes work, technically and basically. We also cover the parts of a QR code and how dynamic QR codes work.
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