Interesting QR code facts

QR codes are everywhere — menus, posters, business cards, packaging. Here are a few facts that make them worth a second look.

Born in a factory

The QR code was invented in 1994 by Denso Wave, a Japanese company, for tracking parts in car manufacturing. They needed something that could be scanned quickly and hold more data than a barcode — hence "Quick Response." It was released to the public domain, which is why no one owns the patent and they spread so fast.

One square, thousands of characters

A single QR code can store up to 4,296 alphanumeric characters — or 7,089 digits. That's enough for a long URL, a WiFi password and network name, a vCard, or even a short paragraph. That capacity is why one small square can do so much.

Built-in error correction

QR codes include redundant data (typically 7–30% of the pattern). That's why you can put a logo in the middle and it still scans — the rest of the pattern compensates. Higher error correction (e.g. "H" level) lets you cover more of the code with a logo and still keep it readable.

From niche to everyday

For years QR codes were big in Asia and less common elsewhere. The pandemic changed that: contactless menus, check-in links, and vaccine certificates made scanning a square second nature. Today most people know to point their camera at a QR code when they see one.

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