1. A factory-floor problem starts it all, in 1994
Ordinary barcodes — the familiar stripes you see on packaging — store information in only one direction, so they can only hold a limited number of characters. In 1992, at a factory belonging to Denso (now Denso Wave) in Aichi Prefecture, Japan, workers had to scan barcodes roughly a thousand times a day, and the process was slowing them down rather than helping[1].
To fix this, an engineer named Hara Masahiro led a team — including Watabe Motoaki — that set out to design a new kind of symbol[2]. By storing information in two directions instead of one, this new "two-dimensional code" could hold far more data than a standard barcode. After about a year and a half of work, the team completed it in 1994: the QR code.
2. A lunchtime game of Go sparks the key idea
For a QR code to be read instantly by a camera from any angle, it needed some way to tell the scanner exactly where it was and which way it was oriented. Hara is said to have found his answer while watching a game of Go during his lunch break[3].
Watching the black and white stones on a Go board, he noticed that you don't need every square filled in to recognize a position — the pattern alone tells you where things are. That observation led to the three square markers in the corners of every QR code, called "finder patterns."
Each finder pattern is designed so that a line drawn through its center, in any direction, crosses black and white in the exact ratio 1:1:3:1:1. The development team checked huge numbers of printed materials and found this was the ratio least likely to occur naturally in ordinary printing[1] — which means a scanner can spot a finder pattern instantly, even surrounded by other, unrelated patterns.
3. Giving up the patent, and becoming a world standard
Normally, a company that invents something new uses a patent to stop other companies from using it without permission. Denso Wave did something different: it announced that it would not exercise its patent rights against anyone making a QR code that followed the official specification[4]. By letting anyone use it freely, the company let the QR code spread everywhere.
Formal standardization followed quickly: the QR code became a standard of AIM International in 1997, Japan's own JIS X 0510 standard in 1999, and the international ISO/IEC 18004 standard in 2000[4]. Giving up the patent while still becoming an official international standard meant companies everywhere had a common basis to build on.
4. Camera phones turn a factory tool into something everyone uses
At first, QR codes were mostly used in factories and warehouses for tracking parts. The real turning point came in 2002, when phones sold in Japan started including a camera feature that could read QR codes[4].
Pointing your phone's camera at a QR code and instantly landing on a website, or getting a coupon, was novel enough to catch on fast, and QR codes began to spread across Japan. Because Denso Wave had given up its patent rights, phone makers and app developers everywhere were free to build QR-reading features into their own products, which helped the format spread internationally too. Today you'll find QR codes on business cards, tickets, boarding passes, and payment systems around the world[4].
5. i-mode: the other Japanese invention that didn't spread
Five years after the QR code was born, on February 22, 1999, the Japanese phone company NTT DoCoMo launched i-mode, a service that let ordinary phones connect to the internet. It's considered the world's first mobile internet service of its kind, and at its peak it expanded to more than ten countries, including France, Germany, the United Kingdom, and the Netherlands[5].
It didn't last long outside Japan, though. One likely factor: mobile carriers overseas kept about 50% of i-mode revenue for themselves, compared with only about 10% for carriers in Japan, which made it a harder sell abroad[5]. Flat-rate data plans like Japan's "Pake-Hodai," which made using i-mode affordable and worry-free, weren't common overseas either, so customers stayed wary of running up huge bills. On top of that, mobile use abroad centered mostly on calls and text messages, with email and web browsing still mainly done on a computer — a difference in habits, not just technology.
Overseas carriers dropped i-mode one after another in the late 2000s — the Netherlands and Australia in 2007, Italy in 2009, and more — while phones in Japan kept evolving along their own path, separate from the rest of the world. That pattern became known as "Galápagos-ization," after the isolated islands where species evolve differently from anywhere else. i-mode finally shut down on March 31, 2026, when Japan's old 3G (FOMA) network was switched off[5].
If you want to look for yourself
Take a ruler to the three corner markers on any QR code and see if the black-and-white bands really do come out close to the 1:1:3:1:1 ratio described above. It's also worth asking whether you can think of other Japan-born technologies that, like i-mode, took a different path from the rest of the world — see if you can find an example besides mobile phones. Denso Wave's own website has more detail on how the QR code was developed and standardized, if you want to go straight to a primary source.