The QR Code Was Invented to Track Car Parts
A Toyota subsidiary engineer designed it in 1994 to scan auto parts faster. He took inspiration from his lunch break Go board.
Masahiro Hara worked at Denso Wave, a Toyota Group spinoff in Aichi, Japan. In 1994 his team was trying to fix a bottleneck on the factory floor: barcodes could only hold about 20 alphanumeric characters, and tracking a car through assembly required scanning ten separate codes per part. The scanners were running ragged.
Hara wanted a code that held more data and could be read in any orientation, fast. He spent his lunch breaks playing Go, and the grid of black and white stones on the board pushed him toward a two-dimensional design. Storing data in both axes meant a single code could hold thousands of characters instead of dozens.
The trick that makes a QR code readable from any angle is the three nested squares in the corners. A scanner finds those distinctive shapes first, uses them to figure out the orientation, then decodes the grid between them. Reed-Solomon error correction allows up to 30% of the code to be damaged or obscured and still recoverable — which is why a QR code with a logo punched through the middle still works.
Denso Wave held the patent but chose not to enforce it, releasing the spec for free use. That decision is why the format went global. By the late 2000s it was standard on Japanese magazine ads and train tickets. The Western breakthrough came during COVID, when restaurants needed contactless menus overnight.
A grid that was supposed to track engine blocks now points your camera at a payment screen in Shanghai, a vaccination record in Berlin, or a wedding RSVP in Ohio.
Make Recess yours.
Sign in to save the ones you loved, never see the same thing twice, and tell us what you want more of.