Who Invented QR Codes?
Who invented QR codes? Masahiro Hara at Denso Wave in Japan, which released them in 1994 to scan car parts faster than barcodes allowed.
Nookesh Karri · 7 min read 
Masahiro Hara, an engineer at Denso Wave in Japan, invented QR codes with a small team. Denso Wave, then a division of the car parts maker Denso Corporation, released the code in 1994 so factories could scan parts faster and store more data than a barcode holds. Hara got the idea for the grid from the board game Go.
Who invented QR codes: the person, the team and the company
The QR code was invented by Masahiro Hara, working with one colleague, inside Denso Wave. Denso Wave’s history page says Hara “dared to try this with only one other person as his team member,” and its development story calls it a development team with only two members.
The credit splits three ways:
| Who | Role |
|---|---|
| Masahiro Hara | Lead inventor. Born in Tokyo in 1957, a 1980 graduate of Hosei University, later chief engineer at Denso Wave |
| His colleague | The second member of the two-person development team |
| Denso Wave | The company that owns the patent and the “QR Code” trademark, then a division of Denso Corporation |
Wider recognition went to a larger group. In 2014, Wikipedia notes, Hara and the inventors of the QR code development team received the European Inventor Award. Denso Wave says it was the Popular Prize, chosen by public vote.
Why Denso needed something better than a barcode
Denso needed a faster, denser code because barcodes were slowing down its factory floors. In 1992, Hara was developing barcode scanners and OCR devices at Denso when manufacturing sites asked for faster scanning. Workers scanned up to approximately 1,000 barcodes a day.
The barcode had two hard limits:
- It can hold only 20 alphanumeric characters or so, according to Denso Wave.
- It can’t store kanji or kana, which Japanese users kept asking for.
Products were also getting smaller, so the code had to fit in less space. The car industry became the first big user: Denso Wave says the QR code was adopted for the auto industry’s electronic Kanban, the cards that track parts through a factory.
How a game of Go shaped the design
The game of Go gave Hara the idea of storing data in a grid of black and white squares. A barcode carries information in one direction only. A Go board holds black and white stones across both directions, and that’s the leap from a 1D barcode to a 2D code.
The Go story is well documented, but the timing isn’t. Wikipedia says the idea came during a lunchtime game of Go. Singapore’s GovTech ties those lunchtime games to solving smudges, not the first idea. Hosei University says the clue came from “his childhood love of Go.” The Japan Automotive Hall of Fame keeps it simple: the code “was inspired by the Go Board pattern.”
The finder squares were the real invention
The three big squares in the corners of every QR code are Hara’s key contribution. The Japan Automotive Hall of Fame credits the three finder patterns on the corners to him directly.
They tell a scanner where the code is and which way up it sits. Denso Wave surveyed fliers, magazines and cardboard boxes to find the ratio of black and white least used on printed matter. The answer was 1:1:3:1:1. Because that pattern rarely shows up by accident, a scanner can lock onto it at any angle out of 360 degrees.
After a year and a half of work, the team had a code that stored about 7,000 numerals plus kanji. Denso Wave says it read more than 10 times faster than other codes. For what happens during a scan today, see how QR codes work.
Hosei University quotes Hara on the first real problem: the code “could not be read accurately due to ink blotches.” Error correction fixed that. Denso Wave says a QR code can be read accurately even if part of it is stained or missing. It’s the same feature that lets you put a logo in the middle of a QR code today.
Why QR codes are free to use
QR codes are free because Denso Wave chose not to enforce its patent. The history page says Denso Wave kept the patent rights but declared it would not exercise them, a policy “in place from the very beginning.”
Hara credits that decision directly. He told Hosei University that QR spread because “it is license-free.” Denso Wave’s FAQ confirms you don’t need an application, a fee or a licensing contract to use a QR code.
The one thing Denso Wave does protect is the name. “QR Code” is its registered trademark in Japan and other countries, and that covers the word only, not the pattern.
My take: giving the patent away is the reason you can scan a menu today. A licensed code would have stayed inside factories, the way many proprietary barcodes did.
How the QR code became a global standard
The QR code went from a Denso product to an international standard in six years. Denso Wave’s history lists the steps:
| Year | Milestone |
|---|---|
| 1994 | Denso Wave announces the QR code |
| 1997 | Approved as an AIM standard |
| 1999 | Approved as a Japan Industrial Standards 2D code |
| 2000 | Approved by ISO as an international standard |
| 2004 | JIS X 0510 approved; Micro QR made a JIS standard |
| 2008 | iQR Code released, with rectangular modules |
| 2012 | Good Design Award |
| 2014 | Frame QR introduced; European Inventor Award |
The format itself grew too. Denso Wave’s FAQ says Version 1 is 21 x 21 modules and Version 40 is the largest, holding about 3 KB of binary data at the lowest error correction level.
What the history doesn’t settle
The limitation of any short history like this: the second member of the original two-person team isn’t named on Denso Wave’s own pages. The award list Wikipedia cites names several engineers, and I couldn’t confirm it against the European Patent Office page.
The patent choice also has a modern side effect. Because anyone can make a QR code, nothing stops a scammer from printing one either. That’s why our guide on how to check if a QR code is safe exists.
FAQ
What does QR stand for in QR code?
QR stands for quick response. Denso Wave picked the name because the code was built to be read much faster than the barcodes it replaced on factory lines.
Did the inventor of the QR code get rich from it?
Not from licence fees. Denso Wave kept the patent rights but declared from the start that it would not exercise them, so anyone can make and use QR codes without paying.
Is QR Code a trademark?
Yes, but only the words. Denso Wave says “QR Code” is its registered trademark in Japan and other countries, and that the trademark covers the word, not the pattern itself.
Was the QR code inspired by the game Go?
Yes, according to Hara’s own accounts. Sources disagree on the details: some say the idea came during lunchtime games at work, while Hosei University says it came from his childhood love of Go.