The history of QR codes
How a parts-tracking tool from a Japanese automotive supplier became a worldwide standard — and why it took phone cameras, not marketers, to make it part of everyday life.
Short answerThe QR code was invented in 1994 at Denso Wave, a Japanese company in the Toyota group, by a team led by Masahiro Hara, to track car parts faster than barcodes allowed. Denso Wave chose not to enforce its patent, the format became the international standard ISO/IEC 18004, and it went mainstream once phone cameras could read it natively.
A factory problem
In the early 1990s, Japanese car plants tracked parts and assemblies with ordinary linear barcodes. As production systems grew more detailed, a single label needed more information than one barcode could carry, and workers ended up scanning several codes per item. Each scan required lining the scanner up with the bars.
Denso Wave, the part of the Denso group that made scanners and automatic identification equipment, set a small team under engineer Masahiro Hara to design something better. The brief: hold far more data than a barcode, including Japanese kanji and kana characters, and be read fast. The result, released in 1994, was named QR — Quick Response — after that second goal.
Design decisions that stuck
The most recognisable feature, the three large squares in the corners, came from the speed requirement. A scanner needs to find a code in a cluttered image before it can read anything. Hara’s team wanted a shape that almost never appears by chance on printed labels and packaging, and settled on nested squares whose black-white-black proportions — 1:1:3:1:1 along any line through the centre — are distinctive from every direction. With three of them, the scanner knows the position, size, and rotation in one go.
- Error correction was built in from the start, because factory labels get oily, scratched, and torn. The four levels in use today are explained in QR code error correction.
- Alignment patterns were added to the later Model 2 specification, letting larger codes be read on curved surfaces and at an angle. Model 2 is the form used almost everywhere today.
- Several encoding modes — numeric, alphanumeric, byte, and kanji — let the same symbol pack digits tightly or carry full text.
How these parts work together when a camera reads a code is covered in how QR codes work.
Free to use, and a standard
Denso Wave patented the QR code but announced that it would not exercise the patent for codes that follow the standard. Anyone could make a generator or a reader without paying a licence fee. That decision is the main reason QR spread beyond Denso’s own customers, rather than remaining one proprietary format among many.
The specification was standardised through industry bodies and Japanese national standards, and published as the international standard ISO/IEC 18004 in 2000. Later revisions have refined it. The name “QR Code” remains a registered trademark of Denso Wave, which is why careful publications credit it, but the format itself carries no fee.
From Japanese phones to every camera
The first consumer wave came in Japan in the early 2000s, when mobile phones with built-in cameras began to ship with QR reading software. Magazines, posters, and adverts used codes to send readers to mobile websites, and scanning became an everyday habit there years before it did in most other countries.
Elsewhere, the 2000s and early 2010s were awkward. Scanning required a separate app that most people never installed, and many codes on adverts led to pages that were not built for phones. QR earned a reputation as a gimmick.
The turning point was native support. With iOS 11 in 2017, the iPhone’s built-in camera app began recognising QR codes automatically, and Android camera apps and Google Lens offered the same around that period. Once pointing the ordinary camera was enough, the main barrier was gone — the same steps covered in how to scan a QR code.
The pandemic and after
The COVID-19 pandemic made contactless everything a priority, and QR codes were ready. Restaurants replaced printed menus with a code on the table, venues used them for check-ins and tickets, and many people who had never scanned one learned to in a matter of weeks. Many of those habits outlasted the emergency — see QR codes for restaurant menus.
Today QR codes are used for payments, boarding passes, product information, Wi-Fi sharing, and above all for linking printed things to web pages. In retail, they are beginning to appear on packaging alongside — and in some cases in place of — the traditional barcode, as described in QR code vs barcode. Thirty-odd years on, the basic design from the parts-tracking project is unchanged.
Wider use has also brought abuse, such as fake codes stuck over real ones. The guide are QR codes safe? covers what to check before opening a link. For the format itself, start with what a QR code is.
Make a standard QR code for any web link:Generate a QR code
Related questions
A team at Denso Wave in Japan led by engineer Masahiro Hara. It was released in 1994 to track automotive parts.
Quick Response. The name reflects the original goal of a code that a scanner could find and read faster than a traditional barcode.
Yes. Denso Wave holds the patent but chose not to exercise it for standard-compliant codes, so anyone can create and read QR codes without a licence. “QR Code” is a registered trademark of Denso Wave.
In Japan, in the early 2000s, through camera phones with built-in readers. Worldwide, after phone camera apps began reading them natively — iPhones from iOS 11 in 2017 — and then sharply during the COVID-19 pandemic.
Yes. It is defined by ISO/IEC 18004, first published in 2000 and revised since. Any compliant generator produces codes that any compliant reader can scan.