A short history of the QR code

QR codes feel like a product of the smartphone era, but they predate the iPhone by over a decade. Their journey from a Japanese car factory to restaurant tables worldwide is a good lesson in how an open standard wins.

The problem on the factory floor

By the early 1990s, Toyota’s production system was straining the humble barcode. A traditional barcode holds about 20 characters and must be scanned in one orientation, so workers tracking components were scanning multiple barcodes per item, slowly and one alignment at a time. Denso Wave, which supplied automotive equipment, set out to design something that held far more data and could be read fast from any angle.

1994: Masahiro Hara’s breakthrough

The engineer Masahiro Hara led the project. The result, released in 1994, was the Quick Response code — designed, as the name says, to be read quickly. Two ideas made it work:

• Two dimensions. By storing data in a grid rather than a single row of bars, the code held thousands of characters instead of dozens.
• The three corner squares. Those distinctive finder patterns let a scanner locate and orient the code instantly, from any angle — the feature that made QR codes genuinely “quick”. Hara has said the team studied the ratio of light-to-dark areas across many images to choose a pattern unlikely to appear by accident on packaging.

Built in was the error correction that lets a code survive dirt and damage on a factory floor — and still rescues coffee-stained restaurant menus today.

The decision that mattered: keeping it open

Denso Wave held the patent but announced it would not exercise its rights, publishing the QR code as an open standard free for anyone to use. It later became an international standard, ISO/IEC 18004. That choice is why no licence fee stands between you and a QR code, and why every camera maker could build in support. A proprietary, royalty-bearing format would almost certainly have stayed niche.

Two decades of slow growth, then a sudden boom

Through the 2000s, QR codes spread across Japanese manufacturing, logistics and advertising, and appeared on packaging worldwide. Elsewhere they had a stuttering start: marketers plastered them everywhere, but early phones needed a separate app to read them, and that friction killed adoption. Many wrote QR codes off as a fad.

Two shifts changed everything. First, around 2017, iOS and Android built QR scanning directly into the native camera — point and scan, no app. Second, the COVID-19 pandemic made contactless everything essential overnight, and the QR menu, check-in and payment became ordinary. The technology was 25 years old; the moment had finally caught up with it.

QR codes today

QR codes are now scanned billions of times a year across payments, ticketing, packaging, marketing and Wi-Fi sharing. In several countries they underpin everyday mobile payments. The format has barely changed since 1994 because it didn’t need to — the design was sound; the world simply took time to build the cameras and habits around it.

It’s also a quiet rebuttal to the worry that QR codes might “expire” as a technology. A 30-year-old open standard, embedded in every smartphone and in payment systems used by hundreds of millions, isn’t going anywhere — much as barcodes from the 1970s are still scanned today. (More on that in do QR codes expire?)