A Short History of QR Codes (and Why They Exploded in 2020)

Most technologies that quietly take over the world were invented for some other reason and got stuck on, accidentally, decades later. QR codes are no exception. They were designed to track car parts on a Toyota factory floor, lived in industrial obscurity for two decades, and then — inside of about six months in 2020 — ended up on every restaurant table in the developed world.

1994: born in a Toyota subsidiary

QR codes were invented by Masahiro Hara and his team at Denso Wave, a subsidiary of Toyota that built scanning systems for vehicle assembly. Their problem was prosaic: a single car has thousands of parts, each with its own ID, and the linear barcodes Toyota was using couldn't hold enough data per scan. A worker would scan the same crate eight or ten times to register every part.

Hara's insight was to give the barcode a second dimension. A 1D barcode (like the UPC on grocery items) holds ~20 digits; a 2D barcode could hold thousands of characters and several types of data. He drew design inspiration from the black-and-white squares of the boardgame Go.

The result, patented in 1994, was named "QR" for Quick Response — a reference to how fast scanners could read it. Crucially, Denso Wave released the patent royalty-free, which is the single biggest reason QR codes ever escaped the factory floor.

1995–2010: industrial life

For 15 years, QR codes lived where every barcode lives: on crates, on parts, on shipping labels, on inventory in warehouses. Japan adopted them widely in the 2000s for everything from train tickets to outdoor advertising, partly because every Japanese feature phone shipped with a built-in QR scanner. Outside Japan, scanning required a clunky third-party app and QR usage stayed niche.

Marketers in the West repeatedly tried to make QR codes happen. Print ads in the late 2000s plastered codes everywhere, and users mostly ignored them — partly because reading a code was a five-tap process involving an unfamiliar app.

2017: the iPhone Camera adds a QR scanner

The pivotal change was Apple putting QR scanning directly into the iOS Camera app in iOS 11 (September 2017). Suddenly, every iPhone user had a QR scanner built into the app they already used to take photos. Android followed within a year.

With the friction gone — point camera, tap notification — QR codes were one tap from a working URL. The technology had been ready for a decade. The user habit took hold within months of the OS-level support.

2020: COVID and contactless menus

Then came the pandemic. Restaurants couldn't hand out physical menus. Suddenly, an absolutely mass-market use case — showing diners a menu without touching paper — needed a zero-friction, zero-cost, zero-download solution. QR codes were the only thing that fit.

Within a single calendar quarter, almost every restaurant in North America and Europe slapped a QR code on their tables. Once the habit took hold for menus, it spread laterally:

• Concert and event ticketing
• Loyalty programs and check-ins
• Store displays and product packaging
• Public transport ticketing
• Vaccine passports and health passes
• Vehicle registration and parking
• Medication safety inserts

The 2020–2022 inflection wasn't a technology change at all. It was the world finally hitting the point where everyone knew what to do with a QR code.

2022 onwards: payments and identity

The biggest QR shift since 2020 has been on payments. China's Alipay and WeChat Pay have used QR codes for in-store payments for nearly a decade; that pattern spread to India (UPI), Brazil (Pix), and most of Southeast Asia, where QR-based payments now dominate.

In Europe and North America, Apple Pay and Google Pay still dominate at retail, but QR-based payments are showing up in peer-to-peer apps and small-merchant scenarios where NFC terminals are too expensive.

Identity is the other frontier: digital IDs (driver's licenses, university credentials) are increasingly delivered via signed QR codes that a verifier can validate against a public key. The data on the QR is the credential itself; no internet connection required at scan time.

What hasn't changed

The QR code spec is essentially unchanged since 2000 — the same Reed–Solomon error correction, the same finder patterns, the same module grid. Newer variants (Micro QR, rMQR, frame QR) exist but are barely used in consumer contexts. The format has survived because it's simple, decodable on cheap hardware, and royalty-free.

The takeaway

QR codes are an example of a technology that needed three things to go mainstream: built-in OS support, a high-frequency use case, and a globally shared moment of behavior change. The first arrived in 2017; the second was always there; the third arrived in March 2020. By the time you next pay for a coffee, ten people in line will have scanned a QR code without thinking twice — which is how you know a technology has actually arrived.

And if you're here to make one of your own, QR This! stands on the shoulders of three decades of work and a freely-released patent. Free as in beer and free as in speech.