What Is a QR Code?

The QR code was invented in 1994 by Masahiro Hara, an engineer at Denso Wave, a subsidiary of the Japanese automotive giant Toyota. The original purpose was deceptively simple: track vehicle parts as they moved through the manufacturing process. Traditional barcodes could only hold about 20 characters, which was not enough information for Toyota's complex supply chain. Hara and his team needed something that could store significantly more data and be scanned quickly from any angle.

The result was the Quick Response code -- "QR" stands for exactly that. Unlike the one-dimensional barcodes that came before it, the QR code is a two-dimensional matrix barcode that can store thousands of characters. Denso Wave made a critical decision early on: they chose not to enforce their patent rights, allowing anyone to use the technology freely. This open approach is one of the key reasons QR codes became a global standard.

For over a decade after their invention, QR codes remained relatively niche outside Japan and industrial logistics. That changed dramatically when Apple added native QR code scanning to the iPhone camera in iOS 11 (2017), and Android followed suit shortly after. Suddenly, billions of people could scan QR codes without downloading a separate app. The COVID-19 pandemic in 2020 further accelerated adoption, as businesses worldwide adopted contactless menus, check-ins, and payments.

There are two fundamentally different types of QR codes: static and dynamic. Understanding the difference is crucial for choosing the right type for your needs.

Static QR codes encode data directly into the pattern itself. The information -- whether a URL, text, WiFi credentials, or contact details -- is baked into the black and white modules. Once created, the data cannot be changed. Static codes work offline, never expire, and require no internet connection to function. They are ideal for permanent information like WiFi passwords, contact cards, or links that will never change.

Dynamic QR codes work differently. Instead of encoding the final destination directly, they encode a short redirect URL. When someone scans the code, they are briefly redirected through a tracking server before arriving at the final destination. This indirection enables two powerful capabilities: you can change where the code points without reprinting it, and you can track how many times the code has been scanned, when, and from where. Dynamic codes are essential for marketing campaigns, menus that change, and any scenario where you need analytics or the ability to update content.