There was a period around 2012 when QR codes were a punchline. Marketers slapped them on everything — billboards, business cards, the sides of buses — without much thought about whether anyone would actually scan them. Most people didn't, because pulling out your phone, opening a separate scanner app, waiting for it to focus, and then loading a mobile-unfriendly webpage was more friction than just typing a URL. Tech commentators declared the QR code dead, and for a few years, that seemed like a reasonable call.
Then two things happened. First, Apple and Google built QR scanning directly into their default camera apps, eliminating the need for a third-party scanner. Second, a global pandemic created an urgent, practical use case: contactless menus, check-ins, and payments. Restaurants needed to stop handing laminated menus back and forth between tables. Venues needed to verify vaccination status without handling paper cards. Payment systems in much of Asia and parts of Europe had already gone QR-native. The technology that had been waiting for a reason to exist suddenly had dozens of them.
The technology itself is elegantly simple. A QR code is a two-dimensional barcode that encodes data in a grid of black and white modules. The three large squares in the corners are position markers that let the scanner determine the orientation and scale of the code regardless of viewing angle. The smaller patterns encode format information, error correction level, and the actual data payload, which can be a URL, plain text, contact information, Wi-Fi credentials, or any string up to about 4,000 characters. One of the most underappreciated features is the built-in error correction, based on Reed-Solomon coding, which allows a QR code to remain scannable even if up to 30% of its surface is damaged, obscured, or deliberately replaced with a logo. This is why you can put a brand icon in the center of a QR code and it still works — the redundancy in the encoding absorbs the missing data.
For small businesses and event organizers, QR codes solve a handful of problems cheaply and without requiring any technical infrastructure. A restaurant can generate a code that links to a Google Doc menu and print it on a table tent for effectively zero cost. An event can encode a registration URL into a code on a poster, letting people sign up by pointing their phone at it rather than trying to remember a web address. A musician can link to their tip jar, a nonprofit can link to a donation page, a conference speaker can link to their slide deck. In each case, the QR code converts a physical moment into a digital action with a single gesture.
The resurgence hasn't been without friction. Poorly implemented QR codes are still common — codes that link to non-mobile-friendly pages, codes printed too small to scan reliably, codes that resolve to URLs that have since been taken down. And there are legitimate security concerns: because a QR code can encode any URL, a malicious code stuck over a legitimate one in a public place can redirect users to a phishing site. The same ease-of-use that makes QR codes convenient makes them a viable vector for social engineering.
But the underlying utility is real, and it's not going away. QR codes work because they solve the right problem at the right layer: bridging the gap between the physical world and a digital action in a way that requires nothing from the user except a phone they already have in their pocket. That's a lower bar than downloading an app, typing a URL, or remembering a code, and it's why QR codes survived the hype cycle that killed so many other technologies from the same era. If you need to create one, a QR code generator will get you there in about ten seconds.