A QR code — Quick Response code — is a two-dimensional barcode that stores data in a grid of black and white squares. Point a phone camera at one and the encoded content opens instantly: a website, WiFi login, contact card, payment page or plain text.
"Quick Response". The name is literal: unlike the striped barcodes on groceries, which need a precise side-on sweep, a QR code reads from any angle in a fraction of a second.
Masahiro Hara, an engineer at Denso Wave (a Toyota subsidiary), invented the QR code in Japan in 1994 to track car parts through factories. Denso Wave patented it but chose never to enforce the patent — which is why the format became a free global standard instead of a licensing product.
Each small square (a "module") is a bit — black or white, one or zero. The three large corner squares tell the scanner where the code's edges are and which way is up; the smaller alignment square keeps long codes readable at an angle. Everything else is data plus error correction — mathematical redundancy that lets a code survive up to 30% damage or coverage, which is why a logo can sit in the middle.
The everyday list: restaurant menus, guest WiFi, digital business cards, payments, event tickets, parcel tracking, review requests and app downloads. A standard code holds up to about 3KB — enough for roughly 4,000 characters of text or any length of URL.
A static code never expires — the data is baked into the pattern. What can die is the thing it points to. The full story: do QR codes expire?
Same family, different dimension: a barcode stores ~20 digits in stripes; a QR code stores thousands of characters in a 2D grid and reads from any angle.
Yes — the format is an open standard and our generator is free with no watermark or expiry.
The code is just data; the risk is the link inside, same as any link. Phones show the URL before opening — check it, exactly as you would in an email.
20 types, logos, colours and print-ready files — free, no signup, generated in your browser.
Open the generatorMake it editable first — £10 once, repoint forever, no subscription.