QR codes explained: how they work and how to use them safely
QR codes are everywhere — on menus, posters, packaging and payment screens. But what do they actually contain, and how do you make one that always scans? This guide covers the essentials in plain language.
What a QR code stores
A QR code is a two-dimensional barcode that holds text. That text can be a web link, a plain message, contact details, or special-format data such as a Wi-Fi network. When you scan it, your phone reads the text and decides what to do — open a link, join a network, or show the message. Scanning the code itself does not need an internet connection; only opening a website does.
Static vs dynamic codes
A static code stores the data directly, so it never expires and keeps working forever — but you cannot change where it points after printing. A dynamic code stores a short redirect link you control, which lets you change the destination later, usually as a paid service. For most uses — a Wi-Fi password, a menu link, an event page — a free static code is all you need. If you may need to edit the target, point the code at a redirect URL you own.
Make codes that always scan
Keep strong contrast — dark code on a light background — and avoid inverting the colours. Leave a clear quiet zone (margin) around the code, and print it large enough for the scanning distance: a rough rule is at least one tenth of that distance. For print, download an SVG so it stays razor-sharp at any size.
Try it: generate QR codes for links, Wi-Fi and more with QRBloom →