What is a QR code?
A QR code (Quick Response code) is a two-dimensional barcode that stores information in a machine-readable pattern of black and white squares. Originally invented in 1994 for tracking automotive parts, QR codes have become one of the most widely used contactless technologies in the world. A standard smartphone camera can scan a QR code in less than a second and instantly open a website, share a contact, connect to Wi-Fi, or display a piece of text.
Compared to a traditional one-dimensional barcode, a QR code can hold thousands of characters and remain scannable even when partially damaged thanks to built-in error correction. This makes QR codes ideal for both digital screens and printed materials, from business cards to billboards.
GreatQR is a free online QR code generator that lets anyone create high-quality, fully customizable QR codes directly in the browser — no account, no installation, and no data ever leaves your device.