A QR (Quick Response) code is a two-dimensional barcode that stores information in a grid of black-and-white modules. Unlike a 1D barcode that holds a single line of numbers, a QR code can contain thousands of characters — URLs, plain text, contact details, and Wi-Fi credentials.
Smartphones decode QR codes through their rear camera and built-in image processing. The camera detects the three finder squares in the corners, orients the pattern, and reads the data modules. Within a fraction of a second it opens the encoded link, text, or vCard.
Error correction is what makes QR codes resilient. A code can still be scanned when partly dirty, folded, or covered by a small logo, because up to about 30% of the pattern can be reconstructed. That is why you can safely place a logo in the center of a code.
For businesses, QR codes are the cheapest bridge between physical media (packaging, posters, menus, business cards) and digital destinations. A single printed code can open a website, a payment page, or a sign-up form at near-zero cost.
Want to try it? Our free QR code generator runs entirely in your browser — no account, no watermark, and the code never expires.
If you plan to print your code, read our guide on QR code sizes and print DPI next.