What is a QR Code? Definition, Uses, and How to Create One

What is a QR Code?

A QR code (Quick Response code) is a two-dimensional barcode that can store information such as URLs, text, contact details, or Wi‑Fi credentials. Unlike traditional barcodes that are read in one direction, QR codes can be read both horizontally and vertically, which allows them to hold much more data.

QR codes were invented in Japan in 1994 by Denso Wave for tracking parts in vehicle manufacturing. Today they are used worldwide for marketing, payments, event check-in, restaurant menus, and sharing links or contact information.

How Do QR Codes Work?

When you scan a QR code with your phone camera or a dedicated app, the pattern of black and white squares is decoded into readable information. Most smartphones can read QR codes directly from the camera app—no extra download needed.

The code can encode different types of data: a website URL, plain text, a vCard (contact), calendar event, email, SMS, or Wi‑Fi network details. Our free QR code generator supports URL, text, and Wi‑Fi QR codes so you can create them in seconds.

Why Use a QR Code?

QR codes make it easy to share information without typing. Customers can scan to open a menu, join Wi‑Fi, or visit a landing page. Businesses use them for promotions, product information, and contactless payments. They are fast, reliable, and work offline for pre-encoded data like Wi‑Fi passwords.