A Free Educational Resource Created by Carnegie Mellon University to Empower You to Secure Your Part of Cyberspace

Quick Response (QR) Code

A two-dimensional barcode that mobile phones can quickly scan

A "quick response" (QR) code is a two-dimensional barcode that mobile phones can quickly scan to receive information about a person, product or business.

QR codes can be found across all types of media, from magazines and Web sites to television ads and T-shirts. By using an arrangement of squares that encodes data horizontally and vertically, QR codes can store much more data than standard barcodes, including Web addresses, coupons, directions and text messages, among other information.

If your mobile phone has a QR reader, you can take a picture of a QR code, and the data inside the code will be sent to your phone within seconds. For example, if you scan a QR code on a product advertisement, your phone could direct you to the product's Web site and a coupon offer. Or, if you scan a QR code on a business card, your phone could automatically save the person's contact information in your address book.

The following is an example of a QR code:

Example of a QR code

Most smartphones, including iPhones and Android devices, support QR reading software. If a QR reader is not pre-installed on your phone, you can download a reader at a Web site such as Kaywa.com, which offers products for mobile networking. You can also create your own QR codes at Kaywa and other similar Web sites.



My home page