QR codes are surrounded by blank space, the quiet zone, to help the computer determine where the QR code begins and ends. QR codes can include an optional logo in the middle.

QR codes are a close cousin of the bar codes on product packaging that cashiers scan with infrared scanners to let the checkout computer know what products are being purchased.

QR codes can store longer strings of information, exceeding the 20-character limit of barcodes. Barcodes are limited to alphanumeric characters, whereas QR codes can also include binary and kanji.