A QR codes is two-dimensional code, very much like a barcode, that is designed to be read or scanned by a smartphone. The two-dimensional black and white patterns encode text or other data (for example, a URL link to a web site or a phone number). According to Wikipedia, data storage on a #QRcode is
7089 characters (numeric)
4296 (alphanumeric)
2953 (binary)
(via wikipedia)
Link: QR code data capacity
