The greater the amount of data stored, the bigger the size. QR codes can hold up to 2953 bytes of data, 4296 alphanumeric characters, 7089 numeric characters, or 1817 Kanji characters. The ECL ...

Recently [mit41301] wondered about increasing the data capacity of QR codes, and was able to successfully triple the number of bits using color. He chose the new rectangular micro QR code (rMQR ...

Google will soon ditch SMS codes for two-factor authentication for Gmail accounts. QR codes will be used instead of SMS codes. This change will reduce the impact of rampant, global SMS abuse.

Instead of entering your number and getting a six-digit code via SMS, you'll see a QR code that you scan with your phone's camera. Richendrfer said Google is making this switch to "reduce the ...