Creates a QRcode containing a text string.
Creates a QRcode that sends an SMS message to a phone number.
Creates an Email QRcode. The QQcode can hold the e-mail address, subject, as well as the body of the email.
Creates a QRcode with a phone number to make a call.
Creates a MeCard business contact QRcode.
Creates a PayPal Buy-Now button. This QRcode is an URL that redirects to a PayPal buy-now page.
Creates a geolocation QRcode. You need the latitude and longitude attributes which can be located with Google Maps.
Creates a QRcode to be read by phones and connect to your Wifi network.
QR codes are a popular type of two-dimensional barcode. They are also known as hardlinks or physical world hyperlinks.
QR codes store up to 4,296 alphanumeric characters of arbitrary text. This text can be anything, for example URL, contact information, a telephone number, even a poem! QR codes can be read by an optical device with the appropriate software. Such devices range from dedicated QR code readers to mobile phones.
For more information check out Google's QR codes documentation.