They do exactly that! However it depends on the type of card, so if you just start typing '1234567' it is not a valid card number and is unformtted. Try enterin

They do exactly that! However it depends on the type of card, so if you just start typing '1234567' it is not a valid card number and is unformtted. Try entering something that starts '42' (for a Visa debit card) and it will be formatted as such, in four groups of four digits. They also recognise AMEX cards and format appropriately, try '345612346712348' for example.