> Every string encodes to the same amount of “squares” (...) Actually the size of QR Code doesn't depend only on length of the string but also on charset used.

> Every string encodes to the same amount of “squares” (...) Actually the size of QR Code doesn't depend only on length of the string but also on charset used. For instance, the URLs generated at bit.ly are case sensitive, to encode the qr code you have to use "binary" input mode. For KUAG I'm using "Alphanumeric" input mode, it reduces the size of the QR code I'm generating however I restricted to a smaller subset of character. I understand it looks like a paradox; but a bit.ly shortened url leads to a bigger QR code than KUAG (even if the string is longer) See https://en.wikipedia.org/wiki/QR_code#Storage https://en.wikipedia.org/wiki/QR_code#Storage for more details. Note: the shortened url I display is 'lowered' for esthetical reason. Edit: I forgot to mention the error-correction. But I don't think it's fair compare with other shorteners if they are not using the same error-correction level.