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Just enter your text, your URL, a SMS or vCard contact information. The QR code will be generated automatically as you type.
No. Most important is a good contrast between the light and dark modules / pixels. Furthermore, a colorized QR code should be no negative (in terms of color, the actually black pixels / modules have to be darker than the normally white pixels) as the dark modules / pixels contain the data and a negative will confuse many QR code readers.
