How to Obtain a UPC Code: 7 Steps (with Pictures) - wikiHow
1. Choose a design for your barcode. The safest option for easy scanning is black bars on a white background, but you can also choose blue bars and yellow or red backgrounds. The barcode itself should be between 1.1875 in × 0.813 in (3.016 cm × 2.065 cm) and 2.92 in × 2.04 in (7.4 cm × 5.2 cm), with unprinted space to the left and right for ...