6. How small can I make a barcode?

Barcodes can come in a wide range of sizes and can get down to a 1/8th inch square when using a 2D code. There is a trade-off since making such a small code can limit the number of characters you use. This will require a high-resolution label printer to ensure the quality of the print is still readable by a scanner. Also, the smaller a code becomes the more difficult it is to read.