Barcode Guides
Which barcode to use, how the numbers work, and how to print barcodes that scan.
What Is a UPC Code? The 12 Digits Explained
A UPC is the 12-digit number under a product's barcode. Learn what each digit means, who uses UPCs, and how a UPC differs from a SKU.
How to Get a UPC Code for Your Product
Buy UPC codes from GS1 US as single numbers or a company prefix. See how they compare, why resold UPCs are risky, and what Amazon's GTIN exemption is.
Types of Barcodes: 1D and 2D Formats and Their Uses
A plain guide to UPC, EAN, Code 128, Code 39, ITF-14, GS1-128, QR, Data Matrix and PDF417, with a table of where each barcode type is used.
What Is a GTIN? GTIN-8, 12, 13 and 14 Explained
A GTIN is the number behind every UPC and EAN. Learn the four GTIN lengths, how they relate, and which barcode prints each one.
Barcode Check Digit: How to Calculate It (Mod 10)
Step-by-step mod-10 check digit calculation for UPC and EAN barcodes, with a fully worked example you can verify by hand.
Amazon Barcodes: UPC, GTIN Exemption and FNSKU Labels
Know the difference between the UPC or GTIN that creates your Amazon listing and the FNSKU label for FBA, plus how to print FNSKU labels on 30-up sheets.