Apparel has lots of variations, which makes barcoding feel complicated. It isn’t — here’s the simple rule.
One barcode per size and color
If you sell a shirt in 4 sizes and 3 colors, that’s 12 sellable variations — 12 unique barcodes.
Each combination is treated as a separate item by retailers and marketplaces.
Barcodes vs SKUs
A SKU is your internal stock code, which you design however you like. A barcode (GTIN) is the standardized public identifier that marketplaces ask for.
You’ll often use both: a readable SKU internally and a GTIN externally.
What marketplaces expect
Most apparel listings require a valid GTIN per variation. Assign genuine, unused numbers and map each to a specific size/color.
Keep a master sheet so your growing catalog stays duplicate-free.
Frequently Asked Questions
Do sizes need separate barcodes?
Yes — each size and color combination needs its own.
Is a SKU the same as a barcode?
No — SKU is internal; the barcode/GTIN is the public standard identifier.
How many barcodes for 4 sizes x 3 colors?
Twelve.
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