Illustrative situation
A brand ships its first retail order and the retailer asks for scannable barcodes on every hang tag and carton label. The brand has only internal style codes and has not yet registered with any barcode body.
Main answer
Many retailers and marketplaces require GTIN barcodes on products and cartons, and GS1 is the organisation that issues company prefixes so that the numbers belong to your brand. Each colour and size variant normally needs its own number, so plan the numbering before labels and cartons are printed, and check the retailer’s own requirements.
What GS1 barcodes are
GS1 standards define barcodes and the numbers they carry, called GTINs, which identify a product uniquely across supply chains. GS1 member organisations in each country issue company prefixes, and a lookup lets others check who owns a barcode. Barcodes can be printed on hang tags, labels or packaging, and scan at the point of sale and in warehouses.
When you need them
Not every sale needs a barcode, but retailers, marketplaces and distributors often do. Check each customer’s rules, including whether they accept GS1-issued numbers only and how they want them displayed. If you sell direct online only, you may not need them at first, but you may later.
Numbering variants
A product that varies by size or colour normally needs a separate GTIN for each variant, so a style in four sizes and three colours needs twelve numbers. Plan this early with your SKU structure and keep a master sheet. Do not reuse numbers for different products.
Size and placement
Barcodes need a quiet zone around them and a minimum size and contrast to scan well. Put them on a flat part of the hang tag or label, not across a fold or seam, and test scanning on the actual material before printing in volume.
Cartons and labels
Cartons can carry a carton-level barcode and a packing list reference, which your retailer may specify. Put hang tag barcodes in a consistent place and size, and check scanning on samples. Give the factory a file with numbers per variant. See SKU structure and carton labels and packing lists.
Fact, recommendation, uncertainty
- Established fact
- GS1 standards define barcodes and the GTIN numbers they carry, and GS1 member organisations issue company prefixes.
- Recommendation
- Check each retailer’s requirement, register with GS1 if needed and plan one number per colour and size.
- Uncertainty
- Requirements differ by retailer and market, so confirm them with each customer.
Sources and further reading
Sources checked on 24 October 2026. Standards bodies sell the full texts; we cite what their public pages state. General information, not legal or technical certification advice.
More perspectives from the team
Three further views on the same question, each by function. They add conditions and limits to the main answer; they are editorial notes, not customer reviews.
Sino Finetex Editorial Team Sourcing
Ask the factory to print barcodes from your file and to scan-test samples before bulk. Limit: a poor print can fail at the retailer. Ask the factory for a scan test of barcode proofs on the real label stock.
Sino Finetex Editorial Team Product selection
Decide your numbering structure before the first order, since changing it later is costly. Limit: a messy structure causes stock errors. Choose a tag position that does not fold when garments are packed.
Sino Finetex Editorial Team Quality & care
Scan a sample from each carton at inspection and compare numbers with the packing list. Limit: use a real scanner, not only a phone. Scan a sample of each variant at inspection and check the product matches.
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