GS1 Australia issues the barcode numbers (GTINs) Australian suppliers use. It also runs the National Product Catalogue (NPC), the data pool suppliers use to share product, packaging and logistics data with retailers and healthcare buyers. Retailers such as Woolworths receive new item and pricing data through it, so getting it right decides how quickly a new line goes live.
We see the same pattern on most Australian supplier catalogues we work on. The barcode is sorted, the NPC login exists, and the data behind it is weak. The case dimensions are a guess. The inner pack was never set up. The marketing copy lives in a spreadsheet nobody owns.
What does GS1 Australia do?
GS1 Australia is the Australian member organisation of GS1, the global body behind the barcode standards used in retail and healthcare. It has been supporting Australian industries since 1978. For most suppliers, three things matter.
Membership. To get barcode numbers in Australia you join GS1 Australia first. Its barcode standards FAQs say so plainly.
A company prefix and GTINs. Membership gives you a GS1 Company Prefix. You allocate Global Trade Item Numbers (GTINs) from that prefix, one for each distinct product and each packaging level. The GTIN is the key every trading partner uses to match your data to your stock.
Standards. GS1 publishes the rules for how barcodes are printed, how products are measured and how product data is exchanged. The NPC is built on those data exchange standards.
A warning on cheap barcodes. GS1 Australia says that if you buy barcode numbers from a reseller, you do so at your own risk. Once resold, a number is no longer managed by GS1. GS1 also says it cannot guarantee that a resold number stays unique, and it cannot validate those numbers for ecommerce. If you plan to sell through a major retailer or marketplace, start with your own company prefix.
What is the National Product Catalogue?
The NPC is GS1 Australia’s product data pool. GS1 describes it as a way to maintain and share product and item information with all your trading partners in real time. You publish once. Your trading partners receive the data from the catalogue rather than from a new line form per retailer.
It holds more than a product description. The NPC carries identification, packaging hierarchy, dimensions and weights, logistics data, regulatory attributes and digital product images. Each attribute is defined in the NPC user guide and data dictionary, which GS1 Australia and GS1 New Zealand maintain together.
The NPC is also part of a bigger network. GS1 runs the Global Data Synchronisation Network (GDSN), which it calls the world’s largest product data network. GS1 Australia describes the NPC as fully GDSN compliant.
Who uses it? GS1 Australia’s NPC pages point to three industry groups:
- Retail: food, grocery and liquor, where it carries item, pricing and on-pack data for supermarket and liquor buyers.
- Healthcare: with its own healthcare data quality framework and publisher checklist.
- Rail: listed alongside retail and healthcare on the NPC page.
Healthcare has a regulatory use too. The Therapeutic Goods Administration accepts UDI records submitted through GS1’s National Product Catalogue. It is one of four AusUDID submission methods. The TGA says it suits sponsors with a medium to high number of UDI records, or those already using the NPC.
Which retailers and buyers require NPC data?
The honest answer: read each buyer’s own supplier material, because the requirement sits in their trading terms, not in the NPC. Using the NPC is not a legal requirement. It becomes a commercial one when a buyer sets up new lines from it.
Here is what the published material shows. GS1 Australia runs NPC supplier onboarding programs for Woolworths and Coles suppliers. Its Woolworths NPC onboarding page says GS1 is working with Woolworths to help suppliers load and publish item and pricing information to Woolworths through the NPC. That page links to Woolworths’ own Partner Hub guides on article submission, price changes and NPC supplier training.
So before you range a new line, check three things in the buyer’s supplier portal:
- Whether new items must arrive through the NPC, or through a portal form, or both.
- Which attributes they treat as mandatory, beyond GS1’s core set.
- Whether they need images, pricing or regulatory data published through the NPC too.
The NPC data dictionary flags some attributes as Trading Partner Dependent. That means the buyer decides whether it is required. Two retailers can review the same product record and reject it for different reasons.
What data does the NPC need?
Think of an NPC record as a set of linked records, one per packaging level. Most submission problems start here.
The item hierarchy
Each packaging level has its own GTIN. The NPC’s trade item unit descriptor names the level: base unit or each, pack or inner pack, and case are the common ones. Each level links to the one below it, with the quantity it contains. A case of 12 might hold three inners of four eaches.
Pallet configuration is carried on the case. Attributes such as quantity of layers per pallet and items per layer tell the warehouse how your stock arrives.
Dimensions and weights
Height, width, depth and gross weight are needed at every level. GS1 sets out how to measure them in the GS1 Package and Product Measurement Standard. It defines which face is the front, how to orient the product and how to round. Measure the real product. Do not copy the carton spec from the factory drawing.
Packaging, marketing attributes and images
Beyond logistics, buyers want packaging type and materials, net content, country of origin, and sector data such as nutrition, allergens or container deposit details. They also want marketing copy and product images. The NPC Cookbook includes sector guides for grocery, liquor and healthcare, and a target data set that GS1 updates.
What NPC certification means
The term causes confusion. GS1 Australia’s NPC Certified Products program certifies software, not your products. It tests a solution’s ability to meet NPC data sets, validation rules and uploads. It is open to GS1 Australia Alliance Partners.
If you want your physical products measured and photographed, that is a different service. Through GS1 Studio, products are tested, measured, photographed and loaded onto the NPC. It is a practical way to fix weak dimensions and images across a large range.
Why do NPC submissions get rejected or delayed?
We see four causes again and again. None of them are NPC problems. They are product data problems that the NPC exposes.
The hierarchy is wrong. The case points to the each and skips the inner. The quantities do not multiply up. A GTIN is reused across two levels. The buyer’s system cannot build an order unit, so the line stalls.
The dimensions do not match the product. The data says 300mm and the case measures 320mm. Warehouses plan space from these numbers. A mismatch means rework, a re-measure, or stock that will not fit the slot it was planned for.
Mandatory attributes are missing. Some are mandatory for everyone. Others are mandatory for one buyer only. Teams often fill the GS1 core set and miss the trading partner extras, then find out from a rejection report.
GTINs are duplicated or unmanaged. The same GTIN appears on two products, or a resold number clashes with another company’s record. GS1 cannot guarantee uniqueness for resold numbers, so this risk sits with you.
The fix is upstream. Check the hierarchy and the dimensions before you publish, using the product data quality assurance rules you already apply to your website. GS1 offers an NPC Validator for the checks the catalogue runs. It will not tell you whether a measurement is true. Only the product can.
This is also why new line forms fail so often. The form collects the data once, under deadline pressure, and nobody owns it after the line goes live.
How does NPC data relate to your PIM?
Your PIM stays the source. The NPC is one more channel, alongside your website, marketplaces and distributor feeds. If you key data straight into the NPC, you end up with two versions of the truth and a reconciliation job every time a pack changes.
A sound setup looks like this:
- Model the packaging hierarchy in your PIM, with a GTIN per level and the quantity links between them.
- Hold measured dimensions and weights against each level, with a note of who measured them and when.
- Map your PIM attributes to the NPC data dictionary, including the trading partner attributes your buyers need.
- Publish to the NPC through GS1’s own tools or through a certified solution partner. GS1 lists the certified partners on its NPC Certified Products page.
- Treat NPC feedback and rejection reports as data quality signals that flow back into the PIM.
If your suppliers send you the data, the same logic applies one step earlier. A clean supplier onboarding process captures the hierarchy, dimensions and images in a structured template before anything reaches your PIM. Our supplier data onboarding team, delivered from our centre of excellence in Hyderabad, does this work for Australian catalogues.
The marketing side of the record needs care too. NPC copy and images often end up thinner than what you publish on your own site. Our product content enrichment service writes once in the PIM and publishes the same approved content to every channel, the NPC included.
Get the hierarchy and the dimensions right first. Everything else is easier once those two are true.
Frequently asked questions
GS1 Australia’s product data pool. Suppliers publish product, packaging and logistics data once, and retailers and other buyers receive it from there.
It is not law. It becomes a requirement when a buyer sets up new lines from NPC data, so check each retailer’s own supplier requirements before you range a product.
Join GS1 Australia and allocate GTINs from your company prefix. GS1 warns that numbers bought from resellers are no longer managed by GS1 and may not stay unique.
A GS1 Australia program that certifies software solutions against NPC data and validation requirements. If you need products measured and photographed for the NPC, GS1 offers that separately through GS1 Studio.
Yes, through GS1’s tools or a certified solution partner. The PIM stays the source and the NPC is one of the channels it feeds.
Yes. Medical device sponsors can use it to submit records to the TGA’s Australian UDI database (AusUDID).
Our free Product Data Performance Snapshot scores 50 of your SKUs for completeness, structure and accuracy, so you know which lines to fix before your next NPC submission. It comes back within five working days.