GDSN / GS1: syncing product data with major retail chains

GDSN — Global Data Synchronisation Network. If you sell to major retailers (Carrefour, Leclerc, Auchan, Intermarché, etc.), you’ve probably come across requests for “GS1 synchronisation”. Here’s what that actually means and how your PIM interfaces with the GDSN network.

What is the GDSN?

The GDSN is a standardised global network for the exchange of product data between suppliers and retailers. It is based on standards defined by GS1, the international organisation that manages EAN/GTIN barcodes.

In practical terms, the GDSN enables a supplier to share their product data (specifications, packaging, images, logistics data) with their retailer customers in a standardised way — once, correctly, without exchanging Excel files via email.

Major French retailers use GDSN data pools such asAgena3000(Système U, Leclerc, Intermarché, Auchan, Carrefour) orSalsifyto receive product data from their suppliers.

GDSN stakeholders

• GS1— the organisation that defines the standards (GS1 France for France)
• Data pools— certified operators that store and synchronise data (Agena3000, Salsify, 1WorldSync, Syndigo…)
• Suppliers (Publishers)— publish their product data to a data pool
• Retailers (Subscribers)— subscribe to their suppliers’ data via the same data pool or via inter-data pool connections

Data exchanged via GDSN

The GDSN standard (based on the GPC format — Global Product Classification) covers:

• Identification: GTIN (EAN), supplier GLN, brand, manufacturer reference
• Description: title, short description, long description
• Packaging: dimensions (L×W×H), weight, packaging type, order unit
• Packaging hierarchy: consumer unit → sales unit → pallet
• Images: product photos, technical drawings, packaging images
• Nutritional data (food)
• Regulatory data: customs codes, country of origin, allergens
• List prices and commercial terms (in some cases)

Why it’s complex without PIM

The GDSN format is highly structured and demanding. Each attribute has a name, a type, a cardinality and validation rules defined by GS1. The main problems without PIM :

• Manual mapping— your internal product data does not have the same names as the GDSN fields. Manually mapping 200+ attributes for each retailer is time-consuming and prone to errors.
• Data quality— data pools reject publications that do not comply with GS1 validation rules. A single incorrectly filled-in field blocks the entire publication.
• Updates— when an attribute changes (weight, packaging, best-before date), you must republish to the data pool and notify all subscribed retailers.
• Multi-retailer— each retailer may have its own additional requirements beyond the GDSN standard (sector-specific attributes, additional images ).

How ProductsManager interfaces with GDSN

ProductsManager offers two GDSN integration modes depending on your situation:

Data pool export mode

If you are a supplier and need to publish to a data pool (Agena3000, Salsify, 1WorldSync) :

1. You maintain your product data in the PIM — a single source repository
2. ProductsManager generates GS1 XML files (CIN format — Catalogue Item Notification) compliant with the GDSN standard
3. The file is uploaded to your data pool via API or FTP (depending on the operator)
4. Subscribed retailers automatically receive updates

Import mode from data pool

If you are a retailer and receive GDSN data from your suppliers:

1. ProductsManager connects to your data pool as a subscriber
2. New supplier publications are automatically imported into the PIM
3. GDSN data is mapped to your internal PIM data model
4. You enrich and complete the data before publishing it to your sales channels

GDSN and barcodes: understanding GTINs

The GTIN (Global Trade Item Number) is the central product identifier in the GDSN. A single product may have several GTINs depending on its packaging level:

• GTIN-13 (EAN-13): consumer unit
• GTIN-14: sales unit or pallet (with a different prefix)
• GTIN-8 (EAN-8): small products with limited space for the barcode

ProductsManager manages the GTIN packaging hierarchy and synchronises it correctly to the data pool — a frequent source of errors when managed manually.

Who needs to implement GDSN?

Major retailers are increasingly requiring their suppliers to adopt GDSN. If you sell or wish to sell to Carrefour, Leclerc, Intermarché or Système U, you will likely receive a request for GDSN listing as part of your supplier onboarding process.

For SME suppliers who do not yet have a PIM, this is often the trigger that justifies the implementation of a structured product repository — rather than managing the GDSN via Excel files.