GTIN, Serial, or Batch? Choosing the Right Identifier for Your DPP

The identifier decision you can't postpone#

When implementing a Digital Product Passport under the EU's Ecodesign for Sustainable Products Regulation (ESPR), one of the first technical choices is deceptively simple: at what level do you identify your products?

The answer shapes everything downstream — your data architecture, your factory workflows, your ability to prove sustainability claims, and your compliance costs. Yet many brands default to the familiar GTIN without understanding the trade-offs.

Three levels of identification#

GTIN: the baseline

A Global Trade Item Number (GTIN, often encoded as an EAN-13 barcode) identifies a product at the SKU level. It's already in your systems — your warehouse, your POS, your e-commerce catalogue.

For DPP purposes, a GTIN-linked passport can provide static information: material composition, care instructions, country of origin, certifications. What it cannot do is distinguish between two identical shirts or trace where a specific unit's cotton was grown.

Batch: the pragmatic middle ground

Batch or lot numbers group items that share production conditions — same fabric roll, same dye lot, same factory shift. Many manufacturers already track batches for quality control and recall management.

A batch-level DPP can link to supplier invoices, test certificates, and process data for that specific production run. If a quality issue emerges, you can narrow the scope. The European Commission's draft delegated acts for textiles reference batch-level data as sufficient for several disclosure requirements (European Commission, 2024).

Serial: full item-level traceability

Serialisation assigns a globally unique identifier to each individual garment — often via QR code, NFC tag, or RFID. This is the gold standard for traceability: you can follow one shirt from fibre to consumer to end-of-life.

Item-level identification enables resale authentication, take-back programmes, and granular impact data. It's also what regulations like France's AGEC anti-waste law increasingly expect for certain product categories (Légifrance, 2020).

Comparing the three approaches#

When to use which#

GTIN is sufficient when:

• Your products are commodity basics with simple, stable supply chains
• You're only meeting minimum disclosure requirements
• Traceability claims are not part of your brand positioning

Batch makes sense when:

• You source from multiple suppliers for the same SKU
• Quality variation between lots is meaningful
• You want recall capability without full serialisation cost

Serialisation is necessary when:

• You make high-value or limited-edition pieces
• You operate take-back, resale, or repair programmes
• Your brand promise includes "know exactly where this item came from"
• Downstream markets (France, potentially more) require it

The ESPR framework does not prescribe a single approach. Article 9 of the regulation specifies that the DPP must use a "unique product identifier" but leaves granularity to sector-specific delegated acts (Official Journal of the European Union, 2024). For textiles, expect batch-level to become the de facto minimum, with serialisation required for specific claims.

The cost equation#

Serialisation is not free. A 2023 study by GS1 estimated that item-level tagging adds €0.05–0.30 per unit depending on technology and volume, plus integration costs (GS1, 2023). For a brand producing 100,000 units annually, that's €5,000–30,000 in direct costs — before accounting for workflow changes.

But the ROI calculation changes when you factor in:

• Reduced counterfeiting losses
• Resale commission revenue on authenticated secondhand
• More accurate sustainability reporting
• Faster, cheaper recalls