AI Product Data Automation for Marketplace Visibility in 2026
Offers are found through structured data: a valid EAN, a title within limits, category parameters, compliant photos and GPSR information. AI helps with categories, attributes and translations, but identifiers and safety data must come from the source.
Marketplace visibility starts with product data: a valid EAN (GTIN), a title within the marketplace's limits, the right category with its parameters, compliant photos and GPSR safety information. AI can fill gaps in categories, attributes and translations, but identifiers and legal data must come from the source. GAPLI applies these rules automatically when it lists products from partner wholesalers; figures are as of 8 Oct 2026.
Key takeaways
- Allegro matches offers to products in its catalogue by GTIN (EAN) or manufacturer part number, so a missing or wrong EAN breaks the link between your offer and the product page.
- On Allegro an offer title must be 12 to 75 characters long and contain at least 3 words.
- Since 13 December 2024 Allegro requires a responsible person and safety information in offers under the EU General Product Safety Regulation (GPSR).
- AI is useful for categories, parameters extracted from supplier text and translations; it must never invent an EAN, safety data or technical specifications.
- Allegro requires sellers to label photos generated or substantially altered with AI, in line with the EU AI Act.
Why does product data decide whether an offer is found?
Marketplaces organise search around structured data. Allegro links offers to a catalogue product by GTIN or manufacturer part number, the category determines which parameters an offer needs, and buyers filter results by those parameters. An offer with gaps can be rejected, missing from filtered results or shown apart from the matching product.
Allegro's developer documentation describes how an offer is matched to a catalogue product by GTIN or MPN, and how a new product is proposed with a name, category, parameters, images and description when it does not exist yet (Allegro Developer). The same structured fields are what other machine readers, from price comparison sites to AI shopping assistants, can parse.
Data quality is a separate topic from automation of the whole order workflow; for that, see our guide to AI dropshipping automation. This article covers only the product data that goes into a listing.
What product data does a marketplace listing need in 2026?
A complete listing combines an identifier, a compliant title, a category with its required parameters, photos that meet the marketplace's rules, a description, GPSR safety information and return, complaint and warranty terms. The table uses Allegro's published rules because they are explicit; other marketplaces have similar fields with their own limits.
| Element | Allegro rule | Source |
|---|---|---|
| GTIN (EAN) or MPN | Used to match the offer to a catalogue product | Allegro Developer |
| Title | 12–75 characters including spaces, at least 3 words (minimum in force since 7 May 2025) | Allegro Developer news |
| Photos | Longer side at least 500 px, maximum 2560 × 2560 px; no seller texts or logos; up to 16 photos on a business account (most categories) | Allegro Help |
| GPSR data | Responsible person and safety information required from 13 December 2024 | Allegro Developer news |
| Category and parameters | Parameters are set per category; a new product proposal needs category, parameters, images and description | Allegro Developer |
| Description | Only HTML tags allowed by Allegro may be used | GAPLI Allegro integration |
| Return, complaint and warranty terms | Attached to every offer | GAPLI Allegro integration |
Marketplace rules change. Check the linked pages before a large listing project, because a limit that was true last year can reject a batch of offers today.
Why is the EAN the most important field?
An EAN, part of the GS1 GTIN family, identifies one specific product across all sellers. GS1 describes the GTIN as the number under a product's barcode that is unique, verifiable and global, with digits that encode the licensing GS1 organisation, the company that applied it, the item number and a check digit (GS1 Support).
Because the number is tied to a specific product and brand owner, it cannot be generated or "fixed" by AI. Three practical rules follow:
- Never invent or reuse an EAN. A made-up number may match someone else's product, which is worse than no match.
- Keep the supplier's EAN unchanged. Reformatting, trimming leading zeros or merging variants under one code breaks catalogue matching.
- Treat missing EANs as a sourcing problem. Ask the supplier, or decide not to list the product on channels that require one.
In GAPLI, products without an EAN are skipped when listing on Allegro automatically, and the Empik integration (beta) matches offers to Empik products by EAN as well. See the glossary entry on EAN (GTIN) for the short version.
What does GPSR require in an online offer?
The EU General Product Safety Regulation, Regulation (EU) 2023/988, has applied since 13 December 2024. For online offers it means the buyer must see who is responsible for the product and its safety information. On Allegro this translates into two fields, the responsible person and safety information, required since that date.
According to Allegro's developer announcement, safety information can be supplied as text or attachments, or marked as not applicable. The full legal text is published in the EU Official Journal. When the manufacturer is based outside the EU, an EU-based responsible person has to be indicated.
How this is handled at GAPLI and on Erli:
| Channel | GPSR handling |
|---|---|
| Allegro (via GAPLI) | GPSR data is attached to offers automatically, together with return, complaint and warranty terms |
| Erli (via GAPLI) | The seller sets up GPSR data (manufacturer and responsible person) on the Erli account before selling |
| TikTok Shop, beta (via GAPLI) | Products are sent with GPSR data for Polish shops |
Mandatory product information will keep growing; our guide to the EU Digital Product Passport in dropshipping covers the next set of requirements. The glossary has a short definition of GPSR.
Where does AI improve product data, and where must it not guess?
AI improves product data where the task is interpreting or rewriting text: choosing a category, extracting parameters from a supplier description, shortening a title to the character limit and translating. It must not create facts that only the manufacturer can provide, such as identifiers, certifications, safety warnings, materials or dimensions missing from the source.
| Task | AI suitable? | Safeguard |
|---|---|---|
| Category suggestion | Yes | Check new category assignments in batches |
| Parameters stated in the supplier's description | Yes | Only copy values present in the source text |
| Title rewrite within 12–75 characters | Yes | Keep brand, model and key attribute; no promotional claims |
| Translation for another market | Yes | Keep units, sizes and model numbers unchanged |
| EAN, MPN | No | Must come from the supplier or manufacturer |
| GPSR responsible person and safety information | No | Must come from the manufacturer or importer |
| Dimensions, materials, certifications not in the source | No | Leave empty or ask the supplier |
| Product photos generated or altered with AI | With labelling | Allegro requires such images to be marked |
The last row is now a marketplace rule. Allegro's photo guidelines state that, under the EU AI Act, a seller publishing an image generated or substantially altered with AI must inform buyers, and the label is available in the catalogue, the listing form and the API (Allegro Help).
How does GAPLI automate product data for its sellers?
GAPLI imports partner wholesalers' ranges into one catalogue, so sellers do not handle product feeds themselves, and applies channel rules when it lists a product. As of 8 Oct 2026 the catalogue had 980,891 products available for sale from 161 active wholesalers, and 1,250,796 catalogue items were updated in the previous 24 hours (GAPLI database).
What happens to product data on each live channel, as described on GAPLI's integration pages:
| Channel | How product data is handled |
|---|---|
| Allegro | Offers matched to Allegro product cards by EAN; GPSR data and return, complaint and warranty terms attached; products without an EAN, with blocked phrases, in blocked categories or sanctioned are not listed; one account cannot list the same catalogue product twice |
| Erli | Products sent through the API with automatic category mapping |
| WooCommerce | Title, description, variants, categories and images sent to the store; import works by SKU, so a resend updates instead of duplicating |
| Shopify | Title, description, vendor, SEO fields, images and tags; categories become automated collections; one variant per product |
| Aderlo | Offer content and price come from the GAPLI catalogue |
Where AI is involved: GAPLI runs a shared category system with AI-assisted automatic categorisation, and the paid plans list "AI Category Generator" from the Mini plan and "PIM" from the Pro plan, as named on the GAPLI pricing page. On beta channels, eMAG offers get AI-translated names and descriptions, and TikTok Shop fills missing category attributes with AI using your own OpenRouter key.
Visibility also depends on offers staying accurate after they go live. GAPLI ends an Allegro offer when stock runs out and reactivates it when stock returns, holds suspiciously large wholesale price drops for review, and lists new offers gradually through the Listing Autopilot rather than all at once.
How do you audit your product data quality?
Audit a sample before you scale: take your top 50 offers by traffic and 50 random ones, and check each against the same short list. Look in particular for missing identifiers, titles cut off at the limit, empty required parameters and missing GPSR data. Fix the source data, not individual offers, so the fix survives the next import.
| Check | How to check | Typical fix |
|---|---|---|
| EAN present and valid | Compare with the supplier file; check digit valid | Request missing codes; stop listing products without them where required |
| Offer linked to the right catalogue product | Open the offer and compare brand and model | Correct the EAN or MPN at source |
| Title within limits and readable | 12–75 characters, at least 3 words on Allegro | Shorten to brand + model + key attribute |
| Required parameters filled | Marketplace listing form or API validation | Map supplier attributes to marketplace parameters |
| Photos compliant | Size, no seller text or logo, AI label where needed | Replace or label images |
| GPSR data complete | Responsible person and safety information present | Get data from manufacturer or importer |
| Description uses allowed formatting | Marketplace validator | Strip disallowed HTML |
Repeat the audit after any supplier changes its feed or a marketplace changes its rules. With GAPLI, opening an account and the Start plan are free (1 store, 1,000 products per store); you can create an account to see how catalogue products map to your channel.
Frequently asked questions
Can I list a product without an EAN?
It depends on the marketplace and category, but without an EAN the offer cannot be matched to a catalogue product by its code. In GAPLI, products without an EAN are skipped when listing on Allegro automatically. For Allegro the practical answer is to list only products with a valid code.
Can AI write my product descriptions?
Yes, if it works only from the supplier's facts and you check the output. Let it restructure and shorten text, translate and pick a category, but do not let it add dimensions, materials, compatibility or certifications that are not in the source.
Do I have to label AI-generated product photos?
On Allegro, yes: images generated or substantially altered with AI must be marked, in line with the EU AI Act. The label can be set in the catalogue, in the listing form or through the API.
Does complete product data guarantee a higher ranking?
No tool can guarantee ranking, because search position also depends on price, delivery, seller rating and demand. Complete data makes an offer eligible for catalogue matching and filters, which is the precondition for being found at all.
Sources
- GAPLI data (catalogue size, active wholesalers, catalogue updates in 24 h, channel handling of product data): GAPLI database and integration pages, as of 8 Oct 2026.
- Allegro Developer: Listing an offer assigned to a product, Minimum title length change, GPSR: responsible person and safety information.
- Allegro Help: Rules for photos in the gallery and description.
- GS1: What is a GS1 GTIN?
- EU: Regulation (EU) 2023/988 on general product safety.
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GAPLI Team
E-commerce automation & dropshipping insights.