Identifiers
Check GTIN, MPN and brand across your entire catalogue
Identifiers are how Google knows your product is the same product.
Identifiers decide whether your listing joins the competition for a known product or sits outside it. A missing or invalid GTIN quietly limits reach, and an invalid one is worse than none at all. Webshop Vitals checks presence, validity and internal consistency across every product it can read.
Free scan, no credit card, results in minutes.
Identifier gaps hold products back quietly
- Branded item submitted with no GTIN
- Barcode with an invalid check digit
- Brand field holding the shop name
- Two products sharing one identifier
The problem
Identifier problems are silent restrictions
Google rarely stops a listing outright for a missing identifier. It limits it. The product stays in the account looking healthy while reaching a fraction of the audience it should, and nothing in the interface tells you how much you gave up.
- Products marked as limited rather than disapproved
- Barcodes that were typed by hand and never validated
- Own brand products incorrectly submitted with placeholder identifiers
- Brand fields containing a shop name instead of a manufacturer
What we check
Inside the gtin, mpn and brand checker
Every check below runs on your real store and reports findings you can act on, with the affected products named.
Presence
Which products carry a GTIN, an MPN, a brand, or none of the three.
Checksum validity
GTIN values validated by structure and check digit, so a typo is caught before Google catches it.
Format correctness
Length and character checks for GTIN-8, GTIN-12, GTIN-13 and GTIN-14.
Brand plausibility
Brand fields that hold a store name, a category or a placeholder rather than a manufacturer.
Duplicate identifiers
The same GTIN used across different products, which confuses matching for all of them.
Own brand handling
Products you manufacture yourself, which should declare that rather than invent an identifier.
Use this as your own checklist
0 of 5How it works
Three steps from question to answer
No plugin to install, no code to add, and nothing to change on your store.
- 1
Collect identifiers
From structured data, from the page and from the feed record where available.
- 2
Validate structurally
Check digits and formats are verified locally, so problems appear before submission.
- 3
Group by fix
Findings separate missing, invalid, duplicated and misused identifiers.
The report
What this check looks like in your dashboard
Findings land next to the score they moved and the products they affect, so a result always has somewhere to go next.
Website Readiness
89out of 100
- Product structured data30% 76
- Crawlability20% 97
- Product content20% 98
- Trust and merchant info15% 87
- AI commerce readiness15% 96
Products
Sorted by data quality| Product | Quality | Status |
|---|---|---|
3D & Collagen Snow Solution SKU ISOV-3DC-01 | 100 | Approved |
pH Balance Cleansing Cream SKU CORTHE-PH-08 | 80 | Limited |
Anti-Wrinkle Eye Mask SKU not set | 55 | Disapproved |
Holy Grow Lash Serum SKU BLOSSCO-LS-02 | 100 | Approved |
Since your last scan
- 7
- Issues fixed
- 2
- New issues
- 1
- Returned
- +4
- Readiness
Structured data returned on 24 products after a theme update. Caught the same day.
What you get
What changes after the first scan
Concrete outputs, not a grade with no next step.
- A list of products limited by identifier problems, with the reason for each
- Invalid barcodes caught by check digit rather than by rejection
- Duplicate identifier collisions surfaced across the catalogue
- Clear separation between products that need an identifier and products that legitimately have none
Questions
GTIN, MPN and Brand Checker questions, answered
The things merchants ask before they run their first scan.
That is a legitimate case. Products you manufacture should declare that no identifier exists rather than carry an invented one. The audit distinguishes a genuine own brand product from a branded product that simply lost its identifier.
Keep reading
Related checks
Disapproved Products
Group every disapproval by root cause and see which single fix clears the most items.
Product Data Quality Score
Score every product on completeness, specificity and uniqueness of its data.
Product Feed Audit
Compare what your feed sends against what your product pages actually show.
See where your store actually stands
Run a free scan and get a prioritised report of what to fix first, with the affected products named.
No credit card needed for the free scan.