GS1 Company Prefix Lookup

This GS1 prefix lookup tool reads a GTIN, EAN, or UPC, validates it, and tells you which GS1 office issued the number and where the GS1 Company Prefix sits inside it, so you can group products by the brand owner who licensed them. Paste a single code or a whole column, and it parses each one in your browser without ever sending the data anywhere.

GS1 Company Prefix Lookup

Runs in your browser · no upload

Paste one GTIN / EAN / UPC or a whole column

Company Prefix length Not known 6 digits7 digits8 digits9 digits10 digits11 digits12 digits Printed on your GS1 licence; the barcode itself doesn't encode it.

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Owner lookup: Verified by GS1 (GS1's official registry, opens gs1.org).

The GS1 Prefix shows which GS1 office licensed a number, not where the product was made. To see which company owns a prefix, use GS1's own registry, Verified by GS1. See how Claro groups and deduplicates products by identifier →

What it checks

For every barcode you enter, the tool extracts and reports:

• The GS1 Company Prefix — the leading digits licensed to a single brand owner or manufacturer. Enter the prefix length (it is printed on the GS1 licence) and the tool splits it out; otherwise it lists the candidate prefixes and, for a column, the leading digits all your codes share.
• The item reference — the remaining digits the brand owner assigns to a specific product.
• The check digit and whether it is mathematically valid for the full number.
• The GS1 Prefix range (usually the first three digits) that indicates the issuing member organization, for example GS1 US versus GS1 Germany, or a restricted-distribution range. It shows who issued the number, not the product’s country of origin.
• The identifier type it parsed (UPC-A, EAN-13, GTIN-12, GTIN-13, or GTIN-14) after normalizing length.
• A flag for restricted or internal-use prefixes (such as in-store coupon or variable-weight ranges) that are not globally unique brand prefixes.

How the GS1 prefix lookup works

A GTIN is not a random string. GS1 issues each brand owner a Company Prefix, and that prefix forms the leading portion of every GTIN the company creates. The brand owner appends an item reference of its own choosing, then a single check digit computed with the standard modulo-10 algorithm (alternating weights of 3 and 1 across the other digits). Because the prefix sits at the front, you can read it directly off the barcode; only its length, and the company that holds it, live in GS1’s own records.

The tool runs three steps on each input:

1. 1
   Normalize

   Strip spaces and hyphens, then right-align the digits into a 14-digit GTIN frame so a 12-digit UPC and a 13-digit EAN can be compared on the same basis.

2. 2
   Validate

   Recompute the check digit and confirm it matches, so a transposed or mistyped barcode is caught before you trust the prefix.

3. 3
   Split

   Identify the GS1 Prefix range and the office that issued it, then separate the Company Prefix from the item reference (using the prefix length, when you know it) and surface both.

All of this happens client-side in your browser. Nothing is uploaded, so you can run a price file from a furniture supplier, an MRO parts list, or a CPG promotion feed without moving sensitive data off your machine.

Reading the prefix is useful well beyond the barcode itself. A distributor reconciling fifty supplier feeds can group thousands of SKUs by brand owner even when product names are inconsistent. An industrial reseller can spot when two “different” line items share a Company Prefix and item reference, a strong signal they are the same physical product. A marketplace can catch sellers who reuse a single prefix across unrelated listings. The prefix is a durable anchor for identity resolution — exactly the kind of signal Claro’s product-data layer uses to match and deduplicate catalogs at scale.

Related resources

FAQ

How do I find the GS1 Company Prefix in a barcode? +

The Company Prefix is the leading block of digits in a GTIN, EAN, or UPC, sitting after the GS1 Prefix range and before the item reference. Because it is encoded at the front of the number, you can read it directly — paste the barcode into the lookup above, set the prefix length if you know it, and it splits the prefix from the item reference for you.

How long is a GS1 Company Prefix? +

There is no single fixed length. GS1 issues prefixes of varying length depending on how many items a company expects to identify — typically somewhere between seven and ten digits within a 13-digit EAN. A larger brand owner often holds a shorter prefix with more room for items. The length is not encoded in the number, so the tool lists the candidate splits unless you enter the length from the GS1 licence.

Can I identify the manufacturer from the GS1 prefix? +

The prefix tells you which licensed range a number belongs to and the issuing GS1 member organization (for example a US/Canada versus European range). Mapping a prefix to a specific company name requires GS1’s own licensing records, which this tool does not query. It identifies the prefix; to look up the company behind it, use GS1’s Verified by GS1 service.

Is a UPC prefix the same as a GS1 Company Prefix? +

A UPC-A is a 12-digit GTIN, so its Company Prefix is part of the same GS1 system as an EAN-13 — just padded to a common length when normalized to a 14-digit GTIN. The single leading “system” digit you see on a US UPC is part of the GS1 Prefix range, not a separate scheme.

Does this tool send my barcodes to a server? +

No. The GS1 prefix lookup runs entirely in your browser. There is no upload, no login, and no file-size limit, so you can paste an entire catalog column and nothing leaves your machine.