GTIN / EAN / UPC Validator
Free GTIN validator: paste or upload GTIN-8, UPC-A, EAN-13, or GTIN-14 codes to verify length, check digit, and format. Runs in your browser.
This GTIN validator checks whether a product identifier is structurally valid before you trust it in a catalog. Paste one barcode or thousands — GTIN-8, UPC-A, EAN-13, and GTIN-14 are all confirmed against their length, format, and GS1 check-digit rules in a single pass.
GTIN / EAN / UPC Validator
The interactive version of this tool is coming soon. It will run entirely in your browser — no login, no upload limits.
Planned tool: gtin validator
Need this now? Talk to ClaroWhat it checks
For each code you submit, the validator reports:
- Length and format — confirms the value contains only digits and matches a known GTIN length: 8 (GTIN-8), 12 (UPC-A), 13 (EAN-13), or 14 (GTIN-14 / ITF-14 case codes).
- Check digit — recomputes the final modulo-10 digit using the GS1 algorithm and flags any mismatch, the single most common cause of a “valid-looking” barcode that scanners reject.
- Detected type — labels each input as GTIN-8, UPC-A, EAN-13, or GTIN-14 so you can spot mixed formats in one column.
- Normalized GTIN-14 — shows the zero-padded 14-digit form GS1 recommends for storage, so a UPC-A from a CPG supplier and an EAN-13 from a furniture vendor reconcile to the same key.
- Common defects — surfaces leading/trailing whitespace, embedded hyphens or spaces, Excel scientific-notation corruption (for example
5.06005E+12), and values that are all zeros or placeholder strings. - Batch summary — for pasted or uploaded lists, a pass/fail count plus the row numbers that failed, so an MRO or industrial-distribution team can fix a feed before import.
How the GTIN validator works
Every GTIN ends in a check digit derived from the preceding digits. Reading from the right, each digit is multiplied alternately by 3 and 1, the products are summed, and the check digit is whatever value brings that sum up to the next multiple of 10. EAN-13, UPC-A, GTIN-8, and GTIN-14 all share this modulo-10 scheme; only the length and weighting alignment differ. The validator recomputes that digit and compares it to the one supplied.
It also normalizes lengths. A 12-digit UPC-A and a 13-digit EAN-13 are the same GTIN expressed at different widths — padding both to 14 digits is what lets a deduplication or catalog-matching step treat them as one identifier instead of two.
- 1Paste or uploadDrop in a single GTIN or a full column of identifiers from a supplier price list, ERP export, or marketplace feed.
- 2Validate in the browserLength, format, and check digit are computed locally — instantly, with no row limit.
- 3Review and exportRead the pass/fail breakdown and copy the cleaned, GTIN-14-normalized results back into your file.
Related resources
Glossary
GTIN vs EAN vs UPC
How the formats relate, and why GTIN-14 is the safe storage standard.
Glossary
SKU vs MPN vs GTIN
Which identifier means what, and which one to match on.
Tool
GTIN Check Digit Calculator
Compute or repair the trailing check digit for any GTIN length.
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GS1 Company Prefix Lookup
Trace a GTIN back to its issuing GS1 prefix range.
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GLN Validator
Validate the location identifiers that travel alongside GTINs in GDSN.
Claro
Automated product enrichment
Validate, normalize, and enrich GTINs across millions of records with provenance.
FAQ
What is a valid GTIN length?
A valid GTIN is 8, 12, 13, or 14 digits — GTIN-8, UPC-A (12), EAN-13 (13), or GTIN-14 (14). Anything else is not a GTIN. If your data has 11-digit values, you are likely missing a leading zero that was stripped by a spreadsheet.
How do I check a GTIN check digit?
Take the digits before the last one, multiply them by alternating weights of 3 and 1 from right to left, sum the results, and the check digit is the amount needed to reach the next multiple of 10. The validator does this for you and flags any mismatch.
Is a 13-digit EAN the same as a UPC?
Almost. A 12-digit UPC-A is an EAN-13 with a leading zero. Both are the same underlying GTIN, which is why normalizing everything to GTIN-14 prevents the same product from appearing twice in your catalog.
Why does my GTIN fail validation after exporting from Excel?
Spreadsheets often convert long numeric strings to scientific notation (like 5.06005E+12) or drop leading zeros. The validator detects these patterns. Store GTINs as text, not numbers, to avoid silent corruption.
Does a valid check digit mean the GTIN is real?
No. A passing check digit only proves the code is structurally correct. It does not confirm the GTIN was assigned to a brand or matches a specific product. Pair this check with a GS1 prefix lookup and a trusted catalog source to confirm authenticity.