GTIN / UPC / EAN Validator
Free online GTIN validator. 100% client-side, bilingual EN/TH.
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What is GTIN / UPC / EAN Validator?
The GTIN Validator checks Global Trade Item Numbers - the digits inside UPC, EAN, and ITF-14 barcodes - using the official GS1 mod-10 checksum. It accepts 8, 12, 13, and 14 digit codes, auto-detects the format, decodes the GTIN-14 packaging indicator, and maps the GS1 prefix to its issuing member organisation. All validation happens locally in your browser.
Key Benefits
- Instantly catch mistyped or corrupted barcode numbers before they reach catalogs, EDI systems, or marketplaces
- Understand GTIN-14 case codes by decoding the packaging indicator digit
- Sanity-check supplier codes by looking up the GS1 prefix region
- Works fully offline with complete privacy for confidential product data
Common Use Cases
- •E-commerce teams validating product feeds for Amazon, Google Shopping, Lazada, and Shopee
- •Warehouse and logistics staff distinguishing base units from case cartons
- •Data-entry QA verifying hand-typed barcode numbers before saving
- •Developers testing barcode-related checkout or inventory logic
How to Use the GTIN Validator
- Enter the barcode number: Type or paste the 8, 12, 13, or 14 digit number. Spaces, hyphens, and dots are stripped automatically.
- Read the verdict: A green panel confirms a valid GTIN and names the format (UPC-A, EAN-13, ITF-14); a red panel flags a bad length or checksum mismatch and shows the expected check digit.
- Check the decoded details: For valid codes the tool shows the zero-padded GTIN-14, the packaging indicator meaning for GTIN-14 case codes, and the GS1 prefix region.
- Copy the result: Use the copy buttons to grab the normalized code or the GTIN-14 form for spreadsheets, EDI files, or marketplace feeds.
Key Features
- Validate GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13), and GTIN-14 with the official GS1 mod-10 check digit algorithm.
- Automatic format detection that names the matching barcode symbology: EAN-8, UPC-A, EAN-13, or ITF-14.
- GTIN-14 packaging indicator decoding to distinguish base units, inner packs, and case cartons.
- GS1 prefix lookup that identifies the issuing member organisation, including ISBN, ISSN, and coupon prefixes.
- One-click copy for the normalized GTIN and its zero-padded GTIN-14 form.
Frequently Asked Questions
What is the difference between GTIN, UPC, and EAN?
They are the same numbering system at different lengths. UPC-A is 12 digits (GTIN-12, used mainly in North America), EAN-13 is 13 digits (GTIN-13, used internationally), EAN-8 is 8 digits, and ITF-14 case codes are 14 digits (GTIN-14). A UPC-A can be converted to GTIN-13 by prefixing a 0.
How is the GS1 check digit calculated?
Starting from the rightmost digit of the payload, multiply digits alternately by 3 and 1, sum the products, and pick the digit that brings the total to the next multiple of 10. This mod-10 scheme is identical for GTIN-8, -12, -13, and -14.
What does the first digit of a GTIN-14 mean?
It is the packaging indicator. 0 means a base unit (each), 1 through 8 identify increasingly larger packaging configurations such as inner packs and case cartons, and 9 marks variable-measure items sold by weight or quantity.
Can this tool tell me which country a product is from?
Not exactly. The GS1 prefix shows which national GS1 member organisation issued the company prefix, not where the product was made. For example, 885 means GS1 Thailand, but a Thai-registered company could manufacture anywhere.
Does a valid checksum mean the product really exists?
No. A passing checksum only proves the number is structurally valid, not that it is registered or in use. For registration status you need the official GS1 GEPIR or Verified by GS1 services.