#1 Free GTIN Checker and GS1 Prefix Lookup
Clear answers for catalog, ops, and engineering teams using barcode validation, GTIN checks, and GS1 prefix lookup for product barcodes.
This barcode checker supports online barcode validation for EAN-8, UPC-E, UPC-A, EAN-13, and GTIN-14 codes. Enter digits only using 8, 12, 13, or 14 numbers. For 8-digit barcodes, the tool can identify EAN-8, UPC-E, or an EAN-8 / UPC-E overlap when the code is valid in both formats.
This barcode validator determines validity by checking that the code uses a supported GTIN length and recomputing the check digit from the preceding numbers using standard GTIN weighting rules. It then compares the calculated digit with the final digit in your barcode to confirm whether the barcode number is valid.
This tool uses the GS1 check-digit algorithm for EAN-8, UPC-A, EAN-13, and GTIN-14. For UPC-E, it validates the code by expanding the zero-suppressed value to its GTIN-12 or UPC-A form and then applying the same GS1 check-digit rules. The official sources below explain the check-digit method, the EAN or UPC barcode family, and the UPC-E relationship to zero-suppressed GTIN-12 values.
A correct check digit only confirms that the barcode math is consistent. This barcode checker still marks a code as invalid when the input is not digits-only, does not use a supported length, or does not pass format validation for EAN-8, UPC-E, UPC-A, EAN-13, or GTIN-14. If a code passes here but is rejected elsewhere, that is usually due to catalog, marketplace, or seller requirements outside this validator.
The GS1 prefix identifies the GS1 member organization associated with the company prefix range for the barcode number. In this GS1 prefix lookup tool, that helps you understand issuing jurisdiction and barcode prefix context, but it does not confirm the exact brand owner, seller, or country of manufacture.
No. GS1 prefix data and barcode validation can help you review a barcode number, but they do not prove legal product ownership, trademark rights, or marketplace listing authorization. Use official GS1 records, supplier documentation, and marketplace compliance checks for barcode ownership verification.
No. Checking a UPC, EAN or GTIN confirms the barcode’s supported format and check digit, not product authenticity. Counterfeit products can copy genuine barcode numbers. A valid result does not confirm GS1 registration, and an invalid result alone does not mean a product is fake. Compare official product and company records with the item and packaging, check the seller, and follow the brand’s own verification process.
Follow the product authenticity checklistNo. A barcode does not tell you the manufacturing origin of a product. The GS1 prefix may identify the GS1 member organization that licensed the company prefix range, but that territory does not necessarily match the country where the product was made. Use packaging details, manufacturer information, and official product records when you need country-of-origin verification.
Normally, no. A UPC, EAN, or other GTIN should identify one specific trade item configuration. Different variants such as size, flavor, color, pack count, or packaging configuration usually need different barcode numbers when they must be distinguished in ordering, inventory, or checkout. Multiple physical copies of the same product can use the same code, and the same GTIN can be used for the same product across sales channels or countries. If unrelated products share one code, that usually points to non-standard assignment, copied marketplace data, or counterfeit labeling.
No. Barcode validation runs in your browser session, and this tool does not require persistent server-side storage of the barcode numbers you check. That makes it useful for private barcode verification workflows where you want a fast online barcode checker without account-based data retention.
No. Barcode format validation and check-digit calculation run directly in the page, and the GS1 prefix lookup uses bundled reference data included with the app. This barcode validator does not send your validation requests to third-party APIs for the core barcode checking flow.
A barcode check is a useful first step, but it cannot prove that a product is authentic. Use the number to check its format and look up product details, then compare the physical item, seller and brand security features.
Valid barcode
The format and check digit pass. This does not confirm GS1 registration or authenticate the item. A counterfeit can copy the same number.
Invalid barcode
Recheck every digit and the supported format. A mistyped number or damaged label is possible; an invalid result alone does not mean fake.
No product found
This checker does not search a product database. If a separate lookup finds nothing, ask the brand or supplier to verify the number.
Enter the digits beneath the bars, including any leading zeros. For a 13-digit barcode, check the full EAN-13. A camera scan reads the number; it does not authenticate the product.
Check your barcode for freeUse Verified by GS1 to look up the company licensed to use the GTIN and any available product details. The company may be a brand owner, importer or retailer rather than the factory.
Look up the number with Verified by GS1Compare the brand, model, size, colour and pack size with the item and packaging. A matching record identifies the product type; it does not prove that this particular item is genuine.
Prefer the brand or an authorised retailer. Keep your receipt and photos of the product, packaging and labels. An unusually low price or inconsistent packaging calls for closer checks.
Open the brand’s official website independently and follow its instructions for security labels, serial numbers or authentication services, where available. Ask the brand or retailer about mismatched details.
Yes. A UPC or EAN normally identifies a product type, so many genuine units share it. A counterfeit label can copy it too. A successful scan, a correct check digit or a matching product photo cannot distinguish those physical items.
Validate the UPC or EAN, then compare the shoe model, size and colour with the box label and available official product information. Style or article numbers are separate identifiers. A barcode match is one consistency check, not a guarantee that the shoes are original.
No. The retail barcode identifies the product type; a separate batch or lot code refers to a production group. Ask the brand about batch details and compare the bottle, box, seals and seller. A plausible batch code or production date also does not prove authenticity.
No. QR codes can be copied and can lead to convincing fake verification pages. Check the website address against the brand’s official site. Use a brand’s item-specific verification process where available, rather than trusting a scan alone.
No. The GS1 prefix relates to the organisation that allocated the number, not the factory location. Check the product’s origin label and manufacturer information. A different prefix country is not, by itself, evidence of a fake.
Practical ways to do a UPC lookup, find product and nutrition data, compare UPC databases, and reduce API lookup costs.
If you need a UPC lookup for inventory, competitor research, price comparison, or marketplace operations, use the source that matches the depth and speed of data you need.
Official manufacturer lookup: Use Verified by GS1 when you need the company that licensed the barcode. It is the strongest official source for brand-owner identification, but it is not a full product catalog with rich metadata.
Third-party UPC databases: Lookup sites such as Barcode Lookup, Go-UPC, UPC Index, Buycott, and EAN-Search can help with single searches, product names, categories, and sometimes images. Coverage, freshness, and accuracy vary by source.
Google search: For one-off checks, search the UPC directly in Google. Add a site filter such as site:ebay.com or site:walmart.com when you want retailer-specific results.
UPC lookup APIs: APIs like UPCItemDB and UPCDatabase make sense for Excel, Google Sheets, internal tools, and real-time apps. Test match rate, field completeness, latency, and quota rules before choosing a paid plan.
Retailer APIs and scraping: Retailer APIs such as eBay Browse and Walmart Item Search can work well for products sold on those marketplaces. Web scraping can also surface product data, but you should review terms of service, reliability, and blocking risk first.
Food barcode lookups often need ingredients, calories, allergens, and serving data rather than just brand and product title.
USDA FoodData Central: FoodData Central is the best official starting point for many nutrition apps and food data workflows. The USDA publishes an API specifically for application developers who need nutrient data in software or websites.
Open Food Facts: Open Food Facts is an open, community-maintained food database with barcode search, API access, and bulk data options. It is useful when you want broad coverage and are comfortable validating crowdsourced records.
Commercial UPC APIs: Some commercial UPC APIs such as Go-UPC API also expose ingredients or nutrition fields, but coverage, licensing, and freshness vary, so test them against real products before relying on them.
These tools solve different problems, and many teams need both.
Barcode checker: A barcode checker validates syntax, length, and check digit, and may also show GS1 prefix context. It tells you whether the number is structurally valid.
Barcode database: A barcode database maps the UPC to product data such as title, brand, manufacturer, category, images, descriptions, ingredients, or nutrition facts.
Best workflow: Validate the code first, then send valid UPCs to a database or API. That reduces wasted lookups and improves data quality in downstream systems.
The right UPC database depends less on marketing claims and more on how well it performs on your own barcode set.
Match rate: Test whether the database can find products for the UPCs you actually search. Coverage can vary by category, brand mix, and region.
Accuracy: A high match rate is not enough if titles, brands, or images are wrong. Validate results against products you can inspect yourself.
Completeness: Some sources return only a product name, while others add descriptions, images, brand owner data, ingredients, or nutrition fields. Choose the level of detail your workflow requires.
Features: Check output format, API quality, bulk lookup support, latency, quota handling, and whether the provider supports your integration path.
Cost: Compare monthly pricing against usable request volume, including how free tiers can be leveraged and whether no-match responses count against the quota. Cost per successful match is often the more useful metric.
UPC database lookups can become expensive quickly when you process invalid, duplicate, or low-priority barcodes.
Prevalidate UPCs: Run a check-digit and format validation step before calling an external database. Filtering bad codes first reduces wasted paid requests.
Combine free tiers carefully: Multiple APIs can extend your daily free capacity, but only if you track per-provider quotas and keep response quality consistent.
Cache stable results: Product data usually changes slowly, so caching repeated lookups can cut API spend substantially. This works best when the same UPCs are searched often.
Use batch or deferred lookups: If the data is not needed in real time, spread requests across free or lower-cost quotas over hours or days instead of buying more throughput immediately.
Use trials and scraping cautiously: Trial plans can be enough for one-off jobs. Scraping may look cheap, but it can violate terms of service and create maintenance or blocking costs that outweigh API fees.