EAN (International Article Number, originally European Article Number) and UPC (Universal Product Code) are the two dominant retail barcode standards. They share the same visual format — vertical bars of varying width — and are functionally interchangeable at modern point-of-sale systems. But their history, structure, and regional adoption differ significantly.
| Feature | UPC-A | EAN-13 |
|---|---|---|
| Digits | 12 | 13 |
| Introduced | 1973 (IBM) | 1976 (Europe) |
| Primary Region | USA & Canada | Rest of the world |
| Country Prefix | No (always US) | Yes (2-3 digit prefix) |
| Check Digit | Last digit | Last digit |
| Can Be Converted? | Yes → EAN (add leading 0) | Yes → UPC (drop leading 0) |
| Variant for Small Items | UPC-E (6 digits) | EAN-8 |
A UPC-A barcode encodes 12 digits. The first 6 digits are the manufacturer identification number, assigned by GS1 US (formerly the Uniform Code Council). The next 5 digits are the product number, assigned by the manufacturer. The final digit is a check digit, calculated from the previous 11 digits using the modulo-10 algorithm. For example, a box of cereal might have the UPC 036000291452 — the first 6 digits identify the manufacturer, the next 5 identify the specific product, and the final 2 is the check digit.
An EAN-13 barcode encodes 13 digits. The first 2-3 digits identify the country of the GS1 member organization that issued the manufacturer prefix — not necessarily the country where the product was made. For example, prefixes 00-13 indicate the US/Canada, 40-44 indicate Germany, 45 and 49 indicate Japan, 50 indicates the UK, and 869 indicates Turkey. The manufacturer code follows (typically 4-6 digits), then the product code, and finally the check digit. The full EAN-13 encodes the same information as UPC-A plus an additional country-of-origin digit at the front.
Critically, the two formats are mathematically compatible. Adding a leading zero to a 12-digit UPC (036000291452) produces a valid 13-digit EAN (0036000291452). Conversely, dropping the leading zero from a US-registered EAN-13 produces the equivalent UPC-A. Since a 2005 global compatibility initiative, every UPC scanner can read EAN-13 codes, and vice versa.
The division is largely historical. UPC-A is dominant in the United States and Canada. If you walk into a Walmart, Target, Costco, or any major retailer in North America, nearly every product on the shelf carries a UPC-A barcode. The format was developed by IBM specifically for the US grocery industry in 1973, and it achieved critical mass before international standards could take hold.
EAN-13 is used everywhere else. Europe, Asia, Africa, South America, Australia, and the Middle East all use EAN-13 as their primary retail barcode. Even the UK, which shares much of its commercial infrastructure with the US, uses EAN-13. Japan's EAN prefixes (45 and 49) are among the most heavily assigned in the world.
In practice, modern point-of-sale systems in all countries read both formats without issue. If you are selling a product in North America, a UPC-A is traditional but an EAN-13 will scan correctly. If you are selling anywhere else, use EAN-13. If you plan to sell both domestically in the US and internationally, an EAN-13 with a US prefix (00-13) will work everywhere.
This is the question that trips up most new sellers. The answer depends entirely on who is scanning the barcode.
For internal use only — tracking inventory in your own warehouse, labeling products for your own store, managing assets in your office — you do not need an official GS1-issued prefix. You can generate a valid CODE128 or EAN-13 number using a free barcode generator and print it. Nobody outside your organization will ever scan it, so there is no need for a globally unique registered number. This is the correct approach for private labels, single-store bakeries, internal event ticketing, library book tracking, and any closed-loop barcode system.
For products sold through retail chains, online marketplaces, or distributors — Walmart, Amazon (FBA), Tesco, Carrefour, or any retailer that integrates your barcode into a shared point-of-sale or inventory system — you generally need a GS1-issued GTIN. Each retailer has its own policy, but the principle is universal: if your barcode number collides with another product in the supply chain, inventory tracking breaks. GS1 prefixes prevent collisions by assigning every manufacturer a globally unique identifier. You purchase a prefix from your national GS1 member organization (GS1 US, GS1 UK, GS1 Turkey, etc.) and pay an annual license fee based on the number of unique products you need to identify.
The distinction is straightforward: if only you scan it, any valid barcode works. If anyone else scans it, get an official GS1 GTIN.
A barcode that looks correct on screen but fails at the checkout scanner is a common and expensive mistake. Follow these rules to ensure your barcodes scan reliably:
Size: For EAN-13 retail use, the nominal width is 37.29 mm with a height of 25.93 mm (including the human-readable numbers). The minimum acceptable magnification is 80% of nominal (29.83 mm wide). Never go below 90% for retail products. For internal use with CODE128 on shipping labels, standard widths range from 50-80 mm.
Quiet Zone: Every barcode needs a blank margin — the quiet zone — before the first bar and after the last. For EAN and UPC codes, this margin should be at least 10 times the width of the narrowest bar, typically 2-3 mm. Crowding text or design elements into this zone will cause scan failures.
Contrast: Print in pure black on a white or very light, matte background. Dark bars on a light background are mandatory for laser scanners. Avoid glossy paper, dark-colored labels, and transparent packaging that shows through to the product behind the barcode.
Never resize a barcode by stretching or squashing it. Changing the width of a barcode — even slightly — alters the ratio of bar width to space width that the scanner is calibrated to read. Always generate the barcode at the correct size from the source using a vector format (SVG) from a tool like our barcode generator, and scale proportionally if needed. A PNG resized in design software will almost certainly fail to scan.
Create EAN-13, UPC-A, CODE128, and more — instantly, free, and directly in your browser. Download as SVG for print-ready quality.
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