How to Check If an EAN Number Is Valid (Free EAN Checker Guide)

If you've been handed an EAN number by a supplier, manufacturer, or marketplace listing and want to confirm it's real before you use it, here's what "valid" actually means and how to check it.

What Makes an EAN Number "Valid"

An EAN-13 number is valid in two separate senses: structurally valid, meaning its final digit is a correct checksum calculated from the other 12 digits, and registrationally valid, meaning the prefix portion of the number is actually assigned to a real GS1 member. A number can pass the first check and still fail the second.

How to Check the Structural Checksum

• Most free EAN checker tools online will instantly tell you whether the check digit is mathematically correct for the rest of the number.
• This confirms the number is well-formed, but it does not confirm the number was ever officially issued to anyone.

How to Check Real Registration

Registrational validity is the part that actually matters for selling. A number that's structurally correct but was never issued through GS1 can still get rejected by marketplaces that verify against the official database. The only reliable way to be certain is to obtain the EAN from a GS1-certified source in the first place, rather than checking a number you received from an unverified party after the fact.

Common EAN Number Problems Sellers Run Into

• Leading zero confusion: a 13-digit EAN with a leading zero is often the same number as a 12-digit UPC — dropping or adding that zero incorrectly can make a valid number look invalid.
• Reused numbers: a supplier reusing the same EAN across different product variants, which causes marketplace catalog conflicts.
• Copy-paste errors: transposed or dropped digits when a number is typed in manually instead of scanned.

Frequently Asked Questions

What's the difference between checking and verifying an EAN?

Checking usually refers to the checksum math (is the number well-formed); verifying means confirming it's actually GS1-registered, which requires checking against the official database, not just the math.

Can an EAN number with a correct checksum still be fake?

Yes. Checksum validity only proves the number is well-formed, not that it was ever issued to a real business.

Is an EAN-13 the same as a UPC with a zero in front?

Often, yes — many UPC-A codes can be represented as EAN-13 by adding a leading zero, since both systems share a common numbering structure.

Where should I buy an EAN to avoid validity issues entirely?

From a GS1-certified source that issues real, traceable numbers, rather than sourcing one from an unverified supplier or generator.

Ready to get your barcode? Buy GS1-certified barcodes here →