I Built an EAN-13 Barcode Checker (With Checksum Validation)

While working with product data, I needed a way to validate EAN-13 barcodes.

So I created this tool:
👉 https://netalith.com/tools/ean-check

What is EAN-13?

EAN-13 is a 13-digit barcode used globally in retail and eCommerce.

But here's the catch:
👉 Not all 13-digit numbers are valid.

The Checksum Logic

EAN-13 uses a checksum to verify validity:

Multiply digits in even positions by 3
Add all digits together
Take modulo 10
Calculate check digit
Example (JavaScript)
function isValidEAN(ean) {
const digits = ean.split('').map(Number);
const checksum = digits
.slice(0, 12)
.reduce((sum, num, i) => {
return sum + num * (i % 2 === 0 ? 1 : 3);
}, 0);

const checkDigit = (10 - (checksum % 10)) % 10;
return checkDigit === digits[12];
}
What My Tool Does
Validates EAN-13 format
Calculates checksum
Detects invalid codes
Who Needs This?
eCommerce devs
Inventory systems
Data engineers
Try It Out

👉 https://netalith.com/tools/ean-check

Let me know if you want API support or batch validation 👇