Barcode Validator
Check whether a product barcode number has a valid check digit. Supports EAN-13, EAN-8, UPC-A and ITF-14.
How it works
- 1
Type the barcode digits
8, 12, 13 or 14 digits.
- 2
See if it is valid
The GS1 check digit is verified.
- 3
Read the format
EAN-8, UPC-A, EAN-13 or ITF-14.
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Frequently asked questions
UPC-A has 12 digits and is common in North America; EAN-13 has 13 and is used worldwide.
How barcode check digits work
Retail barcodes follow the GS1 standard, where the last digit is calculated from the others using alternating weights of 3 and 1. If a digit is mistyped, the check digit no longer matches, which is how scanners and stock systems catch errors.
A valid result means the number is well-formed. It does not tell you which product the code belongs to.