Data & Documents
GTIN / Barcode Check Digit
Validate or calculate the check digit for supported GTIN-8, GTIN-12, GTIN-13 and GTIN-14 barcode numbers.
Note: Enter the data digits without the check digit. This calculates a mathematically valid check digit; it does not verify that a product code is issued or registered by GS1.
Formula
Alternate 3/1 weights; check = (10 − sum mod 10) mod 10.
FAQs
Purpose?
Detects errors.