GTIN Validator
Validate your barcode numbers and calculate the correct check digit for EAN-13, UPC-A, and ITF-14 formats.
GTIN validator and checkdigit calculator
Our comprehensive GTIN validator supports all major Global Trade Item Number formats including GTIN-8, GTIN-12, GTIN-13, and GTIN-14.
This powerful tool not only validates your barcode numbers but also calculates the correct check digit when needed. It automatically identifies and verifies various barcode standards including ISBN, ISSN, UPC, EAN, and ITF codes. Whether you're a retailer, manufacturer, or logistics professional, this tool ensures your product identification numbers are correct.
| GTIN Type | Digits to Enter | Total Length |
|---|---|---|
| UPC-A | 11 | 12 |
| EAN-13 | 12 | 13 |
| ITF-14 | 13 | 14 |
How the GTIN Check Digit Works
The last digit of a GTIN (Global Trade Item Number) is a calculated check digit. It is used to ensure that the barcode has been scanned or typed correctly. If the check digit does not match the result of the mathematical algorithm, the scanner will reject the barcode.
The Modulo-10 Algorithm
The calculation involves multiplying each digit by a weight (alternating 3 and 1), summing the products, and finding the value needed to reach the next multiple of 10.
Looking for a Registered GTIN?
Our barcodes come with pre-calculated check digits and are globally unique.