UPC Barcode Check Digit Calculator

Original 11/12 Digits Data

Please input the barcode data to be calculated (corrected)
Generally 11~12 digits
One line for one barcode data, pay attention to line feeds

Corrected 12 Digits Data

Corrected data will be displayed here.
Invalid formats will be skipped with a prompt.

Instructions for Use

UPC-A Barcode Structure Guide

The UPC-A(also known as GTIN-12) barcode consists of 12 digits, with the last digit being a check digit calculated from the first 11 digits.

When generating barcodes on our site, simply enter the first 11 digits. We will automatically calculate and add the check digit to complete the 12-digit barcode.

This tool can help you calculate or correct check digits and supports batch processing.