◇Free
GTIN barcode checksum
Check GTIN-8, UPC-A, EAN-13 or GTIN-14 check digits.
Check GTIN-8, UPC-A, EAN-13 or GTIN-14 check digits. Recompute the expected final digit using alternating weights of three and one from the right. Results show input length, validity and the expected check digit for comparison.
How to use
- Enter your text, values, or image.
- Adjust the options and run the tool.
- Copy or download your result.
Worked example
Example input
Input: 4006381333931
Example result
{
"length": 13,
"valid": true,
"expectedCheckDigit": 1
}Limitations and details
This checks numeric check digits only; it does not generate barcode images, identify products or verify GS1 assignment.
Inputs and options
- Input
- Text
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.