Barcode Check Digit Calculator
Calculate or verify the GS1 check digit for GTIN-8, UPC-A, EAN-13, GTIN-14, and SSCC-18 codes.
How is a GS1 check digit calculated?
Starting at the rightmost body digit, multiply alternating digits by three and one. The check digit is the amount needed to bring the total up to the next multiple of ten.
Your result
A little clarity, right here.
Start with your own content or load the example. Your result will appear here.
Three simple steps
How to use Barcode Check Digit Calculator
Paste your content or choose a supported file.
Adjust the options, then run the tool.
Review the result and copy or download it.
Common questions
Good to know
Understand the result.
Keep the original.
Is this tool free, and are my files uploaded?
This tool is free with no account required. The work happens in your browser. Your input and files are not sent to a processing server.
What are the limits and details?
A valid check digit does not prove that a barcode is registered, assigned, or authentic. Only supported numeric code lengths are accepted.
Limits: 500,000 characters per text field; files up to 20 MB each, 10 files and 50 MB total. Processing stops after 30 seconds.