Send us a question, report a bug or suggest a check digit standard. We welcome feedback from people who work with retail, shipping, inventory, software or mathematics. Use the contact details below.
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Direct Communication
For technical inquiries, feature suggestions, or institutional support requests, drop us an email anytime.
Email Address:support@checkdigitcalculator.com
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Response Time
We review community submissions and error reports within 24 to 48 business hours.
Operating Location: Remote / Global Engine
Send Us a Direct Note
Fill in the fields below to submit feedback or report an algorithm discrepancy.
Frequently Covered Topics
Before reaching out, check whether your question is answered on our homepage FAQ section, which addresses differences between EAN and UPC barcodes, licensing requirements with GS1, and client-side computational architecture.