What is Luhn algorithm?

The Luhn algorithm is a checksum formula that validates identification numbers such as payment card numbers. It catches single-digit typos and most transpositions, and provides no security.

2 tools that work with Luhn algorithm

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Developer Tools1

Format ValidatorValidate emails, UUIDs, IP addresses, credit card numbers, IBANs and semver strings.

Samples & Mock Data1

Test Credit Card Number GeneratorGenerate Luhn-valid test card numbers for seven brands. Structurally correct, deliberately non-functional.

Related terms

Terms that appear alongside Luhn algorithm on the same tools.

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