Generate numeric identifiers that satisfy the Luhn mod-10 checksum.
Choose the total length and an optional numeric prefix. The helper fills the remaining body digits, appends a valid check digit, and returns the complete number.
Generated values are useful for validation tests, UI demos, and checksum education. They are not real payment cards, accounts, or issued identifiers.
When to use it
Pair with the Luhn validator subtool to demonstrate generate-then-validate workflows in QA fixtures. Length and prefix fields let you mimic issuer-specific identifier shapes without touching production data.
Limitations
Results depend on the values you enter and standard browser math; they are not audited for regulatory compliance. Very large inputs, locale-specific rounding, or edge cases may differ from spreadsheet or server implementations.
Example
For example, enter the default sample values on the form and compare the output with a known reference; adjust one input at a time to see how the result changes.