Luhn Checker
Validates numbers against the Luhn checksum (mod 10) — used by card numbers, IMEIs, and various ID schemes — one at a time, as a check-digit generator, or across a whole file column.
Check a number
Generate check digit
Check a file column
Number to check
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About this tool
Validates numbers against the Luhn checksum — one at a time, as a check-digit generator, or across a whole file column.