Luhn Check (Credit Card Validator)
Validate any number with the Luhn algorithm and detect common card brands by IIN range.
🔒 Numbers are checked locally. We don't store, log, or transmit them.
The Luhn algorithm
Patented in 1960 by IBM's Hans Peter Luhn, the Luhn algorithm (a.k.a. modulo 10 check) is the simple checksum baked into credit cards, IMEI numbers, US national-provider IDs, Canadian SINs, and a long list of other identifiers.
It only catches single-digit typos and most transpositions. It's a not-a-typocheck, not a fraud check — don't treat a valid Luhn as proof the number belongs to anyone.
Privacy:this tool runs locally. Numbers you type never leave the browser. Still, don't paste real card numbers into random web tools as a habit.
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