Luhn Credit Card Validator

Validate a card number with the Luhn mod-10 checksum, detect the card network from the IIN/BIN prefix, and group the digits for display — or compute the Luhn check digit for a given number body. Runs entirely in your browser; your card number never leaves your device.

Mode

Card number

Result

Spaces and dashes are ignored. Luhn doubles every second digit from the right, sums the digits (splitting values over 9), and the total mod 10 must be 0.

🔒 Everything stays in your browser — nothing is uploaded.