Validate a credit card number with the Luhn algorithm and detect the card brand online, in your browser.
Check whether a card number passes the Luhn checksum and detect its brand (Visa, Mastercard, Amex, Discover and more). Validation is structural only — it never contacts a bank or stores the number.
No. It only verifies the number's format and Luhn checksum and guesses the brand. It cannot tell you if a card is active or has funds.
A simple checksum that catches most typos in card, IMEI and similar numbers. Passing it means the digits are internally consistent, not that the card exists.