IBAN & Card Check
IBAN mod-97 and card Luhn validation, with country and brand detection.
A free IBAN and bank card validator: IBANs are checked with ISO 7064 mod-97 and broken down into country code, check digits and account part; card numbers are checked with Luhn and matched to a brand — Visa, Mastercard, UnionPay, JCB, American Express and more. Everything is computed locally: no network, nothing written to browser storage, nothing in the URL.
How to use
- Pick what you are checking: IBAN or card number.
- Paste the number — spaces and dashes are ignored.
- Read the verdict; when it passes you can copy the grouped format for printing or manual checking.
FAQ
- Does passing mean the account really exists?
- No. mod-97 and Luhn are checksum algorithms designed to catch typos — they detect a missing or mistyped digit, but they cannot prove the account exists at any bank, let alone that it holds funds. Confirming an account requires the bank.
- Is my card number uploaded anywhere?
- No. This page makes no network requests; the number exists only in this tab’s memory. We deliberately do not write it to localStorage or put it in the URL. Close the tab and it is gone.
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