DNI, NIE, CIF, IBAN and credit card validator
Check whether a Spanish ID document, bank account or card number has a valid format and check digit. It does not check whether it actually exists: it only verifies the algorithm.
Quick validator
Check whether a DNI, NIE, CIF, IBAN, card number, NSS or CCC has a valid format and check digit.
The validator checks format and check digits. It does not check whether the document or account exists. The value is never sent to any server or stored in the URL.