Check and Validate
Free validators for CNP, DNI/NIE, and IBAN. No sign-up needed.
Three focused tools for checking identity and bank numbers: the Romanian personal numeric code (CNP), the Spanish national ID (DNI and NIE), and the International Bank Account Number (IBAN). Each one runs entirely on this page, uses the official algorithm, and explains what it found. There is nothing to install and no account to create.
Validators
CNP Validator
Check the structure and control digit of a Romanian CNP, and read back the birth date, sex, and county it encodes.
DNI/NIE Calculator
Work out the check letter for a Spanish DNI or NIE, or confirm whether the letter on an existing document is correct.
IBAN Validator
Validate an IBAN with the mod-97 checksum and the official per-country length, and see exactly which check failed.
This site is available in English, Romanian, and Spanish. Use the language links in the header to switch, and you will land on the same tool in the language you choose.