IBAN Validator — Check 80+ Countries

IBAN Validator — Check International Bank Account Numbers

IBAN (International Bank Account Number) is a standardized format for identifying bank accounts internationally. It consists of a country code, check digits, and a bank account number. The check digits use the MOD-97 algorithm (ISO 7064) to detect transcription errors. This validator checks the format, length, and check digits for over 80 countries.

Enter or paste an IBAN to validate its structure instantly. The tool checks the country code, verifies the length matches the country's IBAN specification, and runs the MOD-97 checksum. For valid IBANs, it identifies the country and bank code so you can confirm the details match your expectations.

IBAN validation catches the most common payment errors: transposed digits, missing characters, and wrong country formats. The MOD-97 algorithm detects 98% of single-character errors and nearly all transposition errors. Validating IBANs before submitting payments prevents failed transfers, returned transactions, and associated bank fees.

Each country has its own IBAN format and length. Dutch IBANs are 18 characters (NL + 2 check digits + 4-letter bank code + 10-digit account number). German IBANs are 22 characters, UK IBANs are 22 characters, and French IBANs are 27 characters. The tool knows the correct format for each country.

A structurally valid IBAN does not guarantee the account exists or is active. IBAN validation confirms the number follows the correct format — verifying account ownership requires a bank-level check. For credit card number validation, use our Credit Card Validator.