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IBAN validator

Check an IBAN format and checksum (MOD-97). It validates structure, not whether the account exists.

Enter it with or without spaces — spacing and letter case don't matter.
Examples (click to fill in):
Enter an IBAN to validate
Formatted—
Country code—
Check digits—
Bank code(LT, digits 5–9)—

This tool only checks the IBAN format and checksum (MOD-97). It does not confirm whether the account actually exists, is active, or belongs to the intended recipient.

About IBAN validation

An IBAN (International Bank Account Number) is a standardised format for writing a bank account. It starts with a two-letter country code, followed by two check digits and the bank and account part. The tool checks whether the number matches the country's format and whether anything was mistyped.

Validation relies on the MOD-97 algorithm: a check value is computed from the IBAN and must match the recorded check digits. Important: the tool only checks the structure and the checksum — it does not confirm that the account actually exists, is active, or belongs to the named recipient.

  • First, the length and characters are checked against the country's format. Then the MOD-97 algorithm is applied: the first four characters are moved to the end, letters are converted to numbers, and the whole value is divided by 97 — a valid IBAN always leaves a remainder of 1.