IBAN Validator
Check any IBAN with the mod-97 algorithm.
Frequently Asked Questions
How does IBAN validation work? +
The first four characters are moved to the end, letters are converted to numbers (A=10, B=11, etc.), and the resulting number is checked with modulo 97. A valid IBAN always produces a remainder of 1.
Which countries use IBAN? +
Over 80 countries use IBAN, including all EU/EEA members, the UK, Turkey, Saudi Arabia, Brazil, and others. Each country has a fixed IBAN length, ranging from 15 to 34 characters.
What are check digits? +
The two digits after the country code are check digits. They are calculated to make the mod-97 validation work. They help catch typos and transposition errors in the account number.
Does this tool verify the bank account exists? +
No. This tool validates the IBAN format and check digits only. It confirms the number is structurally correct but does not contact any bank to verify the account is real or active.