What is an IBAN?
An IBAN is the international format of a bank account number. It starts with a two-letter country code (DE for Germany, GB for the UK, FR for France), then two check digits, then the national account number. Every country has a fixed IBAN length.
What the checker can and can’t tell you
It checks that the country uses IBANs, that the length is right for that country, and that the check digits are correct (ISO 13616, mod 97). That catches most typing mistakes, like a missing digit or two swapped digits.
A valid IBAN does not prove the account exists or belongs to the right person. Always confirm the account holder’s name, especially if the IBAN arrived by message or email: a changed account number is one of the most common scams.
Frequently asked questions
Is my IBAN sent anywhere?
No. The check runs in your browser and the number is never saved or sent.
Why does it say my country is not supported?
Some countries don’t use IBANs, such as the US, Canada, Australia, Nigeria and Kenya. Their account numbers follow other systems.
The IBAN is valid but the transfer failed. Why?
The account may be closed, the name may not match, or the bank may need a BIC/SWIFT code. The checker only validates the format.
Do I need the spaces?
No. Paste it with or without spaces; the checker groups it in blocks of four for you.
Sources
The checker validates the format only; it does not confirm the account or its holder. Disclaimer.