How do I know if my IBAN is valid?

You can check it with our free validator. Enter the IBAN in the field above and click ‘Validate IBAN’. The system applies the MOD-97 algorithm and tells you whether the format is correct, also showing the associated bank, BIC and country.

What exactly does the validator check?

The validator verifies three things: that the country code is recognised, that the length is correct for that country, and that the check digits pass the MOD-97 calculation. A successful validation means the IBAN has a valid format, though it does not confirm the account is active.

Is IBAN validation free?

Yes, individual validation is completely free and requires no registration. If you need to validate lists of IBANs in bulk, you can do so from the SEPA Generator platform with a free trial plan.

Free IBAN Validator — Check Any IBAN Number Instantly (2026)

Validate a bank account number in IBAN format using our free tool

An IBAN account number is a unique international bank account identifier used for bank transfers. The IBAN format consists of a country code, two check digits, and a bank account number. It is important to ensure the IBAN account number is correct to facilitate seamless bank transfers.

To validate your IBAN account number, simply enter it in the corresponding field and click 'Validate IBAN'. Our IBAN validator will check if the entered account number is valid and provide information about the country, bank entity, its BIC code, and the validity of the account number.

Account Number Validator

Enter your IBAN account number for validation.

Need to validate a list of IBAN account numbers?

Among the tools of the SEPA Converter, you will have access to an IBAN validator that can be used for batches. Simply paste a list of account numbers, each on a different line.

Try SEPA Generator

Don't have a valid IBAN but have an account number?

You can use our free tool to convert CCC account numbers to IBAN at the following link.

IBAN Generator

What is an IBAN number?

IBAN stands for International Bank Account Number — the international standard for identifying bank accounts. It was created to simplify cross-border transfers within the SEPA zone and beyond. Today it is mandatory in 86 countries and allows banks to verify the destination account before executing a payment.

An IBAN does not store any balance or personal information — it is solely an account identifier. Its fixed structure allows its format to be validated before sending any transfer, avoiding rejections and return fees.

How does IBAN validation work?

Our validator applies the official MOD-97 algorithm defined by ISO 13616. The process checks three things: that the country code is valid, that the check digits are correct, and that the length of the number matches the standard for that country (which varies between 15 and 34 characters).

A positive validation confirms that the IBAN has the correct format. It does not guarantee that the account is active, but it does mean it will not be immediately rejected by the receiving bank.

IBAN structure

Every IBAN consists of three parts: the country code (2 letters), the check digits (2 numbers) and the BBAN or national account number (up to 30 characters, varying by country). For example, a UK IBAN follows the format GB00 AAAA 0000 0000 0000 00.

Common errors our validator detects

The validator automatically catches the most frequent mistakes before you send a payment:

Hidden spaces pasted from an email or PDF
Incorrect length for the indicated country
Check digits that fail the MOD-97 calculation
Unrecognised or non-existent country code in the IBAN standard
Disallowed characters (accented letters, special symbols)

Other SEPA utilities

IBAN generator (CCC to IBAN) — Convert a Spanish CCC to IBAN with the MOD-97 algorithm.
Bank from IBAN — Identify which bank an IBAN belongs to.
SEPA Creditor ID — Generate and validate the SEPA Creditor Identifier.
pain.008 XML validator — Check SEPA direct debit files against the official schema.

Free IBAN Validator — Check Any Bank Account Number Instantly

Check whether any IBAN is valid in seconds. Get the bank name, BIC code and country — no registration required.