How to use the IBAN Checker
- Paste IBANs, one per line, or choose a TXT or CSV file. For a CSV, pick the column that holds the IBANs.
- Select Check IBANs and read the result and explanation for each line.
- Download the report as CSV if you need to keep or share it.
Supported files and limits
- A valid result means the IBAN is correctly formed. It does not prove the account exists, is open or belongs to the intended person.
- Country formats come from the SWIFT IBAN registry (release 103, September 2026) and cover 89 countries.
- Spaces and letter case are ignored. Up to 1,000 IBANs or 1 MB per check.
- Bank names and BIC codes are not looked up, because that would require an online service.
Common questions
How is an IBAN checked?
The country code sets the required length and format. Then the first four characters are moved to the end, letters become numbers (A = 10 … Z = 35), and the resulting number must leave a remainder of 1 when divided by 97.
Can a valid IBAN still be wrong?
Yes. The check digits catch most typing errors, but a correctly formed IBAN can belong to someone else. Confirm new or changed bank details with the payee by phone, especially after an email request.
Why is my country not supported?
Countries such as the United States, Canada and Australia do not use IBANs. Payments there use account numbers with routing or sort codes instead.
Are my IBANs uploaded?
No. Checking happens in your browser, and nothing is sent to our server or anyone else.