Value
Spaces are fine. We check country, length and mod 97. Nothing is sent to the server.
Result
Type a value or load the sample.
Type a value or load the sample.
Structure
How it works
An IBAN starts with a country code and two check digits. We move the first four characters to the end, convert letters to numbers and take modulo 97. The remainder must be 1.
A mathematically valid IBAN does not prove the account exists at a bank.
Country
First 2 letters
Each country has a fixed length (RO = 24).
Check
MOD-97
If the remainder is not 1, the IBAN is wrong.
BBAN
The rest
For RO: 4-character bank code + 16-digit account.
Important:
Do not send someone else’s IBAN in chat. Checks here run only in the browser.
Useful notes
- The RO sample is the standard test IBAN (bank AAAA), not a real account.
- SEPA and other countries with a known length are accepted.
- The validator does not query a bank and does not send money.
- Reloading the page clears the field.