So nutzt du: IBAN Validator
- Type or paste an IBAN — spaces, dashes and lowercase are fine. The result updates as you type.
- Read the verdict: the country, whether the length and format match that country, and whether the check digits are right.
- Copy the IBAN in its standard printed format (groups of four) or electronic format (no spaces), and see the bank and branch code.
- To check many, use Check a list; to test a form or payment sandbox, use Test IBANs.
How IBAN validation works
An IBAN starts with a two-letter country code and two check digits, followed by the domestic account number (the BBAN). Every country has a fixed length — 22 characters for Germany, 27 for France, 18 for the Netherlands — and a fixed pattern of letters and digits.
The check digits come from the ISO 7064 mod 97-10 algorithm: move the first four characters to the end, turn every letter into a number (A = 10 … Z = 35) and divide by 97. A valid IBAN always leaves a remainder of 1. This catches all single-character typos and almost all swapped neighbors.
What a valid IBAN does — and doesn’t — prove
A valid IBAN has the right shape and checksum, so it is very likely typed correctly. It does not prove that the account exists, is open or belongs to the person you expect — only the bank (or a confirmation-of-payee service) can confirm that. For card numbers, see the Credit Card Validator.
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