Free IBAN Validator
Check whether an International Bank Account Number is correctly formatted and passes the MOD-97 checksum, and see the country, check digits and national BBAN broken out. Validation is done entirely in your browser.
IBANs carry their own check digits, just as cards use the Luhn algorithm — the Credit Card Validator handles those. For spotting unknown digests, see the Hash Identifier.
How to use the IBAN Validator
- 1 Paste the IBAN, with or without spaces.
- 2 Read whether the length is correct for the country and whether the checksum passes.
- 3 See the parsed country code, check digits and national account part.
- 4 Use the formatted output if you need it grouped in fours.
How to Use
Type or paste an IBAN (spaces are ignored) and the result updates instantly. The tool reports whether the structure and checksum are valid and shows the detected country.
- Validates format and the ISO 13616 MOD-97 checksum
- Detects the country from the first two letters
- Breaks out check digits and the national account part
- Shows a human-formatted IBAN in groups of four
- No data is stored or transmitted
What the IBAN check verifies
An IBAN is valid when its structure matches the country rules and its checksum passes MOD-97. Passing means the number is well-formed — it does not guarantee that the account exists. Always confirm recipient details before sending money.
Frequently asked questions
How does the IBAN checksum work?
It uses MOD-97. The first four characters move to the end, letters are converted to numbers (A is 10, B is 11 and so on), and the resulting integer must leave a remainder of 1 when divided by 97. That catches a mistyped character with near-certainty.
Why must the length match the country?
Because every country fixes its own IBAN length — Germany uses 22 characters, Norway 15, Malta 31. A correct checksum on the wrong length means something is still wrong, so the length is checked first as a fast structural test.
Does a valid IBAN mean the account exists?
No. It confirms the format and the checksum, nothing more. Whether the account is open, belongs to the name you were given, or accepts a payment is only knowable by the bank — which is why payment providers run their own verification.
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