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IBAN validator

Validates one IBAN or a bulk list against country length and structure, showing the mod 97 check working step by step.
IBAN, or one IBAN per line

Paste one IBAN or a list to validate them.

Every check runs in this tab and nothing is uploaded. The mod 97 step is the ISO 7064 check over the whole IBAN; a pass means the number is internally consistent and the country length and structure match the registry. It does not prove the account exists, and it does not re-check national check digits that live inside the BBAN (a Luhn digit in Finland, 7-3-1 in Estonia, national modulus checks in Denmark, Hungary, Norway and Sweden); those are flagged as footnotes instead of fake passes.
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Canonical HTML: https://nutter.tools/dev/iban-validator
Markdown version: https://nutter.tools/dev/iban-validator.md
Plain-text version: https://nutter.tools/dev/iban-validator.txt
Agent index: https://nutter.tools/llms.txt