SECURITY TOOL
IBAN Validator
Validate an IBAN's format and mod-97 checksum.
Result
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Country / length
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About this tool
Validate an International Bank Account Number (IBAN) using the standard mod-97 checksum defined in ISO 13616 — the same check banks use to catch typos before a transfer is even submitted. This only verifies the number's structure and checksum; it does not confirm the account actually exists or belongs to anyone.
Frequently asked questions
- How does the mod-97 checksum work?
- The first four characters (country code + check digits) are moved to the end, letters are converted to numbers (A=10, B=11, …), and the resulting large number must leave a remainder of exactly 1 when divided by 97.
- Does a valid result mean the account is real?
- No — it only confirms the IBAN is internally consistent and correctly formatted. Confirming an account actually exists and is open requires checking with the bank or payment processor directly.
- Is my IBAN sent anywhere?
- No — validation happens entirely in your browser using plain arithmetic; nothing is transmitted or stored.