IBAN validator
Check an IBAN's country, length and mod-97 check digits — entirely in your browser.
Runs 100% in your browser100% in your browser — your IBAN is never uploaded.
How to validate an IBAN
- Enter an IBAN. Paste the IBAN with or without spaces.
- Validate. We check the country, length and mod-97 check digits locally.
- Review. See whether it is valid and its decoded parts.
About IBANs
The International Bank Account Number standardizes account numbers across more than 70 countries so that cross-border payments route correctly. Its last safeguard is a pair of check digits computed with the mod-97 algorithm, which catches almost every single-character typo and digit transposition. Validating an IBAN before you save or send it prevents failed or misrouted transfers. This tool checks the country code, the country-specific length and the check digits — all locally, so nothing sensitive is transmitted. To validate the bank’s SWIFT/BIC code as well, use the SWIFT/BIC lookup.
Frequently asked questions
- It verifies the country code, the exact length for that country, and the ISO 7064 mod-97 check digits — the same maths banks use to catch typos in an IBAN.
- No. Validation confirms the IBAN is correctly formed and free of typos. It does not contact any bank or confirm the account is real or open.
- No. The entire check runs in your browser with no network calls, so your banking details never leave your device.
- Usually a single mistyped character, the wrong length for the country, or an unsupported country code. The error message tells you which.
- No — by design. This is a validator only; it never produces account numbers.