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Validate IBAN Checker

Paste an IBAN to validate its checksum (MOD 97) and country-specific length. You’ll also get a normalized and spaced format output. No network calls—runs locally in your browser.

Category: Data · URL: /tools/validate-iban-checker.html
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

This tool validates IBANs using the standard rearrange + MOD 97 checksum and (when known) the official country length.

  1. Paste one IBAN (or multiple IBANs, one per line) into the input box.
  2. Click Validate.
  3. Review Status, Reason (if invalid), and the Normalized/Formatted IBAN.
  4. Use Copy output to copy the results.
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Secondary intents covered: Check whether an IBAN is valid before saving it, Find why an IBAN is invalid (length vs checksum), Normalize an IBAN (remove spaces and punctuation), Format an IBAN into 4-character groups for readability, Validate multiple IBANs in one paste (one per line), Extract country code, check digits, and BBAN portion, Confirm the expected IBAN length for a given country, Generate a copyable validation report for support tickets

FAQ

What does IBAN validation check?

It checks the IBAN’s structure (country code, check digits), country-specific length (when known), and the MOD 97 checksum.

Does a valid IBAN mean the account exists?

No. Validation only confirms the number is internally consistent; it can’t confirm the account is open or able to receive funds.

What is the MOD 97 rule?

The IBAN is rearranged, letters are converted to numbers (A=10…Z=35), and the result must have remainder 1 when divided by 97.

Why does the tool say “length mismatch”?

Many countries have a fixed IBAN length; if the input length doesn’t match that country’s standard, it’s invalid (with strict length enabled).

Can I validate multiple IBANs at once?

Yes—paste one IBAN per line (or separated by commas/semicolons) and click Validate to get a report for each.

What’s the difference between “normalized” and “formatted”?

Normalized removes spaces/punctuation and uppercases; formatted groups the IBAN into blocks of 4 characters for readability.

Is my data sent to a server?

No. This tool runs locally in your browser and does not perform network requests.