Check the structure and the modulo 97 key

Before an entry, import or submission, this helps teams and individuals catch a malformed value early. Check the structure and the modulo 97 key.

Check the structure and the modulo 97 key. The result appears instantly in your browser, ready to copy, with no account, upload or storage involved.

How to use

  1. Enter the full IBAN, preferably without spaces, in the verification field.
  2. Run the check to validate the structure and the modulo 97 key.
  3. Read the result: a valid IBAN passes both the format and key checks.
  4. If an error appears, review the length, country code and characters you entered.

Example

A small organization is preparing a direct debit file and wants to avoid a bank rejection. It pastes an IBAN supplied by a member, runs the check and finds that the key does not match. It then asks for a correction before adding the value to its file.

Input

FR1420041010050500013M02606

Limits and formats

Where processing happens

The verification runs entirely in your browser. The IBAN you enter stays on your device and is not sent to any remote service.

Frequently asked questions

Can I check an IBAN that contains spaces?

Yes, spaces are often tolerated, but they can hinder reading. The safest approach is to remove spaces before running the check, then carefully review each group of characters.

Does a valid IBAN guarantee that a transfer will succeed?

No. Validation confirms the structure and key, not the account existence, its status or bank rules. A transfer may still be rejected for other reasons.

Why is my IBAN rejected when it looks correct?

Check the expected length for the country, uppercase letters and the key. A copying mistake, a confused character or a non-standard format can be enough to make the check fail.

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