IBAN Validator & Checker

Instantly check the validity of any International Bank Account Number (IBAN). Ensure your cross-border and domestic wire transfers are safe by verifying the checksum, country code, and formatting before you send money.

IBAN / SWIFT Validator

How to Use the IBAN Checker

Validating an International Bank Account Number is crucial before initiating an international wire transfer. A simple typo can result in rejected payments, lost funds, and expensive bank fees. Here is how to use our tool:

  1. Find the IBAN: Locate the IBAN on your bank statement, invoice, or banking app.
  2. Enter the Number: Type or paste the number into the input field above. Don't worry about spaces or dashes; our tool automatically cleans the formatting.
  3. Review the Result: The validator will instantly tell you if the mathematical checksum is valid, and it will extract the Country Code and Basic Bank Account Number (BBAN).

How Does IBAN Validation Work?

Our IBAN checker doesn't just look at the length of the string; it uses the official international standard MOD-97 checksum algorithm (ISO 13616) to verify structural integrity.

The Validation Process:

  • 1. Length Verification: Ensures the IBAN length matches the specific requirement for that country (between 15 and 34 characters).
  • 2. Rearrangement: Moves the first four characters (the country code and check digits) to the end of the string.
  • 3. Integer Conversion: Converts all letters to numbers (where A=10, B=11, up to Z=35).
  • 4. MOD-97 Calculation: Divides the massive resulting number by 97. If the remainder is exactly 1, the IBAN is mathematically valid!

Frequently Asked Questions

Does this tool check if the bank account actually exists?

No. This tool checks the mathematical and structural validity of the IBAN format. It guarantees that the number is formatted correctly and hasn't been mistyped, but it cannot connect to a bank's private database to verify if the account is currently open, active, or funded.

Is it safe to type my IBAN here?

Yes, absolutely. This validator runs entirely locally in your web browser using JavaScript. Your IBAN is never stored, saved, or transmitted to any external servers.

What is a BBAN?

BBAN stands for Basic Bank Account Number. It represents the domestic part of the IBAN (everything after the first four characters). The BBAN typically contains the local bank identifier (sort code, routing number, or branch code) and the specific individual account number.