IBAN Validator: Securely Verify International Bank Account Numbers
The IBAN (International Bank Account Number) is a standardized system for identifying bank accounts across national borders with minimal risk of transcription errors. Our IBAN Validator provides a secure, private, and instant way to verify the mathematical accuracy of any IBAN.
How the IBAN Checksum Works
Every IBAN contains two "check digits" (the 3rd and 4th characters). Our tool uses the Modulo 97 algorithm (defined in ISO 7064) to validate these digits. By rearranging the IBAN and converting letters to numbers, we can determine if the sequence is mathematically consistent.
Key Features:
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Mathematical Validation: Instant Modulo 97 check.
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Structure Breakdown: Identifies Country Code, Bank Code, and Account Number.
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Automatic Formatting: Removes spaces and dashes for you.
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PrivacyFirst: All validation happens 100% locally in your browser. Your financial data never leaves your device.
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Why Validate an IBAN?
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Prevent Errors: Ensure you have the correct number before making a transfer.
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Bank Identification: Quickly see which bank and country the IBAN belongs to.
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Global Compatibility: Supports IBAN structures from over 75 countries.
Frequently Asked Questions (FAQ)
help_outlineIs my IBAN safe with this tool?
Yes. SimplyUtil is designed with a "privacy-first" architecture. We do not use a backend for this tool; all logic is executed via JavaScript on your own computer. Your IBAN is never stored or transmitted.
help_outlineDoes a valid checksum mean the account exists?
No. A valid checksum only means the IBAN is mathematically correct and follows the required structure. It does not verify if the specific account is currently active or assigned to a person.
help_outlineWhat countries are supported?
Our validator supports the standard IBAN formats for all SEPA countries and many international formats, including the UK, Germany, France, Spain, and more.
help_outlineWhat happens if my IBAN is invalid?
An invalid result usually indicates a typo. Double-check for missing digits or swapped characters. Even a single wrong letter will cause the Modulo 97 check to fail.