IBAN Validator & Checker
Validate IBAN numbers with country detection, length verification, and mod-97 checksum validation. Supports 30+ countries.
Runs in your browser. No data leaves your device.
Frequently Asked Questions
How does the IBAN Validator work?
The tool first identifies the country from the two-letter ISO prefix and verifies the total length matches that country's required IBAN length. It then performs the ISO 7064 mod-97 checksum: the first four characters are moved to the end, all letters are converted to two-digit numbers (A=10, B=11, ..., Z=35), and the resulting large number is checked for remainder 1 when divided by 97. A remainder of 1 confirms the IBAN has no transcription errors.
What is an IBAN?
An International Bank Account Number is a standardized format for identifying bank accounts across borders. It starts with a two-letter country code, two check digits, and then the country-specific account number.
What does the validator check?
Country code validity, correct length for the detected country, and the mod-97 checksum verification. A valid checksum confirms the IBAN has no transcription errors in the digits.
Is my IBAN data stored or sent anywhere?
No. Validation happens entirely in your browser. Your IBAN is never transmitted to any server. This makes it safe to validate sensitive banking information.