A Developer's Guide to the IBAN Validator

The IBAN (International Bank Account Number) Validator is a tool designed for developers and financial professionals who need to verify the structural integrity of an IBAN. It uses the standard MOD-97 checksum algorithm to confirm that the number is correctly formatted and has a valid check digit.

Disclaimer: This tool only validates the IBAN's format and checksum. It does not check if the bank account actually exists or has funds. It is for development and testing purposes only.

Features

• Checksum Validation: Implements the official MOD-97 algorithm to verify the IBAN's integrity.
• Format-Agnostic Input: You can paste the IBAN with or without spaces; the tool will automatically clean it for validation.
• Clear Results: Get a simple, unambiguous result telling you whether the IBAN is valid or invalid, along with a message explaining why.

How to Use

1. Enter the IBAN: Type or paste the International Bank Account Number you want to check into the input field.
2. Click Validate: Press the "Validate" button.
3. Review the Result: An alert will appear below with the outcome.
   • Green "Valid IBAN": The IBAN has the correct structure and passed the checksum test.
   • Red "Invalid IBAN": The IBAN failed the validation. The message will provide a reason, such as an incorrect length or a failed checksum.