What this tool does
An IBAN (International Bank Account Number) identifies a bank account for international transfers. It has a country code, two check digits, and a country-specific account part. This validator checks the length for the country and verifies the mod-97 checksum that detects typos.
How IBAN validation works
- Move the first four characters to the end.
- Replace letters with numbers (A=10 … Z=35).
- The whole number, mod 97, must equal 1 for a valid IBAN.
Example
GB82 WEST 1234 5698 7654 32 is a valid UK test IBAN. Changing any digit will usually fail the checksum.
Important: A valid checksum only means the number is internally consistent — it does not confirm the account exists or belongs to anyone. Use test values only; never enter real banking details into online tools.