IBAN Validator
Check an IBAN's mod-97 checksum, country, and formatting — locally.
✓ Valid IBAN
- Country:
- DE
- Formatted:
- DE89 3704 0044 0532 0130 00
How IBAN validation works
An IBAN (International Bank Account Number) is validated with the ISO 7064 mod-97 checksum: move the first four characters to the end, replace each letter with two digits (A=10 … Z=35), then the whole number modulo 97 must equal 1. This runs entirely in your browser — your account number is never sent anywhere.
More validators: credit card, email, and IP address.
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