Check whether a United Kingdom IBAN is valid — country, length and mod-97 checksum — and break out the bank details. Instant and free, right in your browser.
| Country | United Kingdom (GB) |
| IBAN length | 22 characters |
| Structure | GB + 2 check digits + 18-character BBAN |
| Valid example | GB68 7654 3210 9876 5432 10 |
Every United Kingdom IBAN starts with GB and is 22 characters long. The two digits after the country code are a checksum (ISO 7064 mod-97) computed from the rest of the number, so a single mistyped character makes the whole IBAN invalid — which is exactly what this validator catches before a payment is sent.
A United Kingdom IBAN is exactly 22 characters long, beginning with the country code GB followed by two check digits and the national bank account number (BBAN).
A correctly-formed example is GB68 7654 3210 9876 5432 10. The two digits after GB are a mod-97 checksum that must match the rest of the number.
By confirming it is 22 characters, starts with GB, and passes the ISO 7064 mod-97 checksum. The tool above does all three instantly, in your browser — no data is sent anywhere.