United Kingdom IBAN Validator GB
Validate a United Kingdom IBAN and view its structure: checksum, bank code and format. 100% in your browser - no upload.
What is a United Kingdom IBAN?
A United Kingdom IBAN is the standardized 22-character account number used for United Kingdom bank transfers, starting with the country code GB and 2 check digits followed by the national bank code and account number. It is validated with the ISO 13616 mod-97 checksum — paste one above to check it instantly, in your browser.
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United Kingdom IBAN format
- Country code
- GB
- Length
- 22 characters
- Structure
- GB + 2 check digits + 18-character BBAN
- Example
- GB82 WEST 1234 5698 7654 32
United Kingdom IBAN structure explained
How a United Kingdom IBAN is built, segment by segment, from our validated example:
Major United Kingdom banks and their codes
The national bank codes of the largest United Kingdom banks, embedded in every IBAN they issue:
| Bank | Sort code | BIC / SWIFT |
|---|---|---|
| Barclays Bank UK | BUKB | BUKBGB22 |
| HSBC UK | HBUK | HBUKGB4B |
| Lloyds Bank | LOYD | LOYDGB2L |
| NatWest | NWBK | NWBKGB2L |
| Royal Bank of Scotland | RBOS | RBOSGB2L |
| Santander UK | ABBY | ABBYGB2L |
| Halifax | HLFX | HLFXGB22 |
| Nationwide Building Society | NAIA | NAIAGB21 |
| TSB Bank | TSBS | TSBSGB2A |
| The Co-operative Bank | CPBK | CPBKGB22 |
Bank codes and BIC/SWIFT identifiers are provided for reference. Always confirm the full IBAN with your bank.
See all United Kingdom banks and their codesAbout United Kingdom IBANs
A United Kingdom IBAN starts with the country code GB, followed by 2 check digits and the national account number (BBAN), for a total of 22 characters. ValidateFin verifies the mod-97 checksum (ISO 13616), the length and the format - entirely in your browser, no data sent to any server.
- •The United Kingdom is not in the EU but remains part of the SEPA zone, so a GB IBAN is still accepted for euro SEPA payments.
- •The GB BBAN embeds the 6-digit sort code (shown as three pairs, e.g. 12-34-56) and the 8-digit account number used for domestic Faster Payments and BACS.
- •Unlike most countries, the UK bank code is a 4-letter SWIFT bank code (e.g. WEST) rather than digits, sitting just before the sort code.
United Kingdom IBAN — frequently asked questions
How many characters does a United Kingdom IBAN have?
A United Kingdom IBAN is exactly 22 characters long: the country code GB, 2 check digits and a 18-character BBAN (national account number). Any United Kingdom IBAN that is shorter or longer than 22 characters is invalid.
How do I check whether a United Kingdom IBAN is valid?
Paste the IBAN into the validator above. ValidateFin verifies that it starts with GB, has 22 characters and passes the mod-97 checksum defined by ISO 13616. The check runs entirely in your browser — nothing is uploaded to any server.
Where can I find my United Kingdom IBAN?
Your United Kingdom IBAN appears on your bank statements, in your online or mobile banking under account details, and on your bank card documentation. It always begins with the GB country code followed by the 2 check digits.
What is the structure of a United Kingdom IBAN?
A United Kingdom IBAN (GB) is made of the GB country code, 2 check digits, the national bank code and the account number — 22 characters in total. The validator above breaks any United Kingdom IBAN down into these parts.
How do I find the bank from a United Kingdom IBAN?
The bank code is embedded right after the check digits in every United Kingdom IBAN. Match it against the bank code table above, or paste the IBAN into the validator to identify the issuing institution.