IBAN checker
Check an IBAN's country format and checksum in your browser. See length and formatting errors without contacting a bank.
One IBAN, up to 128 input characters and 34 account characters. Covers the 89 national formats in Swift registry release 103. Unknown country prefixes are reported as unsupported. No bank, ownership, account-existence, balance or domestic checksum check is performed. Paste one IBAN. This public example comes from the Swift registry. Country format and checksum only; no bank is contacted. Results update as you type. Up to 128 characters.
Your result
How to use IBAN checker
- Paste one IBAN. Spaces, tabs, line breaks and nonbreaking spaces are accepted.
- Review the country, required length, national format and checksum results.
- If a check fails, verify the number with its source. Download the masked report if needed.
Useful next steps
Check the number's format
Paste one IBAN, with or without spaces. Lowercase ASCII letters are accepted. The tool checks the country prefix, expected length, the letter and digit positions in its national format, and the MOD97 checksum. Results explain which check failed instead of treating every error as the same problem.
Know what a match means
Matching format and check digits can catch common copying mistakes. They do not confirm that a bank, branch or account exists, or that an account belongs to the intended recipient. Country-specific domestic account check digits are outside this checker. A number with a correct global IBAN checksum can still fail a domestic rule.
Keep the account number on your device
No account lookup is made. Processing stays in this tab, and account strings are not included in tool analytics. The downloaded JSON report keeps the country and final four characters, with the rest masked. Clear the input when finished. The bundled country formats come from Swift IBAN Registry release 103, published in September 2026.