IBAN Validator
Validate any International Bank Account Number against ISO 13616 — MOD-97 checksum, country-specific BBAN structure, and SEPA reachability. Everything runs in your browser; the account number is never sent to a server.
Check digit calculator
Compute the two check digits for a country code + BBAN.
How it works: the IBAN is rearranged (country code and check digits moved to the end), letters are converted to numbers (A=10 … Z=35), and the result must equal 1 mod 97. The BBAN is then checked against the national format registered with SWIFT for that country.
A valid checksum confirms the number is well-formed — it does not confirm the account exists or is open. Always confirm account details with the receiving bank before sending funds.