Czechia IBAN: format, length and checker
A Czechia IBAN starts with CZ and has 24 characters. Czechia is part of SEPA.
Runs in your browser: nothing is sent to us. Checks length and the ISO 7064 mod-97 checksum.
Structure
| Country code | CZ (2 letters) |
| Check digits | 2 digits (mod-97) |
| National account number (BBAN) | 20 characters |
| Total length | 24 |
| SEPA | yes |
Check IBANs automatically
The IBAN check API validates IBANs for invoicing, payout and onboarding flows (0.001 USDC per call), and names the bank for Dutch IBANs. Pair it with the company check and sanctions screening.
Questions
How many characters does a Czechia IBAN have?
24 characters: the country code CZ, two check digits, and a 20-character national account number (BBAN).
Is Czechia in SEPA?
Yes, Czechia is in the Single Euro Payments Area, so euro transfers use SEPA credit transfers.
Does a valid checksum mean the account exists?
No. The mod-97 checksum catches typos; it does not confirm the account or its holder. In the Netherlands, your bank's name check (Verificatie van Betalingsontvanger) matches the holder.