Finland IBAN validator
How the IBAN format works
- Format
- FI + 2 check digits + 14-digit bank/account number (18 chars)
- Example
- FI2112345600000785
Things to watch for
- 18 characters total, all numeric
^FI[0-9]{2}[0-9]{14}$A Finnish IBAN is 18 characters — the shortest of the Nordic IBANs — made up of “FI”, two check digits, and a single 14-digit block that runs the bank code and account number together with no internal boundary visible in the IBAN string itself. Because Finland already used a continuous all-numeric account numbering scheme before IBAN was introduced, converting to IBAN meant tacking “FI” and two check digits onto the front rather than restructuring the number into separate segments. Anyone paying a Finnish supplier, splitting a bill with a contact in Finland, or filling in a SEPA transfer form needs all 18 characters correct, since there’s no visual segment break to catch a stray digit by eye.
How this validator works
This tool checks the “FI” prefix, confirms the trailing block is exactly 14 digits, and then runs the real mod-97 checksum (ISO 7064) Finnish banks use to generate valid IBANs — entirely in your browser, nothing sent to a server, no signup, result as you type. Because the 14-digit block has no sub-segments enforced by the IBAN format itself, the checksum is doing more of the error-catching work here than in countries where bank and branch codes are visually distinct.
What a pass doesn’t tell you
A pass confirms the 18 characters are correctly formed and internally consistent — not that the account exists, is open, or belongs to whoever you expect. This tool does no bank-code-to-bank-name lookup and never contacts Bank of Finland or any commercial bank. If a Finnish IBAN fails, the most common cause is a single mistyped or transposed digit somewhere in the 14-digit block — re-check it character by character against the original source rather than assuming the whole number is wrong.
Scope: Finnish IBAN structure and mod-97 checksum validation only — not payment processing, bank-name resolution, or confirming an account is active, none of which a client-side check can establish. Use this validator to catch a typo before a transfer fails; use your bank to confirm the account itself.
Content last reviewed 2026-07-07.
IBAN FAQ
How long is a Finnish IBAN and what's in it?
18 characters: 'FI', two check digits, then a single 14-digit block that carries both the bank code and the account number with no separate segment boundary marked in the IBAN itself — for example FI2112345600000785.
Why doesn't the Finnish IBAN show separate bank and account segments like some other countries?
Finland's domestic account numbering already ran the bank code and account number together as one continuous digit string before IBAN existed, so the IBAN simply carries that same 14-digit block forward unchanged — your bank or statement can tell you where the bank code ends and the account number begins for your specific number.
Does a passing check confirm my Finnish IBAN belongs to the right person?
No. This tool only confirms the 18 characters are correctly formatted and pass the mod-97 checksum — it does no bank-name lookup and never contacts a bank or Bank of Finland. Confirming ownership requires the account holder or your own bank's payment verification.