Free IBAN checkers compared: what each one checks

An IBAN checker tells you whether a number is well formed before you pay it or save it. Two free ones, the fastast IBAN validator and the iban.com IBAN checker, run the same core test on country code, length and check digits. The choice rests on what each adds.

Use iban.com when you need the bank’s BIC. Use fastast for a list of IBANs, an IBAN built from a domestic account number, or a suggested fix when one character is wrong. Neither can tell you who holds the account: in the euro area, your bank checks that when you pay.

What does each free IBAN checker check?

Both check the format; iban.com adds bank data and a second set of check digits, fastast adds a list mode, an IBAN builder and suggested fixes. The fastast column was tested on the tool. The iban.com column follows iban.com’s own checker and IBAN Suite pages, read on 18 September 2026.

Which free checker handles a whole list of IBANs?

The fastast validator does: paste up to 200 IBANs, one per line, into Several IBANs at once. Each line gets its own verdict, a refused one its Reason, and Download as CSV hands the table to a spreadsheet. On iban.com, bulk validation belongs to the paid IBAN Suite plans, according to its IBAN Suite page.

What does each checker do when one character is wrong?

The fastast validator proposes the fix; iban.com runs a second test that catches errors the IBAN check digits miss. When fastast refuses a single IBAN, Did you mean lists up to five IBANs one keystroke away that pass every check. Its caveat: a typo is more likely than a wrong account, but only the statement can tell.

The second test matters for an IBAN built from a domestic account number. Its check digits are computed to fit that number, typo included. On the IBAN validator, a French account number with one digit changed came back as a Valid IBAN.

Many countries put their own check digits inside the domestic number, as Wikipedia’s IBAN article lists country by country. iban.com’s checker page says it tests them for 48 countries.

Does either checker confirm who owns the account?

No. Both check the number, and neither knows the name behind it. iban.com sells name checks to companies as a separate API, according to its Verification of Payee page.

For your own payments, the bank does it. Since 9 October 2025, payment providers in the euro area must check, free of charge, that the payee’s name matches the IBAN, according to the European Commission.

Questions

Why does iban.com say I have exceeded the number of allowed searches?

Its free checker is a demo of the paid IBAN Suite. Past a number of searches, it answers “You have exceeded the number of allowed searches for the free IBAN Validation service” and points to a subscription. The fastast validator asks for no account.

Which checker should I use for an IBAN from outside Europe?

Either one checks the country code, the length and the check digits, for the countries it knows. iban.com’s page says it knows the formats of 116. The fastast validator splits the number into bank code and account number for the SEPA zone and its neighbours. For a Turkish IBAN, it says the domestic layout is not in its registry snapshot.

Do I need a checker that finds the BIC?

Not for a SEPA transfer. In SEPA countries the IBAN is enough to identify the account, and banks may no longer ask their customer for the payee bank’s BIC, as Wikipedia’s IBAN article records.

Sources and further reading

• iban.com IBAN Checker — the checks its free checker performs, the BIC lookup, and domestic check digits for 48 countries.
• iban.com IBAN Suite — bulk validation as a feature of the paid plans.
• European Commission — free payee verification in the euro area from 9 October 2025.