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IBAN validator

Paste an IBAN to check its country code, length, BBAN format and MOD-97 check digits. If something is wrong, you see what and where. Formats known for 91 countries.

Spaces, lowercase letters and a leading "IBAN" are fine.

With JavaScript off, the IBAN is sent to our server only to check it. It is not stored.

What the validator checks

Every IBAN goes through these checks in order. When one fails, the checks that depend on it are marked as not checked.

Check What it verifies
Characters Only letters A–Z and digits. Spaces, line breaks, lowercase letters and a leading "IBAN" are cleaned up first.
Country The first two letters are a country whose IBAN format is in our list (91 countries).
Length Each country has one fixed length. Across our list it goes from 15 to 33 characters.
BBAN format Each position of the national part (BBAN) has the type the country's format asks for: a digit, a letter, or either.
Check digits (MOD-97) The two digits after the country code pass the MOD-97 test, which catches typing mistakes.
National check digits Some countries add their own check digits inside the BBAN, such as Italy's CIN or the French clé RIB. They are verified where the national rule is known.

The MOD-97 rule in one line

Move the first four characters to the end, replace each letter with two digits (A = 10 … Z = 35) and divide by 97: for a valid IBAN the remainder is 1.

How IBAN check digits work

Common errors and what they mean

  • Wrong length
    A character is missing or doubled, often after copying from a PDF or typing from paper. Compare the IBAN with the original in groups of four.
  • Check digits do not match
    Usually one mistyped character or two neighbouring characters swapped: MOD-97 always catches those. The result shows which check digits would fit, but fix the typo, not the check digits.
  • Characters not allowed
    Dashes, dots, slashes or letters from another alphabet. An IBAN contains only A–Z and 0–9.
  • Wrong type of character
    A letter where the country expects a digit, or the other way round. The letter O and the digit 0, or I and 1, are the usual mix-ups.
  • Unknown country
    The first two letters are not in our list. Check them for a typo: the country may also not use IBANs at all.

A valid format is not an existing account

A valid result means the IBAN is well-formed: country, length, format and check digits fit together. It does not tell you whether a bank issued it, whether the account is open or who holds it.

Banks check that when a payment is made. In the euro area, Verification of Payee also compares the payee's name with the account before a transfer, and the UK has Confirmation of Payee.

Test IBANs from our generator pass this validator because they are built to be well-formed. That is what makes them useful for testing, and why a valid result never proves that an IBAN is real.

Generate a test IBAN Test IBANs for developers and QA

What happens to the IBAN you check

With JavaScript on, the check runs in your browser and the IBAN is not sent to our server. Without JavaScript, the form sends it to our server once, only to check it. It is not stored and never appears in the page address.

Learn about IBANs

IBANpedia explains the IBAN in plain language, from its history to the differences between countries.

Open IBANpedia