Free Tools to Validate and Decode IBANs
Several free tools can validate and decode IBANs instantly. Here is what to look for in an IBAN validator and how our tool works.
What a Good IBAN Validator Does
A reliable IBAN validator does more than check the checksum. It should:
- Verify the MOD-97 check digit calculation
- Confirm the IBAN length matches the country standard
- Decode the BBAN into its component fields (bank code, branch code, account number)
- Identify the country and indicate whether it is a SEPA member
- Work as-you-type for fast feedback
Our IBAN Decoder
IBANDecoder.com validates IBANs in real time as you type. It performs the full MOD-97 checksum, checks the length against the country standard, and decodes the BBAN structure into labelled fields. The decoder covers all 77 IBAN countries.
Checking Multiple IBANs
If you need to validate a batch of IBANs, standard IBAN validation APIs are available from banking data providers. For one-off checks, our free tool is the fastest option — paste the IBAN and see results instantly.
IBAN Country Reference
Our country format pages provide the full structure for each of the 77 IBAN countries, including annotated examples and length references. The common errors guide covers the most frequent mistakes and how to spot them.