IBAN Validator
Check an IBAN's structure, country length and ISO 7064 checksum.
This tool runs entirely in your browser. Your files are never uploaded to a server.
Valid: Valid GB IBAN — checksum and length both match.
- Country code: GB
- Length: 22 characters
Clear the entered value before starting another check. Validation runs locally and does not check against any external registry, server, or account.
What this tool does
Checks an International Bank Account Number for correct structure, the expected length for its country when known, and a valid ISO 7064 MOD 97-10 checksum.
How to use it
Enter an IBAN with or without spaces. The checker uppercases it, confirms the two-letter country code and two check digits, rearranges and converts letters to digits, and computes the checksum.
Example
Entering GB82 WEST 1234 5698 7654 32 returns valid, confirms the 22-character length expected for GB, and shows the value grouped in fours.
Validation
The value must start with two letters and two digits followed by alphanumeric characters, total 15–34 characters; when the country code is in this checker's length table, the total length must match exactly; the ISO 7064 MOD 97-10 checksum over the rearranged, letter-to-number-converted string must equal 1.
How to interpret the result
A valid result confirms the IBAN is structurally well-formed and passes its checksum — it does not confirm the account exists, is open, or belongs to any particular holder.
Limitations
The country-length table covers commonly used IBAN countries; for a country code outside that table, only the checksum is verified and length is not cross-checked. For an authoritative check, confirm the number with your bank.
Privacy
All processing uses local browser APIs and this tool does not upload the values you enter.
Frequently Asked Questions
- What does IBAN Validator do?
- Checks an International Bank Account Number for correct structure, the expected length for its country when known, and a valid ISO 7064 MOD 97-10 checksum.
- How does it handle invalid input?
- The value must start with two letters and two digits followed by alphanumeric characters, total 15–34 characters; when the country code is in this checker's length table, the total length must match exactly; the ISO 7064 MOD 97-10 checksum over the rearranged, letter-to-number-converted string must equal 1.
- Is entered data uploaded?
- All processing uses local browser APIs and this tool does not upload the values you enter.
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