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IBAN Validator

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Enter an IBAN (International Bank Account Number) to check whether it's valid, using the official checksum formula.

IBAN Validator

Live
Result
Valid IBAN
Country
Germany (DE)
Length
22 characters
Checks format and checksum only - it doesn't confirm the account actually exists or is active.

The method

Move the first 4 characters to the end Convert each letter to two digits (A=10, B=11, ... Z=35) The resulting number, divided by 97, must leave a remainder of exactly 1
Example

DE89370400440532013000 (a standard test IBAN): after rearranging and converting, the number mod 97 = 1, so it's valid.

Step-by-step guide

  1. Enter an IBAN, with or without spaces.
  2. Read the result - valid or invalid, the country, and the character length.

What "valid" actually confirms - and what it doesn't

An IBAN's checksum is specifically designed to catch typos and transcription errors - a single mistyped or transposed character will almost always fail the MOD-97 check, which is exactly why banks use this system to catch mistakes before a payment is sent. However, passing this check only confirms the IBAN is correctly *formatted* - it does not confirm the account actually exists, belongs to a particular person, or is currently active. Always verify important payment details directly with the recipient or their bank.

Common mistakes

Assuming a "valid" result guarantees the account is real and active - it only confirms the format and checksum are correct, not that the account exists.
Mixing up the letter O and the digit 0, or the letter I and the digit 1, when typing an IBAN by hand - these look similar but are treated completely differently by the checksum.

Frequently asked questions

Does every country use IBAN?

No - IBAN is widely used across Europe, the Middle East, and parts of Latin America and the Caribbean, but several major economies (including the US, Canada, Australia, and Japan) use different account numbering systems entirely.

Why does the IBAN length vary by country?

Each country's banking authority defines its own IBAN length and internal structure (bank code, branch code, account number) - lengths commonly range from 15 to 34 characters depending on the country.

Can this tool find my IBAN for me?

No - this validates an IBAN you already have. Your actual IBAN is issued by your bank and typically shown on your bank statement, check book, or online banking portal.

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