FreeDev Tools

IBAN Validator

Validate IBANs with the mod-97 checksum and per-country length rules.

Runs locally in your browser. Your input is not uploaded.

How to Use

  1. 1

    Paste IBANs

    One per line, spaces allowed.

  2. 2

    Read the verdicts

    Country, length, and mod-97 checksum are all verified.

  3. 3

    Fix flagged entries

    Failures pinpoint whether format, length, or checksum is wrong.

Frequently Asked Questions

Three ways: the country code must be a known IBAN participant, the length must match that country's specification (22 for Germany, 27 for France…), and the ISO 7064 mod-97 checksum over the rearranged digits must equal 1.

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