Free Online IBAN Validator

An IBAN validator confirms an International Bank Account Number matches its country's expected length and passes the ISO 13616 mod-97 checksum.

Your data is processed entirely in your browser and never sent to any server.

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How to Use This Tool

  1. Paste or type the IBAN. Spaces are ignored and letters are upper-cased automatically.
  2. Read the country, expected length, actual length and checksum result.
  3. If the checksum fails, re-check for a misread digit — IBANs printed on paper are the usual culprit.
  4. Confirm account details with the recipient before initiating a payment.

What Is an IBAN Validator?

IBAN — defined by ISO 13616 — combines a 2-letter country code, a 2-digit checksum and a country-specific BBAN identifying the bank, branch and account. Length varies between 15 characters (Norway) and 31 (Malta). The checksum is computed by rearranging the IBAN, mapping letters A=10 through Z=35 and taking the resulting big integer modulo 97; a valid IBAN gives 1.

Finance teams verify supplier IBANs before initiating a SEPA payment. Onboarding flows for cross-border services check IBANs as part of KYC. Accountants confirm an IBAN copied from a paper invoice matches the printed form. This validator ships hard-coded lengths for the 40+ countries that currently issue IBANs and runs the mod-97 check in your browser, telling you which step failed — structure, length or checksum.

It does not query a bank, so it can't tell you whether the account is open or whose name is on it — only that the format is internally consistent.

Frequently Asked Questions

What countries use IBAN?
Most European countries plus parts of the Middle East and North Africa — 40+ supported here.
What does validation check?
Length per country, ASCII structure and the mod-97 checksum defined by ISO 13616.
Does it verify the account exists?
No, only format. Real verification requires a bank API.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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