IBAN Validator

Validate an IBAN number online and check its country, length and checksum — free.

Checked with the same mod-97 checksum banks use. This confirms an IBAN is well-formed — it doesn't confirm the account actually exists.

About

About the IBAN Validator

Validates an IBAN's checksum and country, and shows it neatly grouped into blocks of four characters.

Finance and accounting teams use it to catch a mistyped IBAN before sending a payment instruction, and developers building payment or banking features use it to validate user input before submitting it to a payment processor. It's one of many free data tools on Toolapt, and like every tool here, it's free to use with no sign-up and no limit on how many times you run it.

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Guide

Using the IBAN Validator

  1. 1

    Step 1

    Paste or type the IBAN, with or without spaces.

  2. 2

    Step 2

    Click "Check", or just press Enter.

  3. 3

    Step 3

    Read whether the checksum passes, plus the country, length and formatted grouping.

  4. 4

    Step 4

    Click "Clear" to check another IBAN.

  • Validates the IBAN using the mod-97 checksum, the same check real banks use
  • Identifies the issuing country from the IBAN's two-letter prefix
  • Confirms the IBAN's length matches the expected length for its country
  • Displays the IBAN formatted into readable four-character blocks
  • Supports checking with Enter as well as the Check button
  • Works entirely in your browser — nothing you enter is sent to a server
  • Free to use, with no sign-up and no limit on how many times you run it

Finance and accounting teams

Finance and accounting teams use the IBAN Validator for catching a mistyped IBAN before sending a payment instruction.

Developers

Developers building payment or banking features use the IBAN Validator for checking their own validation logic and for testing edge cases.

Customer support

Customer support teams use the IBAN Validator for quickly confirming a customer-provided IBAN is well-formed before escalating a payment issue.

Students learning banking systems

Students learning banking systems use the IBAN Validator for seeing how the mod-97 checksum and country codes fit together.

Examples

IBAN Validator examples

3 worked examples

01

Valid German IBAN

Enter DE89 3704 0044 0532 0130 00 to see it marked Valid, with Country: Germany (DE) and a length of 22 characters.

02

Invalid checksum

Change the last digit to get DE89 3704 0044 0532 0130 01, and it's marked Invalid since it fails the mod-97 check.

03

Formatted UK IBAN

Enter GB29NWBK60161331926819 without spaces and it's displayed formatted as GB29 NWBK 6016 1331 9268 19, in readable blocks of four.

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FAQ

Frequently asked questions

Quick answers to common questions about the IBAN Validator.

What does the IBAN Validator do?

It checks whether an IBAN passes its checksum, identifies its country, confirms its length, and shows it formatted into readable blocks.

Is the IBAN Validator free to use?

Yes. It's free, with no sign-up, no watermark and no limit on how many times you use it.

Is my IBAN safe when I use this tool?

Yes. Validation happens entirely on your own device — nothing you enter is sent to a server.

What is the mod-97 checksum?

It's the mathematical check built into every IBAN: the country code and check digits are rearranged, letters are converted to numbers, and the result must leave a remainder of exactly 1 when divided by 97. Banks use this same check to catch typos before processing a transfer.

Does a valid checksum mean the account actually exists?

No. It only confirms the IBAN is well-formed and internally consistent — it can't confirm the account is real, open, or belongs to a specific person.

What happens if I enter an unrecognized country code?

The tool still runs the mod-97 checksum, but can't confirm the expected length for that country, since the check is against a known list of country formats.

Does it matter if I include spaces in the IBAN?

No. The tool strips spaces automatically, so you can paste an IBAN exactly as it's commonly displayed, grouped in blocks of four.

Can I use this tool on my phone?

Yes. The page is fully responsive and works on mobile, tablet and desktop browsers alike.

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