IBAN Validator

Validate IBAN numbers using the Modulo 97 algorithm instantly in your browser

Spaces are ignored automatically

Sample valid IBANs for testing:

What is IBAN Validator?

The IBAN Validator checks whether an International Bank Account Number is valid using the official Modulo 97 algorithm, the same method used by banks worldwide. It supports IBAN numbers from 70+ countries, shows the country code, expected length, check digits, and formatted IBAN. All validation runs entirely in your browser — your banking details are never sent to any server.

Why Use DevBench IBAN Validator?

DevBench tools are built with one principle: everything runs in your browser. Unlike most online tools that upload your data to remote servers, DevBench processes everything locally using client-side JavaScript. This means your files, code, and sensitive data never leave your device. There are no accounts to create, no usage limits, no watermarks, and no paywalls. Every tool on DevBench is completely free to use as many times as you need. Whether you are a professional developer, a student learning to code, or someone who occasionally needs a quick utility, DevBench gives you instant access to powerful tools without friction.

How to Use IBAN Validator

Using the IBAN Validator is straightforward and requires no installation or sign-up. Follow these steps to get started:

  1. Enter the IBAN number in the input field (spaces are ignored automatically)
  2. The validation result appears instantly below the input
  3. Green banner means valid, red means invalid with the reason shown
  4. The stats cards show country, length, check digits, and formatted IBAN
  5. Click a sample IBAN button to test with a known valid number

All processing happens directly in your browser, so your data stays private and results are instant.

Examples

Here are some common examples of how the IBAN Validator is used in real-world scenarios:

  • Validate a UK IBAN: GB82 WEST 1234 5698 7654 32
  • Check a German IBAN: DE89 3704 0044 0532 0130 00
  • Validate a French IBAN: FR76 3000 6000 0112 3456 7890 189
  • Check a Spanish IBAN: ES91 2100 0418 4502 0005 1332
  • Validate an Italian IBAN for a bank transfer

Use Cases

The IBAN Validator is used by developers, designers, and professionals across many industries. Common use cases include:

  • Developers validating IBAN inputs in payment forms
  • Finance teams verifying bank account numbers before transfers
  • Accountants checking IBAN format for international payments
  • QA engineers testing IBAN validation in banking applications
  • Anyone verifying an IBAN before making a wire transfer
  • Data analysts cleaning IBAN fields in financial datasets
  • Developers building international payment integrations

Whether you are a beginner learning the basics or an experienced developer working on complex projects, this tool is designed to fit seamlessly into your workflow.

Frequently Asked Questions

Here are answers to the most common questions about the IBAN Validator:

What is an IBAN?

IBAN (International Bank Account Number) is a standardized format for identifying bank accounts internationally. It starts with a 2-letter country code, followed by 2 check digits, and then the domestic bank account number.

How does IBAN validation work?

IBAN validation uses the Modulo 97 algorithm. The first 4 characters are moved to the end, letters are converted to numbers (A=10, B=11, etc.), and the resulting number is divided by 97. A valid IBAN always gives a remainder of 1.

Does a valid IBAN mean the account exists?

No. IBAN validation only checks the mathematical format. A valid IBAN format does not guarantee the account exists or is active.

Is my IBAN sent to a server?

No. All validation runs entirely in your browser using JavaScript. Your IBAN is never transmitted to any server or stored anywhere.

Which countries use IBAN?

IBAN is used by most European countries, many Middle Eastern countries, and some others. The US, Canada, and Australia do not use IBAN.