IBAN Toolkit logoIBAN Toolkit

THE IBAN TOOLKIT LIBRARY

Understand the numbers.
Build with confidence.

Learn how to read bank identifiers, troubleshoot validation errors and test payment forms. Worked examples connect each guide to the tools.

Start with IBAN basics →

ONE IDENTIFIER. THREE PARTS.
DE893704 0044 0532 0130 00
COUNTRY · CHECK DIGITS · NATIONAL STRUCTURE
  • Understand each component
  • Follow a worked checksum calculation
  • Separate format checks from account verification

Documentation example. Do not use for payments.

VALIDATION illustration

How IBAN validation works

What a validator checks, and what it cannot verify.

Read guide MOD-97 illustration

IBAN check digits explained

Follow the MOD-97 calculation step by step.

Read guide COUNTRY FORMATS illustration

Which countries use IBAN?

Explore country formats and their differences.

Read guide DEVELOPER GUIDE illustration

Test payment forms with IBANs

Practical QA workflows and validation edge cases.

Read guide LENGTH REFERENCE illustration

IBAN length by country

A country-by-country length reference.

Read guide TROUBLESHOOTING illustration

Common IBAN errors

Troubleshoot formatting and checksum failures.

Read guide BBAN EXPLAINED illustration

What is a BBAN?

Understand the national account component.

Read guide IDENTIFIERS illustration

IBAN vs account number

Learn which identifier does what.

Read guide CHECK AN IBAN illustration

How to check an IBAN

Ways to check formatting and account details.

Read guide FIND YOUR IBAN illustration

How to find your IBAN

Where to look in your banking app or statement.

Read guide IBAN BASICS illustration

What is an IBAN?

Learn the structure of an international account identifier.

Read guide IBAN & BIC illustration

IBAN vs SWIFT/BIC

Understand account identifiers and bank codes.

Read guide

Know the limits. Format and checksum checks do not confirm account ownership or existence. Use your bank’s verification process for real payments.