Fake IBAN Generator

Why Use a Synthetic IBAN for QA Testing?

Every synthetic IBAN generated here has the exact character length specified by its national banking authority and passes the ISO 7064 MOD 97-10 check-digit algorithm. This makes it perfect for developers, QA engineers, and database administrators testing form validations, payment gateway integrations, and mock database seeds without risking real financial data.

• 19 Supported Countries: Generate authentic account structures for UK, Germany, France, Spain, Italy, Netherlands, Belgium, Switzerland, Austria, Ireland, Poland, Portugal, Sweden, Norway, Denmark, Finland, Saudi Arabia, UAE, and Turkey.
• Bulk Generation: Generate batches of up to 50 IBANs simultaneously and export them directly to CSV, JSON, or TXT format.
• Integrated Checksum Validator: Test existing IBAN strings against mod-97 and length requirements directly in your browser.
• 100% Client-Side Privacy: All random generation and verification run locally via JavaScript. Zero network requests are sent.

How Our Generator Uses the MOD-97 Checksum

A genuinely useful fake IBAN for testing needs to pass the exact same validation logic real banking software applies. If a fake IBAN did not pass real validation logic, you would only test whether your application rejects invalid string formats rather than testing true end-to-end payment workflows. This tool implements the real IBAN check-digit standard (ISO 7064 MOD 97-10) rather than just stringing together random digits.

IBAN validation follows a four-step sequence. First, the two check digits and country code move from the front to the end of the string, with the check digits temporarily replaced by "00". Second, every letter in that rearranged string is converted to a number (A becomes 10, B becomes 11, up to Z as 35), turning the whole string into a single large integer. Third, that number is reduced modulo 97. Fourth, the real check digits are calculated as 98 minus that remainder, zero-padded to two digits. Our generator runs this math to ensure every produced IBAN passes strict validation checks.

Disclaimer: Not Real Bank Accounts

All IBAN numbers and bank records generated on this page are completely synthetic and generated on the fly in your browser. They do not correspond to any genuine banking institution, checking account, savings account, or real individual. These numbers are strictly intended for automated integration tests, manual QA checks, staging database seeds, and educational demonstrations. Using synthetic IBAN data for actual payments, transfers, or unlawful transactions is strictly forbidden.

International Banking Specifications & Length Reference

Why the modulo math needs BigInt

After converting letters to numbers, the resulting numeric string for a full IBAN can run to 30+ digits, far beyond JavaScript's safe integer range of about 9 quadrillion (2^53 - 1). Using regular JavaScript number division and modulo on a value that large would silently lose precision and produce an incorrect, invalid check digit. BigInt has no such ceiling, it performs exact integer arithmetic no matter how many digits are involved, which is essential here since even a single wrong digit in that calculation would produce an IBAN that fails validation instead of one that correctly passes it.

Why account number structure differs by country

The digits after the check digits, the BBAN (Basic Bank Account Number), aren't randomly formatted the same way for every country, because IBAN is built on top of each country's own pre-existing domestic account numbering scheme. Italy's BBAN structure requires a leading letter (a control character specific to Italian banking) followed by digits, and the Netherlands, UK, and Ireland start with 4-letter bank codes before the account digits, since their bank codes have traditionally been letters rather than numbers. This tool models those country-specific structural quirks rather than generating uniform random digits everywhere, which is part of why generated IBANs vary in total length from 15 characters (Norway) to 28 (Poland) depending on the country selected.

Testing Payment Gateways and Sandbox Environments

Integrating payment service providers such as Stripe, Adyen, Braintree, or PayPal requires extensive automated end-to-end testing across checkout flows, subscription renewals, direct debits (SEPA), and bank transfer payout pipelines. When creating automated test suites, engineering teams must observe several essential practices:

• SEPA Direct Debit Validation: Payment gateways validate IBAN inputs in two stages. First, client-side input validation runs the ISO 7064 MOD 97-10 check to immediately flag typos. Second, the gateway verifies whether the bank identifier code corresponds to an institution registered on the SEPA routing directory. Synthetic IBANs generated here satisfy both mathematical check-digit criteria and realistic country length rules.
• Handling Invalid Check-Digit Edge Cases: Comprehensive QA test suites must verify error handling by asserting that mutated check-digits or malformed country prefixes trigger immediate user-friendly validation warnings rather than unhandled gateway exceptions.
• Database Column Constraints: In relational database schemas (PostgreSQL, MySQL), IBAN columns should be defined as VARCHAR(34) to accommodate the longest official IBANs (such as Malta and Saint Lucia at 30 to 32 characters) while storing sanitized, space-stripped strings.