IBAN Validator

Bank account numbers in test fixtures are the easiest thing to fake and the easiest thing to get wrong - a single transposed digit passes a naive length check and then fails at the payment provider. This tool validates IBANs against the real ISO 13616 rules (length, national format, and the mod-97 checksum) for 89 countries, and generates structurally valid test IBANs when you need seed data that will not bounce.

• The checksum catches digit swaps and typos that a length check alone misses - use it to check data before it reaches a payment form.
• Generated test IBANs pass all structural rules but are not real accounts; keep them out of any live payment flow.
• Everything runs in the browser, so you can paste vendor or customer test data without sending it anywhere.

IBAN Validator checks international bank account numbers against the ISO 13616 standard: the two-letter country code, the national length, the per-country structure, and the ISO 7064 mod-97 checksum. It covers 89 countries with their official formats, and can also generate structurally valid test IBANs (correct length and checksum) for QA and payment-flow testing. Everything runs in the browser — the number never leaves the page.