Support Guides

Banking & Payment Guides

Learn how IBAN, routing numbers, and card validation work — clearly and simply.

IBAN

IBAN Guides

Everything you need to know about International Bank Account Numbers — structure, validation, country formats, and how they compare to SWIFT and card numbers.

Cartão

Card Number Guides

How payment card numbers are structured, validated, and used — from BIN prefixes and brand detection to the Luhn algorithm and CVV.

Banco EUA

US Bank Transfer Guides

ABA routing numbers, account number formats, ACH payments, and wire transfers — the complete reference for US banking and fintech.

Try the Validators

Try the Validators

Put the knowledge into practice — run a live format check on any IBAN, card number, or US routing number.