credit card validator

Validate any credit card number using the Luhn algorithm and automatically detect the card network.

Credit Card Validator is a free online tool that checks whether a credit card number passes the Luhn checksum (mod 10 algorithm), which is the industry-standard method used by all major card networks to detect typos and invalid numbers. It also identifies the card type — Visa, Mastercard, American Express, Discover, JCB, or Diners Club — based on the number's prefix pattern.

This tool is useful for developers building payment forms, QA testers validating checkout flows, and anyone who needs to verify whether a card number is structurally valid before submitting it to a payment processor. It checks mathematical validity only — it does not verify whether the card is active, funded, or associated with a real account.

All validation is performed entirely in your browser using standard JavaScript. No card numbers are transmitted, stored, or logged on any server. Your data never leaves your device, making this tool completely safe to use with test card numbers during development.

With instant results, card type detection, and a clean interface, this tool provides the simplest way to validate credit card numbers online. No registration, no downloads — just reliable card validation on any device.