💳 Credit Card Format Validator
Checks a card number's Luhn checksum and network prefix/length. Does not check anything else.
This checks number FORMAT only (the Luhn checksum and issuer prefix) — it does not verify the card is real, active, or belongs to anyone. Never enter a real card number into this or any similar tool. Use the built-in "generate a valid test number" feature below instead.
1. Generate a fake test number
Produces a Luhn-valid number with a real network's prefix shape, for testing this validator. It is not tied to any real account and cannot be used for any real transaction.
2. Check a number's format
3. Result
| Luhn checksum | — |
|---|---|
| Detected network | — |
| Digit count | — |
| Length matches network? | — |
| Overall | — |