Credit Card Validator
Validate credit card numbers using the Luhn algorithm. Detects card type (Visa, Mastercard, Amex, etc.) and checks validity.
Enter digits only — spaces are added automatically
Example test numbers
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How to Use This Tool
Type or paste a credit card number. The tool automatically detects the card network (Visa, Mastercard, Amex, etc.) using BIN prefix rules and validates the number using the Luhn algorithm.
Common Use Cases
- Validate test card numbers during payment integration development
- Verify that a card number follows the correct format before submission
- Learn how the Luhn algorithm works with live examples
Frequently Asked Questions
How does credit card validation work?
The Luhn algorithm checks if a card number has a valid checksum. It doubles every second digit from the right, sums all digits, and verifies the total is divisible by 10.
Does passing validation mean the card is real?
No. The Luhn check only validates the number format and checksum. It cannot verify whether the card account actually exists, is active, or has sufficient funds.
Is my data sent to a server?
No. All validation happens in your browser using the Luhn algorithm. Your card number never leaves your machine.