Credit Card Validator
Validate credit card numbers using Luhn algorithm with card type detection—perfect for testing payment forms.
Enter Credit Card Number
Enter a credit card number to validate using the Luhn algorithm
Test Cards
Lengths: 13, 16, 19 digits
Starts with 4
Lengths: 16 digits
Starts with 5 or 2
Lengths: 15 digits
Starts with 34 or 37
Lengths: 16 digits
Starts with 6
Lengths: 14 digits
Starts with 30, 36, 38, 39
Lengths: 15, 16 digits
Starts with 2131, 1800, or 35
Lengths: 16, 17, 18, 19 digits
Starts with 62 or 88
Lengths: 12, 13, 14, 15, 16, 17, 18, 19 digits
Starts with 50, 56, 57, 58, or 6
Our Credit Card Validator verifies card numbers using the Luhn algorithm (mod-10 checksum) with automatic card type detection for 8 major networks (Visa, Mastercard, Amex, Discover, Diners, JCB, UnionPay, Maestro). Features test card quick-load buttons, visual validation results with green/red indicators, formatted display, and security info—ideal for developers testing payment forms, e-commerce sites validating input, or anyone learning about card number structure and checksums.
Frequently Asked Questions
What is the Luhn algorithm?
The Luhn algorithm (mod-10 checksum) validates card numbers by doubling every second digit from right to left, subtracting 9 if >9, summing all digits, and checking if divisible by 10. Created by Hans Peter Luhn in 1954, it catches 100% of single-digit errors and 98% of transpositions—used by all major card networks.
Is this tool safe for real card numbers?
Yes, but use caution! All validation runs client-side in your browser—no data is sent to servers or stored. However, avoid entering real card numbers on public/shared computers. This tool is designed for testing payment forms with test cards, not verifying active accounts.
What card types are supported?
Visa (4xxx, 13-19 digits), Mastercard (5xxx/2xxx, 16 digits), American Express (34xx/37xx, 15 digits), Discover (6xxx, 16 digits), Diners Club (30xx/36xx/38xx, 14 digits), JCB (35xx, 15-16 digits), UnionPay (62xx/88xx, 16-19 digits), Maestro (5xxx/6xxx, 12-19 digits). Detection uses BIN patterns and length validation.
Where can I get test card numbers?
Use our test card buttons for valid numbers: Visa 4111111111111111, Mastercard 5555555555554444, Amex 378282246310005. These pass Luhn but aren't real accounts—safe for payment gateway testing. Stripe, PayPal, and other processors provide official test cards in their docs.
Why does a valid card fail validation?
Common causes: spaces/dashes not removed (tool auto-formats), wrong length for card type (Amex needs 15, Visa 13-19), or typo in number. If a real card fails, verify you entered all digits correctly. The Luhn algorithm is deterministic—same input always gives same result.
Can I use this for PCI compliance?
No! This tool validates format only, not account status, expiry, or CVV. PCI compliance requires secure payment processors (Stripe, Braintree) with tokenization and encryption. Use this for frontend validation before sending to processors—never store real card data yourself.