Fake Credit Card Generator
Generate valid-format test credit card numbers with Luhn validation for payment form testing
About Fake Credit Card Generator
This tool generates synthetic credit card numbers that pass Luhn algorithm validation using test-only BIN prefixes. The numbers are designed for developers and QA engineers who need to test payment form logic, field validation, and card type detection without using real card data.
How the Luhn Algorithm Works
The Luhn algorithm (also known as the "modulus 10" algorithm) is a simple checksum formula that validates identification numbers. For credit cards, it works by:
- Starting from the rightmost digit, double every second digit.
- If doubling results in a number greater than 9, subtract 9.
- Sum all the digits.
- If the total modulo 10 equals 0, the number is valid.
Every card number generated by this tool passes Luhn validation, making them indistinguishable from real card numbers in format-checking logic.
Why Use Test Card Numbers?
- Validate payment form input masks and formatting
- Test client-side Luhn validation implementations
- Verify card type detection (Visa vs Amex vs Mastercard)
- Generate bulk test data for automated testing suites
- Avoid compliance risks from using real card numbers in test environments
Supported Card Types
Each card type uses a synthetic BIN prefix reserved for testing:
- Visa — 16 digits, prefix 4000 00, 3-digit CVV
- Mastercard — 16 digits, prefix 5100 00, 3-digit CVV
- American Express — 15 digits, prefix 3400 00, 4-digit CVV
- Discover — 16 digits, prefix 6011 00, 3-digit CVV
Examples
Sample generated output (with CVV and expiry enabled):
4000001234567899 | CVV: 421 | Exp: 08/27
5100004567890123 | CVV: 739 | Exp: 11/28
3400005678901234 | CVV: 5012 | Exp: 03/26Frequently Asked Questions
Are these credit card numbers real?
No. This tool generates synthetic card numbers using test-only BIN prefixes that do not belong to any real financial institution. The numbers pass Luhn validation for format testing purposes, but they cannot be used for actual transactions.
What is the Luhn algorithm?
The Luhn algorithm is a checksum formula used to validate identification numbers including credit card numbers. It detects single-digit errors and adjacent transposition errors. Every generated card number passes this check, making them suitable for testing payment form validation logic.
Can I use these numbers for testing payment integrations?
These numbers are useful for testing client-side form validation (format checks, Luhn validation, card type detection). For end-to-end payment gateway testing, use your payment provider's official test card numbers (e.g., Stripe's 4242 4242 4242 4242) as they are recognized by the gateway sandbox.
Why do American Express cards have different formats?
American Express cards use 15 digits (vs 16 for Visa/Mastercard/Discover) and a 4-digit CVV (vs 3 digits). This tool correctly generates Amex cards with these specifications, allowing you to test that your payment forms handle varying card formats properly.