Test/Fake Credit Card Number Generator & Validator

Generate Luhn-valid test credit card numbers for Visa, Mastercard, Amex, Discover, JCB, and Diners Club, and validate any card number's checksum and format.

Mathematical Audit

How Test Card Numbers Are Generated & Validated

Real-looking card numbers follow a structure defined by the ISO/IEC 7812 standard: an Issuer Identification Number (IIN) prefix identifies the network (e.g., Visa numbers start with 4), followed by an account number, with the final digit acting as a checksum computed using the Luhn algorithm.

For each digit from right to left, double every second digit (starting with the second-to-last)
If doubling a digit produces a number greater than 9, subtract 9 from it
Sum all digits (doubled and unchanged)
Valid number: total sum is evenly divisible by 10 (sum mod 10 = 0)
Generated check digit = (10 − (sum of all other digits mod 10)) mod 10

These generated numbers are mathematically valid (they pass the Luhn checksum and use real issuer prefixes/lengths) but are not linked to any real account, bank, or funds. They are intended only for testing forms, validation logic, and sandbox payment integrations.

Operational Guide

How to Use the Fake Credit Card Generator

1

Choose a card network

Select Visa, Mastercard, American Express, Discover, JCB, or Diners Club to generate numbers matching that network's prefix and length rules.

2

Set the quantity

Choose how many test numbers to generate at once (up to 50).

3

Include CVV and expiry (optional)

Toggle this on to also generate a matching random CVV code and a future expiry date for each card.

4

Click Generate

Instantly produce a list of Luhn-valid test card numbers you can copy into a sandbox checkout form.

5

Validate an existing number

Paste any card number into the validator field to check whether it passes the Luhn checksum and which network it likely belongs to, based on its prefix and length.

Real-World Scenario Example

"A developer needs five Visa test numbers with CVV and expiry dates to test a checkout form, and wants to confirm that the well-known Stripe test number 4242 4242 4242 4242 is Luhn-valid."

Inputs

cardNetwork:visa
quantity:5
includeCvvAndExpiry:true
validateNumber:4242424242424242

Result

The generator returns 5 Visa-format numbers (starting with 4, 16 digits) each with a 3-digit CVV and a future MM/YY expiry. The validator confirms 4242 4242 4242 4242 passes the Luhn checksum, is 16 digits long, and matches the Visa prefix pattern.

Important Disclaimer

This tool generates and validates numbers for software testing and educational purposes only. Generated numbers are not real payment instruments and cannot be used for purchases. Do not enter real card numbers from yourself or others into this or any untrusted tool.

Internal Linking

Related Calculators

Finance & Web3

Credit Card Payoff & Interest Calculator

Find out how long it will take to pay off your credit card balance, how much interest you'll pay, and how much you'll save versus making minimum payments.

Open Utility
Finance & Web3

Mortgage Payoff Calculator

Estimate how much faster you can pay off your mortgage and how much interest you'll save with extra monthly or one-time payments toward principal.

Open Utility
Gig & Side Hustle

Digital Product Pricing Tool

Calculate the optimal price for ebooks, templates, presets, courses, and other digital products based on your production costs, target margin, and perceived value.

Open Utility