Credit Card Formatter
Format and validate credit card numbers
Frequently Asked Questions
How does credit card validation work?
This tool uses the Luhn algorithm to validate credit card numbers. This mathematical formula checks if the number has the correct format, but doesn't verify if the card is actually active or belongs to a real account.
What card types are supported?
The tool identifies common card types: Visa (starting with 4), Mastercard (starting with 51-55), American Express (starting with 34 or 37), and Discover (starting with 6011 or 65).
Is my credit card information secure?
Absolutely. All processing happens directly in your browser - no data is transmitted to any server. Your card information remains completely private and secure.
Can this tool be used fraudulently?
No, this tool only validates the mathematical correctness of a number using the Luhn algorithm. It doesn't verify real accounts or enable fraudulent activities. Valid numbers generated may not correspond to actual cards.