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💳 Credit Card Validator

Validate credit card numbers using Luhn algorithm

⚠️ Privacy Notice:

This tool validates card number format only using the Luhn algorithm. It does NOT store, transmit, or process any data. All validation happens locally in your browser. Never share real credit card information online.

About Luhn Algorithm

Card Number Patterns

📋 About This Tool

The Credit Card Validator uses the industry-standard Luhn algorithm (Mod 10) to verify credit card numbers instantly. This tool validates card numbers from major providers including Visa, MasterCard, American Express, Discover, Diners Club, and JCB. Perfect for developers testing payment systems, QA teams, or users verifying card number accuracy before transactions.

🎯 How to Use

  1. Enter Card Number: Type or paste the credit card number (16 digits for most cards, 15 for American Express)
  2. Spaces Optional: You can enter numbers with or without spaces - the tool handles both formats
  3. Click Validate: Press the "Validate Card" button to check the number
  4. Review Results: See instant validation status, card type identification, and Luhn check results
  5. Test Multiple Cards: Use the clear button to reset and test another card number

💡 Instructions

  • ✓ This tool validates mathematical correctness only - it doesn't check if a card is active or has funds
  • ✓ Never share real credit card details online - use test card numbers for development
  • ✓ Common test cards: Visa (4532015112830366), MasterCard (5425233430109903), Amex (374245455400126)
  • ✓ The Luhn algorithm checks the last digit (checksum) against other digits using a specific formula
  • ✓ All validation happens locally in your browser - no data is sent to any server