Validate credit card numbers using the Luhn algorithm. Automatically detects the brand.
Enter a card number to validate
How Validation Works
Luhn Algorithm (MOD 10)
The Luhn algorithm is a checksum formula used to validate credit card numbers. It detects typing errors and invalid numbers through a simple but effective mathematical calculation.
How to Validate
1. Enter the card number (without spaces or dashes)
2. Click 'Validate Card'
3. The system checks using the Luhn algorithm
4. Automatically identifies the card brand
5. Shows if the number is structurally valid
Use Cases
✓Check if a card number was entered correctly
✓Validate checkout forms before submission
✓Test card input masks
✓Payment system development
✓Automatically identify card brand
✓QA and testing of financial systems
⚠️ Important
This tool only validates the number structure using the Luhn algorithm. A valid number does not mean the card exists or is active. For real transactions, always use secure payment systems.