Credit Card Validator
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.