What is Credit Card Validator?
This credit card validator checks card numbers against the Luhn algorithm — the international checksum standard used by payment networks — and automatically detects the card brand from the prefix: 4 for Visa, 5 for Mastercard, 3 for American Express or JCB, 62 for UnionPay. Paste one number or a whole batch (one per line) and instantly see validity, digit count, BIN (first 6 digits), and Luhn status for each card. Everything runs locally in your browser — no card data is ever uploaded.
▶Use Cases5 scenarios
- ◆Testing payment forms during development
- ◆Catching typos before checkout
- ◆Learning how the Luhn checksum works
- ◆Identifying card brand from a number
- ◆Validating batches of test data
▶How to Use4 steps
- 1Paste card number(s), one per line
- 2Click Validate
- 3Review validity, brand, and Luhn status per card
- 4Try the sample chips for instant demos
▶Features8 features
- ✓Free
- ✓No signup
- ✓Luhn checksum validation
- ✓Auto brand detection
- ✓Batch validation
- ✓BIN analysis
- ✓100% in-browser
- ✓Works on mobile
▶FAQ5 questions
What is the Luhn algorithm?
The Luhn algorithm (mod 10) is a simple checksum formula used to validate identification numbers such as credit card numbers. Digits are weighted from right to left and the total must be divisible by 10.
Is my card number uploaded?
No. Everything runs locally in your browser. Card numbers never leave your device.
Which brands are detected?
Visa (starts with 4), Mastercard (51-55, 22-27), American Express (34/37), Discover, JCB, UnionPay (62), and Diners Club.
Can I validate multiple cards at once?
Yes. Put one card number per line and validate them all together.
Does validation mean the card works?
No. The tool only checks format validity. It does not confirm the card is active or has funds, and it must not be used for illegal purposes.