Credit card number validator
Validate credit card numbers using the Luhn algorithm. Identifies the card network (Visa, Mastercard, Amex) from the prefix.
- Free, no sign-up
- No data stored
- Reviewed 2026-01-15
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About the Credit Card Validator
Validate credit or debit card numbers using the Luhn checksum algorithm. The tool also identifies the card network from the issuer identification number (IIN/BIN): Visa, Mastercard, Amex, Discover and others.
How to use the Credit Card Validator
- Enter a card number (spaces/dashes are stripped).
- View pass/fail Luhn result.
- See identified network and card length.
- For bulk: paste multiple numbers.
Frequently asked questions
Does this charge the card?
Absolutely not. This is a mathematical checksum only. No network connection to any payment processor is made.
What is the Luhn algorithm?
A simple checksum formula that detects single-digit errors and most transpositions. It does not confirm the card is active or has funds.
How is the network identified?
From the first 1–6 digits (IIN/BIN): Visa starts with 4, Mastercard 51–55 or 2221–2720, Amex 34/37, etc.