Credit Card Validator
Verify whether a test credit card number complies with the ISO/IEC 7812 Modulo 10 Luhn algorithm, network prefix allocations, and length rules using client-side validation in your browser.
Synthetic cards are generated strictly for software engineering, user-interface validation, and automated QA tests. They are not issued by financial institutions, carry no credit balance, and are not intended or verified for live payment authorization.
What Does Card Validation Actually Check?
Major Industry & Scheme Prefix
The initial digits are evaluated to determine the card network (e.g. Visa starts with 4, Mastercard with 51-55 or 2221-2720, Amex with 34/37). Learn more in our BIN & IIN guide.
Network Length Rules
The validator checks the entered PAN against the supported network-length rules implemented by this tool, including Visa (16, 13, 19 digits), Mastercard (16 digits), American Express (15 digits), and UnionPay (16–19 digits).
ISO/IEC 7812 Checksum
The Luhn checksum helps detect many common digit-entry errors by validating the final check digit. It provides checksum validation only and does not catch every transposition error or verify cardholder accounts.
Frequently Asked Questions
How does client-side card validation work? ↓
Client-side validation inspects three distinct structural properties: the starting prefix to identify the card scheme (e.g. Visa starts with 4), the character length against network rules, and the final check digit via the Modulo 10 Luhn checksum algorithm.
Does this validator transmit my card number to a server? ↓
The validator logic runs locally in your browser and does not intentionally submit the entered card number to our application server. Use synthetic test data rather than real payment credentials.
Does structural validity mean a card is authorized for payment? ↓
No. Structural validity is not payment authorization. This validator checks only the card network/prefix pattern, PAN length, and the Modulo 10 Luhn checksum. It does not verify account existence, available balance, CVV authenticity, or card expiration and account status, and it does not contact an issuer or payment network. Passing these structural checks does not indicate that the number is authorized for live payment use.
Related Payment Testing Tools & Resources
Luhn Checker Tool
Inspect step-by-step arithmetic doubling, summation, and check digit calculations.
Safe BIN Checker
Inspect the 6–8 digit BIN/IIN prefix and identify supported card-network patterns.
Browser Card Generator
Need valid numbers to test? Synthesize test cards with valid Luhn checksums.