About Credit Card Validator Tool
Published: Last Updated:
This Credit Card Validator checks whether a card number passes the Luhn algorithm validation — the structural checksum used by all major card networks. It also auto-detects the card type (Visa, Mastercard, Amex, Discover, JCB) from the number prefix. Note: Luhn validation does not confirm if a card is active or has available credit.
Key Features
- Luhn algorithm validation.
- Auto-detects card type from number prefix.
- Runs entirely in your browser — no card number is sent anywhere.
- Handles formatted numbers with spaces or dashes.
How to Use the Tool
- Enter or paste a credit card number.
- The tool immediately checks the Luhn algorithm and identifies the card type.
- The validation result shows VALID or INVALID.
Core Benefits
- Quickly verify whether a card number was entered correctly (catches typos).
- Test whether your own card validation logic is working correctly.
- Learn about the Luhn algorithm for developer education.
Common Use Cases
- Verifying that a manually typed card number does not have a typo.
- Testing credit card field validation on a web form.
- Learning how card number validation works.
Pro Tips
- Luhn validity does not mean the card is active, not expired, or has available funds — only a payment processor can check those.
- Visa numbers start with 4. Mastercard: 51–55. Amex: 34 or 37. Discover: 60.
Use this free Credit Card Validator tool on GoodToolIt — no sign-up, no installation, works instantly in any browser.