Credit Card Validator
Instantly validate credit card numbers using the Luhn Algorithm. Detect card brand, format, and learn how validation works. Secure and runs entirely in your browser.
This tool is for format and checksum validation only. It does not check if a card is active or process payments. No data is stored or transmitted.
Luhn Checksum
Pending
Card Brand
Unknown
Card Length
-
IIN / BIN
-
Luhn Algorithm Breakdown
The Luhn algorithm validates various identification numbers. Watch how it works on your input in real-time below.
Waiting for input...
Test Card Numbers
Frequently Asked Questions
1. What is the Luhn algorithm?
The Luhn algorithm, also known as the "modulus 10" or "mod 10" algorithm, is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, and more. It helps detect accidental errors like mistyping a digit.
2. Is this tool safe to use?
Yes. This tool runs completely on the client-side (in your browser using JavaScript). We do not send your credit card number to any server, nor do we store or track it. However, as a best practice, never enter your real, active credit card number into random online tools. Use it primarily for testing, development, and educational purposes.
3. How are credit card numbers validated?
The validation process involves several steps: checking if the card number contains only numeric characters, verifying the length matches the card issuer's standards, matching the first few digits (IIN/BIN) to known card brands (like Visa or Mastercard), and finally passing the number through the Luhn algorithm to ensure the checksum digit is correct.
4. Can this tool process real payments?
No. This tool is strictly a format checker. It only verifies if the number conforms to the mathematical rules of credit card numbers. It cannot tell if a card is active, has funds, or who the owner is. Real payment processing requires a secure gateway connecting to banking networks.
5. What is an IIN or BIN number?
IIN (Issuer Identification Number) or BIN (Bank Identification Number) refers to the first 6 to 8 digits of a payment card number. These digits identify the institution that issued the card (like Chase, Bank of America, etc.) and the card brand (Visa, Mastercard).