Credit Card Validator
Batch validate multiple credit card numbers at once. Identify card type, check Luhn algorithm, and verify format for Visa, Mastercard, Amex and 20+ card types.
How does batch credit card validation work?
Enter multiple card numbers (one per line) and the validator checks each using the Luhn algorithm. It identifies the card type, verifies length, and splits results into valid and invalid cards.
What is the Luhn algorithm?
The Luhn algorithm is a simple checksum formula used to validate identification numbers. It works by summing digits with every second digit doubled, then checking if the total is divisible by 10.
Which card types are supported?
The validator supports 20+ card types including Visa, Mastercard, American Express, Discover, Diners Club, JCB, UnionPay, RuPay, Mir, Elo, Hipercard, Maestro, and more.
Is it safe to enter my card numbers?
All processing happens locally in your browser. No data is sent to any server. However, we recommend using test numbers only for security.
What does a valid card number mean?
A valid card number passes the Luhn algorithm check, meaning it has the correct format and checksum. However, this doesn't guarantee the card is active or has funds.
Can this validator check if a card is stolen?
No, this validator only checks the mathematical validity of card numbers. It cannot verify if a card is active, stolen, or has available credit.
Why are some card numbers invalid?
Card numbers may be invalid due to incorrect length, wrong checksum digit, or format that doesn't match any known card type. Typos during entry are also common.
Does this work for debit cards?
Yes, the validator works for both credit and debit cards as long as they follow standard card number formats (16-19 digits typically).
What are test card numbers?
Test card numbers are fake numbers used for development and testing. They pass validation but cannot be used for real transactions. Examples include 4111111111111111 for Visa.
How many cards can I validate at once?
There's no hard limit. You can paste hundreds of card numbers and the validator will process them all instantly in your browser.
How to Use Credit Card Validator
Batch-validate credit card numbers right in your browser: the tool identifies the card brand, runs the Luhn check and verifies the format for Visa, Mastercard, Amex and 20+ other types. No number is ever uploaded.
- Paste one or more card numbers into the input field — use the sample pattern shown by the placeholder, with one number per line for batches.
- Each number is checked instantly: you see the detected card type, the Luhn checksum result and any format errors.
- Turn on Auto-format to group the digits in blocks of four so long numbers are easier to read and proofread.
- Fix every number flagged as invalid — a single mistyped digit usually fails the Luhn check — then recheck the list.
A valid result only means the number is well-formed; it never proves that the card is real or still active.
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