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Bulk Card Number Validator

Validate a list of card numbers at once: network, length and Luhn, one per line.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Checks the format only: Luhn checksum, length and the network’s number range. It cannot tell whether a card is real, active or has funds, and nothing is sent anywhere.

How to use it (step by step)

  1. 1Type or paste your text into the “Card numbers (one per line)” box. There is already an example in it so you can see how it works; press Clear to start with your own.
  2. 2The answer appears right away in the “Results (masked)” box. No button needed.
  3. 3Press Copy and paste the result wherever you need it.

Words to know

Luhn check
A quick math test every real card number passes, like a spelling check for numbers. Passing it only means the number is typed in the right shape, not that the card is real.
Array / list
An ordered collection of items, like ["apple", "banana"]. Every programming language has one.
Hash / fingerprint (SHA-256)
A short code calculated from a file or text. Change even one letter and the code becomes completely different, so it proves nothing was altered.
Page range
A way to choose pages: 1-3 means pages 1 to 3; 5 means only page 5; 7- means page 7 to the end.

More in Cards & Payments

Interchange++ Fee CalculatorBreak a card fee into interchange, scheme fee and acquirer markup (IC++ pricing).Effective Processing Rate CalculatorYour real card-processing cost: total fees ÷ total card volume from your statement.Chargeback Ratio CalculatorYour dispute/chargeback ratio and how many more you can have before hitting a threshold.Payment Approval Rate CalculatorAuthorization approval and decline rates, and revenue lost to declines.Refund Cost CalculatorWhat a refund costs you when the original card fee is not returned.Card Minimum Purchase CalculatorThe smallest sale where the card fee stays under your chosen percentage.