Question 1

Are these real card numbers?

Accepted Answer

No. These are Luhn-valid virtual numbers for development testing only. They cannot be used for real transactions and are not linked to any bank account.

Question 2

What is the Luhn algorithm?

Accepted Answer

Luhn algorithm (Mod 10) is a simple checksum formula used to validate credit card numbers, IMEI numbers, and other identifiers. Most card issuers use it to prevent input errors.

Question 3

Is my data uploaded to a server?

Accepted Answer

No. All generation happens locally in your browser. No card numbers are ever stored or transmitted.

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