Card
Validator.
Paste a card number to check it against the Luhn algorithm and identify the brand from its BIN prefix. Nothing leaves your browser — this is structural validation only, not a real funds check.
The Luhn algorithm
Starting from the rightmost digit and moving left, double every second digit. If doubling produces a number greater than 9, subtract 9. Sum all the digits. If the total is a multiple of 10, the number passes Luhn.
What this proves. Luhn is a checksum, not authentication — it catches single-digit typos and most transpositions, but a number that passes Luhn isn't necessarily issued, active, or yours to charge.
Frequently asked questions
What does Credit Card Validator do?
Luhn-check and detect the brand of any card number. The whole thing runs in your browser tab, so it is ready the moment the page finishes loading.
Is Credit Card Validator free to use?
Yes. Credit Card Validator is completely free on ToolMunch — no trial, no premium tier holding back the main feature, and no daily or hourly cap on how many times you can use it.
Do I need to create an account or sign up?
No. There is no account, no email address, and no login. Open Credit Card Validator, do the job, and take the result — nothing is gated behind a signup form.
Is the text I paste in sent to a server?
No. Credit Card Validator runs entirely inside your browser tab, so the text you paste stays on your own device. Nothing is uploaded, which means there is no copy of it on a server to worry about.
Does Credit Card Validator work on Mac, Windows, and phones?
Yes. Credit Card Validator runs in any modern web browser on Windows, macOS, Linux, Chromebook, Android, and iOS. There is nothing to download or install.
Can I use it as many times as I want?
Yes. There is no queue, no per-hour quota, and no counter that runs out — run Credit Card Validator as often as the work needs.