Luhn Number Validator
Utility ToolsValidate numbers with the Luhn algorithm
Embed this tool on your websiteFree
- Choose how tall the frame should be.
- Press Copy code.
- Paste it into your page, blog, WordPress or Notion HTML block.
The tool runs inside your visitor's browser, nothing is uploaded, and a small "Powered by ToolCloak" line stays under it. The second line (script) is optional: it makes the frame fit the tool's height.
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History
All history →Luhn Number Validator — at a glance
Find out if a number has a correct check digit using the Luhn formula.
How to use it — step by step
A number made of digits. Spaces and dashes are ignored. Use test numbers only.
Paste your input
Paste or type your content into the big input box.
Check Number
Press the button. The result is created instantly on your device.
Copy the result
Check the output and press Copy to use it anywhere.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
Does a valid result mean the card works?+
No. It only means the digits follow the checksum rule. It says nothing about balance, expiry or whether the card is real.
Is it safe?+
The check runs inside your browser and nothing is sent anywhere. Still, prefer sample numbers.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.