Is the Luhn Algorithm tool free?

Yes, the Luhn Algorithm tool is completely free to use at NumbersChecker. No account or installation is needed — results are instant.

How do I use the Luhn Algorithm tool?

Enter your input into the form at https://numberschecker.com/tool/luhn, click Run, and the result appears instantly. Click any result value to copy it to your clipboard.

Is there an API for the Luhn Algorithm tool?

Yes. Send a POST request to https://numberschecker.com/api/luhn with your input as a JSON body. The API is free and requires no authentication.

Programming credit-cardchecksumvalidateluhn

Luhn Algorithm

Validate or generate a check digit using the Luhn algorithm (credit cards, IMEI, etc).

About the Luhn Algorithm Tool

Validate or generate a check digit using the Luhn algorithm (credit cards, IMEI, etc). This free online tool runs entirely in your browser — no login, no installation, and no data is stored.

This tool is part of the Programming category on NumbersChecker. Browse all Programming tools or explore all 139 tools.

Related: credit-card · checksum · validate · luhn

API usage

POST /api/luhn
Content-Type: application/json

{
  "text": "your input here"
}