How to use Credit Card Validator

What it does

Verify credit card numbers using the Luhn algorithm. 100% client-side safe. It runs entirely in your browser — your input never leaves your device.

Options

Every setting this tool exposes, straight from the code that validates it.

Worked example

Run these settings on the tool page:

• text: hello

You get:

[INVALID] hello (Contains non-digits)
--------------------------------------------------
Summary: 0 valid, 1 invalid (Out of 1 total)
*Note: This only verifies the mathematical checksum (Luhn). It does not verify if the card is active or has funds. No data is stored.*

Troubleshooting

• Nothing happens / the output stays empty. text is required — the tool waits until you provide it.
• It is slow on very large input. Everything runs in your browser, so speed depends on your device. Very large inputs are best split up, or run through the API where the work happens on our servers.

Automating it

The same logic is available as a REST endpoint, so you can run it from a script, a CI job or your own app.

Bash
curl "https://api.toolsxpo.com/v1/credit-card-validator" \
  -H "Authorization: Bearer $TOOLSXPO_KEY"

It costs 1 credit per successful call. See the full endpoint reference, or try it in the playground.

Related tools

• Email Validator
• Regex Validator
• SemVer Checker
• URL Validator
• XML Validator
• XSS Payload Auditor