Finance
Credit Card Luhn Validator
Check whether a payment card number satisfies the Luhn algorithm and identify a likely brand from the prefix. This does not verify account existence.
Features
- Processes input on the Go server and returns a server-rendered result.
- Uses a focused tool page with readable explanatory content.
- Returns output in a copy-friendly text format.
Use Cases
- Debug API payloads and copied data.
- Prepare examples for documentation or tests.
- Clean up small pieces of text without opening a larger application.
Examples
Sample input
4111 1111 1111 1111
Submit the form to generate output.
FAQ
Is this page server-rendered?
Yes. The tool page and result are rendered by Go, so the page remains accessible and indexable.
Should I paste sensitive data?
Avoid pasting secrets, private keys, passwords, or sensitive personal data into online tools.