Validate Credit Card Number
Enter a card-number string to inspect its declared format rules and Luhn checksum without sending it anywhere.
A QUICK WALKTHROUGH
How to use this tool
- Enter digits with optional spaces or hyphens.
- Run the local format, length, prefix, and Luhn checks.
- Read the mathematical result and its limitations.
Format and math only
This tool checks only the entered digits, supported length and prefix patterns, and the Luhn checksum. A passing result does not prove that a card exists, is issued, is active, is usable, is chargeable, or has funds.
Local and ephemeral
Processing happens in this browser only. The number is not uploaded, recorded, persisted, or logged by this tool.
GOOD TO KNOW
Common questions
Does a pass mean the card is real or usable?
No. It means only that the entered string matches the displayed format rules and Luhn checksum. It does not verify a card, account, transaction, or funds.
Which rules are checked?
The tool checks digits after removing spaces and hyphens, common network length and prefix patterns, and the Luhn checksum.
Is the number sent anywhere?
No. The check runs locally in your browser and does not upload, store, record, or log the input.