Card · Card

Luhn / Brand / Mask

Validate test PAN, detect brand, mask safely.

Luhn / Brand / Mask

Run local card number diagnostics without storing PAN.

Luhn valid

Input

Card number or test PANCVV is not accepted or needed.

Treat this as sensitive card data. This tool runs locally and never stores the full PAN.

This tool runs in the browser only. Full PAN is never persisted in localStorage.

Output

Check	Result
Brand	Visa
Luhn	Valid
Length	Expected length
Mask first 6 + last 4	411111******1111
Mask first 8 + last 4	41111111****1111

Safe diagnostic JSON

{
  "sanitized": "[not stored]",
  "brand": "Visa",
  "luhnValid": true,
  "lengthValid": true,
  "mask6": "411111******1111",
  "mask8": "41111111****1111",
  "warning": "Treat this as sensitive card data. This tool runs locally and never stores the full PAN."
}