UtilitiesFree · 3 uses/dayProcessed in your browser

Credit Card Validator

Name: Quorify — Online Tools Suite
Brand: Quorify

Check card numbers with the Luhn algorithm without sending any data.

Responsible use: This tool only checks the number's format (Luhn algorithm and card-network prefix) — it does not query banks or card networks. Use it only with cards you own or are authorized to validate.

Digits

—

Brand

—

Status

—

Security

On-device processing

Card number

Enter or paste the number

Privacy: The number you type stays only in your browser and is not included in any analytics event. Nothing is sent to Quorify's servers or to the card networks. It clears itself after 60 s of inactivity.

How the Luhn Algorithm Works

Checksum steps

Step 01

Reverse reading

Digits are read from right to left, starting with the check digit.

Step 02

Alternating doubling

Every second digit is multiplied by 2. If the result exceeds 9, subtract 9.

Step 03

Sum and modulo

All digits are summed. A valid number results in a sum divisible by 10.

Credit Card Validator