Card Validator

To use prepostseo Card Validator, Paste card no in the given input box below and click on validate credit card button.


Check your credit card number

  • Visa
  • Mastercard
  • American Express
  • Discover
  • JCB
  • Diners Club

Example credit card numbers

Credit Card Type Credit Card Number
American Express 371449635398431
Diners Club 30569309025904
Discover 6011111111111117
JCB 3530111333300000
MasterCard 5555555555554444
Visa 4111111111111111

Passed Validation Failed

Luhn Algorithm Check

We'll check your number against the Luhn Algorithm to see if it is a valid credit card number.

Major Industry Identifier

The first digit of a credit card number represent the category of entity which issued the card.

Issuer identification number

The first six digits of a card number identify the institution that issued the card to the card holder.

Personal Account Number

igits 7 to final number minus 1 (the last is the checksum) indicate the individual account identifier.


Credit Card Validator

Credit card numbers are generated according to certain rules. It gives merchants a way to verify the validity of a card number before accepting the customer's payment.

The calculation to compare a credit card number with your checksum is known as the Luhn algorithm.

You can also save time by using the Prepostseo online credit card validator which performs the checksum calculations for you.

How to Perform Manual Card Validation?

  • First step

Enter the last digit of the credit card number. This is the digit of the checksum you will use to verify the rest of the credit card number.

  • Second step

Enter each digit of the credit card number, starting with the digit to the left of the checksum and moving to the left. If the credit card number has 16 digits, double the amount of each digit in the odd places, working from right to left, before adding it to your list.

In the case of credit cards with 15 digits, it would duplicate the digits in the points of uniform position. If you double the results of digits in a number greater than 10, add the two digits of the new number together and write that result into your list.

For example, if the digit on the card is seven, duplicating it would result in 14. The total of the two digits would then be five.

  • Third Step:

Totalize your list of numbers. Do not include the checksum digit in your total. If the total can be divided by 10, the credit card has a valid number. Otherwise, you shouldn't process credit card transactions.

How To Do Online validation with credit card checker?

  • First Step

Visit Prepostseo.com to use online credit card checker service. Investigate the scope of verification that our website provides.

Please note that with our credit card verifier tool you will only receive confirmation that the number of the card is valid, not credit on the card.

  • Second Step

Wait for the validation information of the card validator tool. If it is determined that the credit card is not valid, inform the customer that he can not process the transaction.

The importance of credit card validation

It is important to keep in mind that whenever fraudulent cards are used, the merchant loses. The customer of a stolen credit card is not hooked, and the credit card companies are generally not affected.

However, the merchant generally stays away from the product or service provided, as well as the resources necessary to discover the fraud and fight against the credit card company. And if too many fraudulent transactions occur, you may incur higher processing fees, expensive chargebacks, or even losing your merchant account and your ability to do business.

But you can mitigate these risks with the help of a little automation, and we can help you! Simply use our online card validator tool and our tool help you to combat fraud and maximize the sales of your credit cards.

Tips for credit card and PIN security

  • Sign your card as soon as you receive it.
  • Save your card as if it were cash.
  • Memorize your PIN. Never write it down
  • Be sure to receive your card from the vendor or waiter when you use it.
  • Shred the receipts that contain the full account number if you do not need to keep them.
  • Review your account statements as soon as you receive them to make sure all transactions are yours.
  • Make a list of your credit card numbers and customer service phone numbers and keep it in a closed place. If your purse or wallet is lost or stolen, this will make it easier for you to call to cancel the cards.

How many digits are in a Credit Card Number?

  • Visa and Visa Electron: 13 or 16
  • Mastercard: 16
  • Discover: 16
  • American Express: 15
  • Diner's Club: 14 (including enRoute, International, Blanche)
  • Maestro: 12 to 19 (multi-national Debit Card)
  • Laser: 16 to 19 (Ireland Debit Card)
  • Switch: 16, 18 or 19 (United Kingdom Debit Card)
  • Solo: 16, 18 or 19 (United Kingdom Debit Card)
  • JCB: 15 or 16 (Japan Credit Bureau)
  • China UnionPay: 16 (People's Republic of China)

Frequently Asked Questions

Is it safe to use Prepostseo online credit card verification tool?


Our validator only checks the main industry identifier or MII, the personal account number, and the issuer identification number.

Is there any risk in using an online credit card validator tool?

There is no risk and this service is safe to use, for sure. The only risk is that someone is literally looking at the screen while using the tool.

We can not and will not access any of the information you insert on the website, including your credit card number. All calculations are made in your browser so that your credit card number remains secure with you.

If you have a technical inclination, you can look behind the scenes and make sure that you are not making contact with our server, that you are not setting up cookies, that local storage is not being used. If you have no technical inclination, politely ask a friend who is, and be sure!

Do we keep these credit card numbers?

Absolutely not! The credit card number entered in our validator was made using the validation rules. However, we do not store these credit cars for security reasons.

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