Hello everyone. We will have an announcement. Mytoolz.net comes with a new system. In addition, dark mode will be added to the theme. It may take a long time to completely finish and integrate. Tell us your feedback. Have fun.

We Will Remove the account register and login system from mytoolz, and all the tools will be for free use we will add new tools very soon, was busy due to personal life, but soon we're getting back on it. Thank You:)

**Fixed:** **Free CC Checker - Credit Card Checker**.

We Will Remove the account register and login system from mytoolz, and all the tools will be for free use we will add new tools very soon, was busy due to personal life, but soon we're getting back on it. Thank You:)

The Luhn algorithm is an algorithm developed by Hans Peter Luhn and IBM in 1954. It is also called Luhn Check and Mod Check.

**Luhn algorithm is used in 2 ways.**

**Check digit calculator**

Check digit value is a value calculated according to mode 10 over the sum of external check digit values. **The algorithm is as follows:**

The rightmost digit is the check digit value.

Starting from the check digit value, we multiply the 1st, 3rd, 5… .. values by 2. (2., 4., 6.… values remain the same.)

If the sum of the values is greater than 9, we add up the numbers and find the sum of the numbers.

All the resulting figures are added together.

The sum of the numbers is multiplied by 9.

The last digit of the obtained digit is the check digit value.