The programs below are free! They are online at lockcodes.com.

Enter the change, master, and control keys for Small Format interchangeable core and this tells you how to pin the cylinder. It works with multiple masters and even multiple control keys.

For a conventional cylinder of up to 7 pins, this will calculate how many operating keys are available to the manufacturer, when using various MACS.

We've compiled a list of lock and product names and key blanks that are used on them. When you come across a name that's unfamiliar to you, check here to see what type keys it uses.