You can test all keys like Function keys, Control keys, etc., of a keyboard of your Windows computer using a free Keyboard Tester software.

Is your external or laptop keyboard exhibiting problems? These online keyboard testers can help test your keyboard and identify issues so you can troubleshoot them easily.

If you want to test if your Keyboard is working fine or not, use a free online Keyboard Checker & Testerl tool. This Keyboard test utility works!

To test the rollover number, press three, then four and then five keys simultaneously. If they all display on screen, the keyboard has rollover for that number of keys.