Keyboard Tester This is a useful tool that easily check your keyboard without any charge and you can't use keyboard checker. In Keyboard Tester, you can check all your keys individually and there are no limits. You can check the board as many times as you want. Keyboard Tester is absolutely free and easy too. Keyboard Checker is 100% safe to use free online keyboard tester. Keyboard checker doesn't upload or record anything. Keyboard Tester is very fast and has a very simple interface. Whenever you press a key, the virtual keyboard responds immediately and displays the results of your keyboard checker.