With the help of the keyboard tester online, you can check whether there actually is a problem with your keyboard or not. The keyboard tester online gives you a chance to check each and every button on your keyboard. When you press a key on the keyboard while using the keyboard tester website, a specific tab will be open to you where you will be required to press the key and check its functionality. If the key types the letter you have been meaning to type, then that particular key is not affected. However, if the colour does not change while you are pressing a certain key, that means that there is an issue with that specific key. Otherwise, every key which is efficiently working, changes colour on being pressed. Once the problem has been demarcated, you can take a professional help after.