Your keyboard may be got water inside or drop. Now you may need to check whether all the keys are working or not. So you will need a keyboard checker or keyboard tester online. Our keyboard checker allows you to verify all the keys are working correctly or not. Though, via TypingKeyboards.com, you can immediately proceed with testing. It works online, so no need to download software or application. Start to press the keyboard keys in sequence. The buttons that are press will display on the screen in green. If red keys display on the screen before the test starts, they are most likely damaged. Most often, in such cases, a keyboard needs to replace. It is unlikely to repair.