A keyboard that misses keystrokes, repeats characters, or has unresponsive keys can make typing feel impossible. Whether you are writing an email, coding, or gaming, even a single faulty key can throw off your entire workflow. The good news is that you do not need to install anything to figure out what is wrong. You can test your keyboard online directly in your browser and see exactly which keys are working and which ones are not. This guide explains the most common keyboard problems, how to check each key, and what you can do to fix issues yourself. Signs Your Keyboard Might Be Failing Before running a keyboard test, it helps to recognize the symptoms of a keyboard that needs attention: Keys not responding — You press a key, but nothing appears on screen. You have to press harder or multiple times before it registers. Repeated characters — A single keypress produces two or more of the same character, like typing "heeello" instead of "hello." Stuck keys — A key stays pressed even after you lift your finger, causing a long string of repeated characters. Delayed typing — There is a noticeable lag between pressing a key and seeing the character appear. Certain keys not working — Most of the keyboard works fine, but specific keys like Shift, Enter, or a letter key do not respond at all. If any of these sound familiar, testing your keyboard is the fastest way to confirm the problem and figure out what to do next. How to Test Your Keyboard Online A browser-based keyboard tester lets you check every key without downloading or installing software. The keyboard test on this site listens for your keyboard input in real time and highlights each key as you press it.