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Keyboard Tester

See every key you press to find dead or repeating keys.

Keys you press light up on the keyboard below. On mobile this works only with a physical (Bluetooth) keyboard connected.

Held down Pressed Not pressed
key--
code--
keyCode--
location--

Input log (last 20)

    Keys you press are never sent to a server; they are handled only in this browser.
    What is the keyboard test?

    A tool that shows, on an on-screen keyboard layout, whether each key registers properly. Held and pressed keys use different colors, so keys that do not register or that repeat are easy to find.

    How to use it

    Open the page and press keys one by one. The Korean 106-key layout (with Han/Eng and Hanja keys) is the default, and you can switch Show numpad and Mac layout. Browser shortcuts such as F5 are blocked by default; turn off Block browser shortcuts if you need them. Reset clears the record.

    Note: Keys handled first by the operating system or browser, such as the Windows key, Fn and Ctrl+W, cannot be checked.
    Real-world uses

    Check every key on a new keyboard, find dead keys on a used one, or confirm a double-typing problem (chatter).

    FAQ

    How do I test my keyboard?
    Keep this page open and press the keys you want to check. A key is dark while held and stays lightly shaded once pressed, so the keys you have not tried yet are easy to spot. The key, code and keyCode values of the last key are shown too.
    Does a key that does not respond mean it is broken?
    Not necessarily. First click the page to give it focus and press the key again. The Han/Eng and Hanja keys are reported differently depending on the browser and operating system, so they may not show up. If the same key fails in other programs too, a faulty switch or connection is likely.
    Why do the Windows key and Fn key not show up?
    Combinations such as the Windows key, Alt+Tab and Ctrl+Alt+Del are intercepted by the operating system before they reach the browser. The Fn key is usually handled inside the keyboard and sends nothing to the computer. Browser-reserved shortcuts such as Ctrl+W and Ctrl+T cannot be blocked by a page either. This tool cannot check such keys.
    What is chatter and how is it shown?
    Chatter is when a single key press registers several times, often on worn key switches. If the same key is detected pressed again within 30 ms of being released, it gets a red outline and a count. People can hardly press that fast on purpose, so if it shows up repeatedly the switch is worth checking.
    Can I check a Mac or a tenkeyless keyboard?
    Yes. Turn on Mac layout to switch to the Command/Option arrangement, and turn off Show numpad to hide the numeric keypad. For laptop-style keyboards without a numpad, hiding it gives you a larger view.

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