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Keyboard and mouse test

Press any key. Keys turn green once they register.

0 of 0 tested0 untested0 stuck0 chattering

Keys with a dashed outline, media keys and brightness keys are handled before the browser sees them, so they cannot light here. Nothing is stored or sent. Even so, never type a password into a keyboard tester.

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Keyboard test: every key, plus chatter and ghosting

Press keys and watch them turn green. Then use the tabs to catch a key that double-types, count how many keys register at once, or check your mouse buttons.

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The short answer

To test a keyboard, press every key and watch the on-screen layout fill in. A key that never lights is not reaching the browser, which points at the hardware, the connection or a driver. A key that turns red is chattering — one press registering twice, usually a worn or dirty switch. A key that turns amber has been held for three seconds and may be stuck.

Getting it right

Four things worth knowing

  • Pick the layout you actually own

    ANSI, ISO, Mac, laptop and 60% boards put keys in different places. Choose yours so the untested count means something — a 60% board has no F row to miss.

  • Prove chatter with slow, single presses

    Double-typing is intermittent. On the Chatter tab, tap the suspect key about forty times, one deliberate press at a time. A human cannot release and re-press within 50ms; a bouncing switch does.

  • A dark key is not always broken

    Fn, media keys and screen brightness are handled by the keyboard or the operating system before the browser sees anything. They are drawn with a dashed outline so you do not chase them.

  • Copy the summary for a warranty claim

    The Copy summary button gives a dated, plain-text list of untested, chattering and stuck keys. Paste it into a support ticket or an RMA form instead of describing the fault from memory.

Nothing leaves your device

This test runs entirely in your browser. There is no upload, no recording and no server that could receive anything — close the tab and it is gone.

  • No sign-up and no account
  • Nothing recorded or stored
  • Works with an ad blocker on
  • Free, and staying free
FAQ

Questions people ask

Anything we've missed?

Tell us

Are my keystrokes recorded?

No. Keys are read to light the layout and count presses, and nothing is stored or sent. The summary goes to your clipboard only when you press Copy. Even so, do not type passwords into any keyboard tester — it is a habit worth keeping.

Why does my keyboard type letters twice?

That is switch chatter: the metal contact bounces as it closes and the keyboard reads two presses. The Chatter tab flags any press that follows a release faster than a finger can move. Cleaning helps if it is dirt; a worn switch needs replacing, or a longer debounce setting in the keyboard's software.

Some keys never light up. Is the keyboard broken?

Not necessarily. Media keys, brightness keys and Fn are intercepted before the browser sees them. A letter, number or modifier that stays dark after you press it is a genuine problem.

How do I test for a stuck key?

Take your hands off the keyboard and watch. A key held down for more than three seconds turns amber and is counted as stuck. Debris under the cap is the usual cause.

How many keys can my keyboard press at once?

Open the Rollover tab and hold keys down together, adding more one at a time. The page shows the most it saw at once. Six or more is fine for almost every game; three to five means some combinations will ghost. The browser shows a floor, not the keyboard's true maximum.

Can I test my mouse here too?

Yes. The Mouse tab counts left, right, middle, back and forward clicks and scroll steps, flags two clicks arriving faster than a finger can make them — the classic double-click fault — and runs a five-second click speed test.

Test it for something specific

Other device tests

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Before it matters

Find the problem now, not mid-sentence

Every one of these runs in the browser and checks one thing properly. Nothing is uploaded, nothing is recorded, and none of them need an account.

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