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Mouse Scroll Test — Check Your Scroll Wheel Online

Test every mouse button online: left, right, middle and side buttons light up on a mouse graphic, with press counters, a scroll check and a double-click detector.

Click, double-click and scroll inside this area. The right-click menu is disabled here so every button can be tested.

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Left
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Right
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Middle
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Back
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Forward
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Scroll up
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    Each entry is the time between two clicks of the same button. A deliberate double-click lands around 150–500 ms; intervals under 80 ms are flagged as suspected switch bounce — the fault behind a mouse that double-clicks by itself.

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    Result

    This page opens the mouse tester with the scroll counters highlighted: place the pointer inside the test area and spin the wheel — up and down steps are counted separately, and the page itself stays still.

    Scroll slowly, one notch at a time, and compare the counters with what your finger did. A healthy wheel adds exactly one step per notch in one direction. A dirty or worn encoder shows up immediately: steps get skipped, or a slow downward scroll suddenly adds an up step — the dreaded scroll jump that throws pages around.

    Also press the wheel straight down: the middle button has its own counter here, and middle-click autoscroll is suppressed inside the area. If the wheel scrolls fine but the middle click misses presses, the click switch under the wheel is the worn part, not the encoder.

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    Executed in Browser

    Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

    Accepted Formats & Rules

    • On-screen mouse graphic that lights up left, right, middle, back and forward buttons via mousedown, with per-button press counters.
    • Scroll wheel check with separate up and down step counters driven by real wheel events.
    • Double-click detector: a log of intervals between consecutive clicks of the same button, flagging gaps under 80 ms as suspected switch bounce.

    Key Benefits

    ✓ One page for the whole mouse: buttons, wheel and side keys are tested in a single area with the context menu suppressed.
    ✓ Honest double-click diagnosis: the log shows real intervals between clicks in milliseconds instead of a vague pass or fail.
    ✓ Nothing to install and nothing leaves your device — clicks are read from standard browser events, locally.

    Use Cases

    • • Prove a suspected hardware double-click: single-click repeatedly and look for flagged intervals under 80 ms in the log.
    • • Check every button of a new or second-hand mouse — including the side back/forward keys — before trusting it for work or games.
    • • Diagnose a skipping scroll wheel: spin one notch at a time and compare the up and down step counters with what your finger did.