Mouse Tester

What the Mouse Tester does

The Mouse Tester checks whether your mouse's buttons, scroll wheel, and movement tracking are working correctly, giving instant visual feedback for every click, scroll, and movement so you can spot a faulty button or unreliable sensor.

How to use it

1. Click each mouse button (left, right, middle/scroll-click) to test it.
2. Scroll up and down to test the scroll wheel.
3. Move the mouse around to check tracking responsiveness.

Common uses

• Checking whether a mouse button has started double-clicking or not registering, a common sign of wear.
• Testing a new or secondhand mouse before relying on it for gaming or work.
• Diagnosing an unreliable scroll wheel that skips or scrolls in the wrong direction.
• Verifying mouse functionality after a driver update or OS change.
• Confirming all buttons on a multi-button gaming mouse register correctly.

Good to know

If a button intermittently fails to register here, it's a hardware-level issue with the mouse itself (usually a worn switch) rather than a software or driver problem, since this test reads raw browser input events directly from the click and scroll actions.

Mechanical mouse switches wear out through simple physical use — the microswitches beneath each button have a rated lifespan measured in millions of clicks, and as they age, they can start double-clicking on a single press or intermittently failing to register at all, which is exactly the kind of failure this test is designed to catch clearly and repeatably rather than leaving you guessing.