Mouse Test — Check Buttons, Wheel and Double-Click
- Left
- 0
- Middle
- 0
- Right
- 0
- Back
- 0
- Forward
- 0
- Scrolls
- 0
Click the same button several times to check for a double-click fault.
- Last interval
- —
- Position
- —
About the Mouse Test
A failing mouse rarely dies all at once. Far more often a single button starts sending two signals for one press, so files open when you meant to select them and you lose your place in a game. The fault is a worn switch inside the button, and it is easy to confuse with an accidental double-click by the user.
This test settles it with a number. Every time you press a button it measures the gap since the last press of that same button. A human finger cannot produce two deliberate presses less than about fifty milliseconds apart, so anything shorter did not come from you — it came from the switch bouncing. The tool counts those events and tells you plainly whether it saw any.
The same page also checks the things that fail less dramatically: whether each button registers at all, whether the side buttons work, and whether the scroll wheel reports both directions. Everything runs in your browser and nothing is sent anywhere.
How to test your mouse
- Click the left button on the diagram about ten times at your normal speed.
- Watch the verdict line. If it reports a fault, one physical press was registered twice.
- Repeat with the right and middle buttons, and with the side buttons if your mouse has them.
- Scroll the wheel up and down and check that both arrows light up and the counter rises.
- Move the pointer across the test area to confirm the position readout tracks smoothly.
- Press Reset to clear the counters and run the checks again.
Frequently asked questions
What exactly is a double-click fault?
The switch under the button has worn out and bounces, sending two electrical signals when you press once. The computer has no way to know the second signal was unintended, so it acts on both. It usually starts intermittently and gets worse over weeks.
Can a double-click fault be repaired?
Sometimes. If the mouse is under warranty, claim it — this is a recognized failure. Otherwise the switch can be replaced by soldering, and some switches can be revived by cleaning the contacts. Software that ignores rapid repeats only masks the symptom.
Why is fifty milliseconds the threshold?
It is faster than a deliberate human double-click, which normally lands somewhere between about one hundred and five hundred milliseconds apart. Anything under fifty milliseconds is outside what a finger can do, so it points to the switch rather than to you.
My side buttons stay at zero. Are they broken?
Most likely your mouse simply does not have them, or the browser is using them for back and forward navigation before the page sees them. Many mice with software drivers also map those buttons to custom actions that never reach the browser.
The scroll counter jumps by more than one per notch. Why?
Jumping by more than one per notch is normal. Free-spinning wheels and touchpads emit many small scroll events rather than one per detent, and some systems send several events for a single notch. The counter records events, not physical clicks of the wheel.
Is any of this recorded?
No. Every click and movement is handled inside the page and discarded immediately. Nothing is sent to a server, saved to your device, or shared with anyone.
Is the Mouse Test free, and do I need to install a driver or utility?
Free, with no account, no email and no software. Mouse manufacturers ship their own utilities, but those only see their own hardware and often want a login — this page reads the same button and wheel events your operating system already sends to every web page, whatever brand the mouse is.
How long should I keep testing?
The buttons and the wheel answer in seconds. A double-click fault does not: it is intermittent by nature, so a mouse that looks clean after five clicks can still fail twice in fifty. Give a suspect button a minute of ordinary clicking before you decide it is healthy.