Check the connection and selected device, then repeat the failed check: a button does not register.
Mouse test
Check every mouse button, both wheel directions, unintended duplicate clicks and pointer continuity locally in your browser.
Also known as: mouse test, mouse tester, mouse button test, mouse click test, mouse scroll test. Free, online, and no download required.
No permission neededNothing uploaded
Click, scroll or move the mouse inside the instrument to begin.
01
What the mouse test checks
| Check | How it is measured | Fails when |
|---|---|---|
| Button response | Pointer down and up pairs are counted separately for buttons 0 through 4. | A pressed button never produces a complete pair. |
| Wheel direction | Wheel events are counted by delta sign and retain their browser delta mode. | One direction never arrives or the counts remain strongly uneven. |
| Duplicate clicks | Intervals below 40 ms on the same button are isolated as suspect duplicates. | A physical press repeatedly produces a second immediate event. |
If something failed
Check the connection and selected device, then repeat the failed check: one click registers twice.
Check the connection and selected device, then repeat the failed check: the wheel skips or reverses.
02
How to read the result
How the mouse test works
The stage listens for pointerdown, pointerup, wheel and pointer movement only while it is mounted. Button indexes remain separate, wheel direction is derived from each event rather than from scroll position, and pointer samples enter a three-second ring buffer. The trail is drawn on canvas from refs at the display frame rate, so a high-rate mouse does not request a React render for every sample.
What the result can establish
Press the left, right and middle controls several times, use both wheel directions and move across the full stage. Side buttons are recorded when the browser exposes them, but browser navigation may reserve them.
Measurement limits
A browser cannot read switch wear, sensor firmware, USB packet contents or physical distance. A short clean run confirms only that the sampled events arrived during that run.
03
Mouse test questions
Is this mouse tester free, and does it need a download?
It is free and it runs entirely in this page. There is no installer, extension or account: the mouse test starts from your first click, scroll or movement inside the stage and stops when you leave the page.
Which controls does the mouse button test actually cover?
Button indexes 0 through 4 are counted separately, so left, right, middle and both side buttons each get their own down and up totals. Browsers reserve some side buttons for back and forward navigation, so an unlit side button is not automatically a fault.
Why does the mouse scroll test show uneven wheel counts?
Wheel direction is read from the sign of each event delta, and browsers report notched wheels, free-spin wheels and trackpads in different delta modes. Strongly uneven totals matter; a small difference between up and down usually reflects how you scrolled.