A mouse check that runs in your browser
There is nothing to download. Open the page, move your pointer into the box and start clicking. Because it needs no driver and no admin rights, it is useful on a computer where you cannot install anything, and it gives you a neutral check that does not depend on any mouse software.
The tool is not scored and keeps no history. Nothing is uploaded.
What a browser can detect
When you press a mouse button, the browser tells the page which button it was. It names five: Left, Middle, Right, Back and Forward. Back and Forward are the two thumb buttons found on many mice. A press reported beyond those five shows up in the log as an extra button with its number.
The browser also reports wheel movement and its direction. The tester counts scrolling up, down and sideways, which covers tilting wheels and trackpads. It also times each left press closely enough to flag two clicks less than 80 ms apart, the usual sign of an unwanted double click.
Inside the box, the page switches off the browser’s own reactions to the buttons: the right click menu, back and forward navigation and middle click auto-scroll. Testing a side button does not send you to the previous page.
What a browser cannot detect
| Check | Possible in a browser? |
|---|---|
| Left, Middle, Right, Back and Forward | Yes |
| Scroll up, down and sideways | Yes |
| Left clicks closer than 80 ms | Yes |
| DPI | No |
| Polling rate | No |
DPI is a property of the mouse sensor. A web page only sees how far the pointer moved on screen, and that distance mixes DPI with your system pointer speed and any acceleration. Polling rate, how often the mouse reports to the computer, is also outside what this tool measures. For those numbers, check the specifications of your mouse or the software that came with it.
When to use it
Use it when a button starts to feel unreliable, when you get a new mouse, or before a session where every click matters. For a step-by-step button check and a guide to reading the log, see the mouse test. To measure speed rather than function, the CPS test counts your clicks per second.