Mouse Checker
See mouse position, button state, and recent click/wheel events.
Move and click anywhere to see position and button state.
About Mouse Checker
Test every mouse button and the scroll wheel in your browser. Watch live cursor coordinates, held buttons, and a timestamped event log that makes double-click glitches and wheel skips easy to spot.
What this tool does
Move your mouse within the test area to see live coordinates (clientX, clientY) and which buttons are currently pressed. The event log captures mousedown, mouseup, click, and wheel events with timestamps. It's a quick way to verify that all mouse buttons and the scroll wheel are working.
When you'd use this
- Testing a new mouse to confirm all buttons register
- Checking if your scroll wheel is skipping or registering double-clicks
- Debugging mouse input in a web application
- Verifying that side buttons (button 3, button 4) are detected by the browser
Mouse event details
Browsers assign button numbers starting from 0: left click is 0, middle click (scroll wheel) is 1, right click is 2, and side buttons are 3 and 4. The event log shows which button triggered each event, along with the exact coordinates where it happened. Wheel events include the scroll delta so you can check for smooth vs. notched scrolling behavior.