Use this mouse tester to check which inputs reach your browser. Test left, right and middle clicks, side buttons, scroll wheel, pointer movement and drag behavior.
Start the test, then click each mouse button, use the scroll wheel and move the pointer inside the test area.
Detected inputs indicate that your operating system and browser successfully received the corresponding mouse event. An active highlight shows a button is currently pressed, and a tested badge confirms successful release. Counters track individual button clicks, upward and downward scroll events, double-click intervals, and drag-and-drop continuity. If an input does not appear, check physical connections, driver remapping, or browser limitations.
Modern web browsers use the W3C DOM and Pointer Events specification to identify mouse buttons by standard index numbers. Button 0 represents the primary (left) button. Button 1 represents the auxiliary or middle button (usually pressing down on the scroll wheel). Button 2 corresponds to the secondary (right) button. Button 3 represents the Back thumb button (browser back), and Button 4 represents the Forward thumb button (browser forward). Our tester decodes these numerical event values in real time so you can confirm that each physical switch triggers the correct browser event code.
A computer mouse wheel performs two distinct functions: pressing down as a button (Middle Click) and rotating forward or backward (WheelEvent). Rotating the wheel fires wheel events with positive or negative vertical delta (deltaY) values. Our tester isolates upward and downward rotation into separate event counters so you can verify that both directions work smoothly without skipping or reversing. For mice equipped with horizontal tilt wheels or precision touchpads, horizontal delta (deltaX) is also tracked under additional inputs.
Mechanical mouse switches utilize spring-loaded copper contacts that can oxidize or lose tension over millions of clicks. When a failing switch contacts, it may rapidly bounce open and closed, causing the computer to register two or more clicks from a single physical press (switch chatter). To diagnose this, perform single clicks in our double-click test area. The tool tracks the elapsed time between presses: intervals under 80 milliseconds during casual clicking can be a strong hint of switch bounce, whereas deliberate double-clicks generally measure between 120 and 300 milliseconds.
Another common symptom of a degrading micro-switch is intermittent contact loss while a button is held down. When selecting text, dragging windows, or aiming in games, a failing switch may momentarily drop the connection and re-engage, causing the drag operation to cancel unexpectedly. Our drag-and-hold test requires you to grab a draggable block, hold the left button continuously, and carry it across to a target zone. If the drag drops early before reaching the target, repeat the test to evaluate switch hold reliability.
Mice with side buttons (Back and Forward) are widely used for gaming and web navigation. When pressed in a browser, Button 3 typically navigates back one page in history and Button 4 navigates forward. Inside our active test pad, the tester actively suppresses these default navigation actions so your side buttons can be checked safely. However, if your mouse manufacturer's software (like Logitech Options or Razer Synapse) has bound side buttons to non-standard keystrokes or system-level gestures, the browser may not receive standard mouse button events.
High-performance gaming mice often boast 1000 Hz, 4000 Hz, or 8000 Hz polling rates and adjustable DPI (dots per inch) settings. While browser-based movement trails can visually confirm that pointer events are arriving smoothly, JavaScript event execution is constrained by operating system pointer coalescing, compositor frame scheduling, and monitor refresh rates (such as 60 Hz or 144 Hz). As a result, web pages cannot measure physical USB polling frequency or calculate hardware DPI accurately without external calibration hardware.
This tester observes mouse, pointer, and wheel events delivered by your operating system to the web browser. It cannot measure raw USB hardware polling rate (such as 1000 Hz), measure optical sensor DPI, inspect internal switch resistance, or detect hardware-remapped buttons that do not emit standard browser PointerEvents.
Click Start Mouse Test to open the live workspace, then systematically click the left, middle, and right buttons, use the scroll wheel, press side buttons if available, and move your pointer inside the testing area. Each registered input updates the visual mouse and increments its counter.
Press each button individually inside the test area. The on-screen visual mouse highlights the corresponding button (Left, Middle, Right, Back, Forward) while it is held down and marks it as tested upon release, maintaining an independent click count for each.
Press directly downward on your scroll wheel until it clicks. In modern web browsers, wheel-click delivers a standard middle-button event (button 1). The tester intercepts this event and prevents browser auto-scroll so you can verify the switch.
Yes. If your mouse has thumb side buttons, pressing them inside the active test area registers as Back (button 3) and Forward (button 4). The tester attempts to prevent your browser from navigating away, though some operating systems or drivers reserve these buttons globally.
Place your cursor over the test pad and roll the scroll wheel upward and downward. The tester tracks Scroll Up and Scroll Down events separately, displays the total event count for each direction, and highlights wheel rotation.
Unwanted double-clicking is often caused by micro-switch contact bounce (switch chatter) inside a worn or dusty switch. Use the Double-Click & Rapid Repeat section to check the interval between clicks. If repeated clicks register within unusually short intervals (under 80 ms), repeat the test to confirm whether the switch may be failing.
Some mouse configuration software (such as Logitech G HUB, Razer Synapse, or Corsair iCUE) remaps side buttons to custom macros, keyboard keys, or DPI adjustments. In other cases, operating system security prevents browsers from intercepting thumb buttons. Ensure your mouse utility maps side buttons to standard 'Back' (Button 4) and 'Forward' (Button 5) actions.
No. Web browser pointer events are synchronized to the browser's display refresh cycle and event dispatch loop, which does not reflect physical USB hardware polling rate (such as 1000 Hz or 8000 Hz). Measuring true optical sensor DPI also requires physical distance calibration that web browsers cannot perform.
No. All pointer movements, button clicks, scroll deltas, and timing intervals are processed strictly in temporary local memory inside your web browser. Nothing is ever logged, stored in cookies, or transmitted to any server.