My mouse double-clicks when I press once — how do I test and fix this?

This is the most common mouse failure, caused by a worn microswitch that registers two electrical signals from a single physical press. Use this tester to diagnose: rapidly click the left button 10-20 times while watching the event log. Each red 'Double Click' entry indicates a bounce. A healthy switch should produce zero red flags. If you see frequent detections, the switch contacts are likely oxidized or the metal dome has fatigued. Try adjusting the DC Threshold slider — 50ms for strict detection or 150ms for a looser window. Temporary fix: spray contact cleaner into the switch and click rapidly 30-50 times. Permanent fix: replace the microswitch or the mouse.

Is this online mouse tester safe? Does it upload my data anywhere?

Yes, it is completely safe. The mouse tester runs entirely in your browser using JavaScript — no plugins, no downloads, and no server communication. All mouse click data, cursor positions, CPS test results, and event logs stay in your browser's memory and are never transmitted to any server. You can verify this by checking the Network tab in your browser's developer tools. The tool works offline after the initial page load.

How does the CPS (Clicks Per Second) test work?

The CPS test measures how fast you can click the left mouse button within a set time window. Select a duration (5, 10, 15, or 30 seconds), then click Start. After a 3-second countdown, the test begins. Every left mouse button click increments the counter. Your live CPS is calculated as total clicks divided by seconds elapsed, updated in real time. When the timer expires, your final average CPS is displayed. The tool also tracks your peak CPS — the highest average across all tests in your current session.

What is double-click detection and how do I use it?

Double-click detection identifies when a mouse microswitch registers two electrical signals from a single physical press — a common failure mode in aging mice. The tool measures the time between consecutive mousedown events from the same button. If the interval is shorter than the configurable threshold (default 80ms, adjustable from 30ms to 200ms), the event is flagged as a 'Double Click' in red in the event log. To test your mouse, rapidly click the left button 10-20 times. A healthy switch should produce zero red flags. Frequent double-click detections indicate the microswitch is wearing out and may need replacement.

Why don't some of my mouse buttons show up when I press them?

Most mice expose 5 standard buttons through browser events: left (button 0), middle (button 1), right (button 2), back (button 3), and forward (button 4). Additional buttons like DPI switchers, profile selection buttons, programmable macro keys, or application-specific shortcuts are often intercepted by the mouse manufacturer's driver software and are not passed to the browser as standard button events. Some gaming mice require proprietary drivers to map extra buttons to keyboard keys or standard mouse buttons. If a button doesn't register in the tester, try installing the manufacturer's software or check if the button is mapped to a keyboard shortcut instead.

Does the scroll wheel test work with smooth / free-spinning scroll wheels?

Yes, the scroll wheel test detects both notched (stepped) and smooth (free-spinning or hyper-fast) scroll wheels. A notched wheel produces discrete scroll events, each with a consistent delta value, shown as distinct increments in the scroll counter. A smooth or free-spinning wheel generates many rapid, small scroll events as the wheel decelerates, appearing as a burst of accumulated scroll distance. The direction indicators use blue for upward scrolling and amber for downward scrolling. This is useful for testing Logitech Hyper-fast, Razer FreeSpin, or similar smooth-scrolling wheels.

Can I test a wireless mouse or Bluetooth mouse with this tool?

Yes. The mouse tester works with any pointing device recognized by your operating system, including wireless USB dongle mice, Bluetooth mice, wired mice, and laptop trackpads. Wireless connectivity (including Bluetooth) operates at the operating system level and is transparent to the browser — if your OS detects clicks and movement from the device, the tester will display them. For Bluetooth mice, ensure the device is paired and connected before testing. Lag or inconsistent response may indicate wireless interference, low battery, or Bluetooth connection issues rather than the mouse hardware itself.

How do I test a laptop trackpad with this mouse tester?

Laptop trackpads are fully supported. Left click is typically a single tap or press on the trackpad surface. Right click is a two-finger tap or pressing the bottom-right corner. Middle button may be a three-finger tap (depending on driver settings). Scroll by swiping two fingers up or down — the scroll indicator and counter will register the movement. Trackpad gestures like pinch-to-zoom or four-finger swipe are operating system functions and may not generate standard button or scroll events. If the trackpad response feels slow in the tester, try adjusting the trackpad sensitivity in your system settings.

What do the colored highlights on the mouse diagram mean?

The mouse diagram uses distinct colors to indicate which button is currently pressed: blue for the left button, red for the right button, amber/yellow for the middle (scroll wheel press), orange for the back button, and green for the forward button. When you press and hold a button, the corresponding area on the diagram stays highlighted until you release. The scroll wheel well changes to blue when scrolling up and amber when scrolling down. These real-time visual cues make it easy to confirm each button is functioning correctly at a glance.

Does this mouse tester work on mobile or tablet browsers?

The mouse tester is designed for desktop and laptop use with a physical mouse, touchpad, or trackpad. While the page may load on mobile and tablet browsers, touch input is not explicitly supported — the tool depends on mouse-specific pointer events (left, right, middle clicks, scroll wheel). Some functionality may partially work on tablets with external mouse accessories connected via Bluetooth or USB. For a native touch-testing experience, consider a dedicated touch screen tester.

What is the mouse movement trail feature for?

The mouse trail feature visualizes your cursor movement path in real time on the test zone canvas. A fading blue line follows your mouse as you move. Red circle markers appear at each click position. When you click and drag while holding a button, a colored line (green for active drag, orange for completed drags) is drawn along the drag path. This is useful for testing mouse tracking precision, verifying that the sensor doesn't skip or jump during slow movements, and assessing overall cursor responsiveness — particularly relevant for graphic designers, digital artists, and competitive gamers who require precise cursor control.

Why doesn't this tester measure polling rate (Hz) or click latency / response time?

Rather than show misleading estimates, we focus on what we CAN measure accurately: button registration, double-click detection, CPS, scroll precision, and cursor tracking — all using standard browser events with reliable timing. We believe honesty about limitations builds more trust than displaying fake benchmark numbers.

Can this tester detect mouse disconnection or intermittent issues (mouse cutting out / cursor freezing)?

Yes. While we cannot measure polling rate, the tester can help identify intermittent connection problems through several indicators. Scroll wheel test: if the scroll counter shows sudden gaps or uneven totals between up and down directions when scrolling smoothly, the connection may be dropping. Click test: if clicks occasionally don't register (counter doesn't increment despite feeling the click), the signal may be intermittently lost. Mouse trail: if the trail line shows abrupt jumps or gaps during slow, steady movement, the sensor or connection may be losing tracking momentarily. These symptoms are common with loose USB cables, dying wireless batteries, USB port interference, or failing mouse sensors. If you notice any of these patterns, try a different USB port, replace the batteries, or test with a different mouse to confirm.

Mouse Tester — Test Double Click, Buttons & Scroll Online Free

Free online mouse tester. Test all mouse buttons (left, right, middle, back, forward) with real-time visual feedback. Check for double-click issues from worn microswitches — the #1 cause of mouse failure. Measure clicks per second with the CPS test, test scroll wheel precision, track cursor position, and view detailed click event logs. Works with wired, wireless, gaming mice and laptop trackpads. No download needed — runs 100% in your browser with zero data upload.

Features

✓Real-time mouse button testing — left, right, middle, back, and forward buttons light up on the mouse diagram when clicked, with individual click counters for each button
✓CPS (Clicks Per Second) test — timed modes from 5 to 30 seconds with live CPS display, peak CPS tracking across all tests, and real-time remaining countdown in the test zone
✓Double-click detection — adjustable threshold from 30ms to 200ms helps identify worn microswitches that register unintended double clicks from a single press
✓Scroll wheel precision test — tracks scroll up, down, left, and right distance with color-coded direction indicators for both notched wheels and free-spinning scroll wheels
✓Cursor position tracking — real-time X and Y coordinates displayed below the mouse diagram for precise movement tracking
✓Click hold duration measurement — records exactly how long each mouse button is held down, shown in milliseconds in the detailed event log
✓Mouse movement trail visualization — draws a fading trail path and click markers on the test zone canvas, with color-coded drag segment lines for different buttons
✓Complete event history log — timestamped entries for every mouse down and up event, with button labels, hold duration, double-click flags, and scroll direction information
✓Works with all pointing devices — wired and wireless mice, gaming mice with extra buttons, laptop trackpads, and Bluetooth mice. Private and secure — all data stays in your browser

How to Use

1Enter the test zone: once the mouse tester loads, the interactive area is ready. Click any mouse button or move your mouse over the diagram to begin. The large mouse diagram provides real-time visual feedback — pressed buttons light up with distinct colors for each button type.
2Test individual mouse buttons: click the left, right, middle (press the scroll wheel), back, and forward buttons on your mouse. Each click increments the corresponding counter card above the test zone. The mouse diagram highlights the pressed area, making it easy to confirm every button registers correctly.
3Run a CPS click speed test: select a time duration from the CPS toolbar section — 5 seconds for quick benchmarks, up to 30 seconds for endurance testing. Click the Start button, then a 3-2-1 countdown appears in the test zone. When the countdown ends, click the left button as rapidly as possible. Watch your live clicks-per-second update in real time. When the timer expires, your final CPS score is displayed.
4Detect double-click issues from worn switches: rapidly click the left button several times while watching the event log. If entries appear with a red 'Double Click' tag, your mouse microswitch may be registering two signals from a single press. Adjust the DC Threshold slider to fine-tune detection sensitivity — lower values (30ms) catch faster bounce artifacts, higher values (200ms) detect slower unintended double clicks.
5Check scroll wheel accuracy: scroll up and down with your mouse wheel. The scroll card on the left and the direction indicators on the scroll wheel area of the diagram will respond. Blue highlights indicate upward scrolling, amber indicates downward. The counter tallies total scroll distance for each direction, useful for diagnosing dirty or failing scroll encoders.
6Review click history and hold duration: the event log at the bottom records every mouse action with a precise timestamp. Each entry shows which button was pressed, whether it was a down or up event, how long it was held, and if it was flagged as a double click. Use the Clear button to reset the log or the overall Reset button to clear all counters and test data.