Mouse Test
Check every button and the scroll wheel, catch a mouse that double-clicks by itself, and measure its DPI.
Runs in your browser. Nothing you enter is uploaded.
Click, right-click, press the wheel and scroll here
Left 0 · Right 0 · Wheel click 0 · Back 0 · Forward 0 · Scroll ↑ 0 ↓ 0
Click in the box to start
Then click each mouse button and scroll the wheel both ways. Each part lights up when your computer receives it. Nothing is recorded or sent.
No mouse on a phone or tablet? Connect one first. On a touchpad, a two-finger click is a right-click.
Mouse DPI test
- Lay a ruler on your desk and line up the left edge of the mouse with 0.
- Press Start, then slide the mouse straight to the right by exactly the distance you chose.
- Click any mouse button to finish. Esc cancels.
Your DPI appears here.
How to use Mouse Test
- Click in the box with the left button, then right-click and press the wheel. Each button lights up while it is pressed.
- Scroll the wheel up and down over the box. The page stays still while the pointer is over it.
- Press the back and forward side buttons if your mouse has them.
- Keep clicking normally for a while: the test flags any click that repeats by itself and any wheel step that goes the wrong way.
- Copy the report if you need it for support or a warranty claim.
- To check your DPI, use the Mouse DPI test below the box with a ruler on your desk.
How it works
Your browser reports every press and release of a mouse button, with the button’s number and the exact time, and every step of the scroll wheel. The test lights up each part it receives, counts it, and checks the timing for faults. Nothing is recorded or sent anywhere.
While the pointer is over the box, the wheel tests the wheel instead of scrolling the page, a right-click doesn’t open a menu, and the wheel button doesn’t start autoscroll.
| On the diagram | What it means |
|---|---|
| Plain | Not pressed yet. |
| Outlined in green | Worked at least once. The number counts the presses. |
| Filled | Held down right now. |
| Red outline | Clicked twice by itself. |
| Arrow on the wheel | Lights up for each scroll step, up or down. |
Double clicks by themselves
A dirty or worn switch can bounce, so one click arrives as two. The same fault makes a drag drop halfway, because the switch lets go for a moment while you hold it. The test flags any second press that comes less than 40 ms after a release. No finger lifts and presses again that fast; even a quick deliberate double-click leaves a longer gap.
If you click with two fingers on purpose (butterfly clicking), the test may flag it. Click normally with one finger.
To check dragging, hold the left button for a few seconds and watch it: it should stay filled until you let go.
To check your double-click speed, double-click in the box: the result shows the time between the two clicks. Windows counts two clicks as a double-click when they come within the double-click speed in its mouse settings, 500 ms by default.
Scroll wheel test: a wheel that jumps
A wheel’s sensor counts steps as it turns. With dust or wear, it sometimes reads one step backwards, so the page jumps up while you scroll down. The test counts a single step in the wrong direction between steps in your direction, all within 150 ms. Scrolling one way and then the other is fine.
Side buttons
Most mice have back and forward buttons on the left side. In most browsers the test catches them before the browser can go back. Where it can’t, the browser goes back one step, the page stays open, and the back button counts as working.
If a side button doesn’t light up, the mouse may need its maker’s app to send it.
Mouse DPI test
DPI (or CPI) is how many counts the mouse sends per inch it moves. To measure it, lay a ruler on your desk, line the mouse up with 0, press Start, slide the mouse straight to the right by the distance you chose, and click. The page adds up the movement and divides it by the distance.
- Chrome and Edge give the mouse’s own counts, before Windows or macOS pointer speed and acceleration, so the result is exact. Other browsers apply those settings; turn off Enhance pointer precision in Windows for a closer reading.
- The setting it names, like 1,600 DPI, is the closest common setting within 10%. Mice are rarely exact, so 1,560 on a 1,600 DPI setting is normal.
- Measure two or three times. Being a millimeter off changes the result by a few percent, and a crooked line makes it too low.
Touchpads
A one-finger click is a left click and a two-finger click is a right-click. Two-finger scrolling tests the wheel, and touchpads send many small steps rather than notches. Most touchpads have no middle button, so skip it.
Fixes
| Fault | First fix | If that doesn’t work |
|---|---|---|
| Clicks twice by itself | Compressed air around the button, then click it firmly 20 to 30 times. Raise the debounce time if the mouse’s app has one. | The switch is worn: warranty, or a new switch. |
| Wheel jumps | Compressed air beside the wheel while you roll it. | The wheel sensor is worn: warranty, or a new mouse. |
| A button stays held | Press it firmly a few times. On Windows, turn off ClickLock (Control Panel → Mouse → Buttons). | Clean around it and try another computer. |
| Nothing responds | Another USB port, a fresh battery, or the receiver closer to the mouse. | Try the mouse on another computer. |
Questions
How do I test if my mouse is working?
Open this page, click in the box with each button and scroll the wheel both ways. Each part lights up when your computer receives it, and the result lists what hasn't responded yet. A part that stays dark while you use it isn't reaching your computer.
Why does my mouse double-click when I click once?
Usually a dirty or worn switch "chatters": it sends a second click a few milliseconds after the first. The test catches any second press less than 40 ms after you let go, which no finger can do. If it finds none but files still open with one click, Windows is set to single-click: in File Explorer, open Options and choose Double-click to open an item.
How do I fix a mouse that double-clicks?
Blow compressed air around the button and click it firmly a few dozen times, and raise the debounce time if the mouse's app has one. If it still clicks twice on another computer, the switch is worn: use the warranty or have the switch replaced. Changing the double-click speed in Windows doesn't fix it.
Why does my scroll wheel jump or scroll the wrong way?
The wheel's sensor reads a step in the wrong direction, usually because of dust or wear. Scroll steadily over the box: the test counts every step that goes the opposite way. Compressed air in the gaps beside the wheel often fixes it; if not, the wheel is worn.
Why don't my mouse side buttons work?
If they light up here, the mouse is fine and the app you're using ignores them or needs a setting. Some mice only send side buttons with their maker's software installed, and on a Mac many apps ignore them without it. If they don't light up here either, try the mouse on another computer.
How do I check my mouse DPI?
Use the Mouse DPI test on this page: put a ruler on your desk, press Start, slide the mouse exactly 2 inches (or 5 cm) to the right and click. The page divides the movement your mouse reported by the distance. Use Chrome or Edge for the most exact reading, and measure two or three times.
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Updated October 26, 2026 · Works in current Chrome, Edge, Firefox and Safari · Runs entirely in your browser