Mouse Tester is a free online tool that checks your mouse right in your browser, without installing anything. It detects double-click faults by timing the gap between your clicks, tests the left, right, middle and side buttons, verifies the scroll wheel in both directions, and measures your clicks per second (CPS) — so you can spot a worn switch or a dead button in seconds.
100% in your browser — nothing uploaded or installed
Button test
Press each button on your mouse — it lights up below with a live press count. Right-click is captured (no context menu).
Left
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Right
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Middle
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Back
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Forward
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Move the mouse over this card — position: –, –
Double-click test
Click the pad with single, deliberate presses. We time the gap between clicks and flag any unintended double-click (switch chatter).
Click a few times to check for double-click faults.
CPS test — clicks per second
Pick a duration, then click the pad as fast as you can. The timer starts on your first click.
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clicks per second
Clicks: 0Best CPS: 0.0
Scroll wheel test
Hover the zone and scroll up and down. Every notch is counted — watch for skipped, jumpy or reversed scrolling.
Scroll up & down here
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How to test your mouse online
1
Test every button
Press left, right, middle (wheel click) and the two thumb side buttons. Each one lights up on the mouse diagram with a live press count, so a dead or unresponsive button is obvious.
2
Check for double-clicks
Use the double-click pad with single, deliberate presses. The tool times the gap between clicks and flags any pair closer than your threshold — the tell-tale sign of a worn, chattering switch.
3
Verify the scroll wheel
Scroll up and down in the scroll zone. Every notch is registered and counted, revealing a wheel that skips, jumps or scrolls the wrong way.
4
Measure your CPS
Run the clicks-per-second test to benchmark your speed and confirm the button registers every rapid press without missing or doubling.
What a double-click test tells you
A double-click fault — also called switch chatter or click bouncing — is when a single physical press of the mouse button registers as two clicks. It is the most common way a mouse fails: dragging files becomes impossible, single clicks open items twice, and selecting text misbehaves. The cause is almost always the tiny mechanical micro-switch under the button wearing out, so its contacts bounce instead of making one clean connection.
This tester measures the exact time, in milliseconds, between each of your clicks. Healthy, deliberate single clicks are normally separated by 150 ms or more. When a switch chatters, a single press produces two events only a few milliseconds apart — far faster than a human can intentionally click. Any interval below your chosen threshold is highlighted in red and the verdict warns you of a likely fault:
Gap between clicks
What it means
Verdict
Under ~50 ms
Almost impossible to do on purpose — the switch is bouncing.
Likely double-click fault
50–90 ms
Faster than a deliberate single click; suspicious if you only pressed once.
Possible early wear
90–500 ms
Normal range for an intentional double-click (e.g. opening a file).
Healthy
Over 500 ms
Separate, deliberate single clicks.
Healthy
Set the threshold to Strict if you want to catch only the worst chatter, or Loose to surface a switch that is just starting to wear. Click 15–20 times with single presses; even one unexpected red interval is a sign the switch is on its way out.
How to fix a mouse that double-clicks
If the test confirms chatter, you have a few options before binning the mouse:
Adjust the double-click speed in your operating system (Windows: Mouse settings; macOS: Trackpad & Mouse). A slower setting masks mild chatter but does not repair the switch.
Blow out or clean the switch with compressed air or a drop of contact cleaner through the button gap. This often buys months on a lightly worn switch.
Re-tension or replace the switch. Enthusiasts open the mouse and bend the switch's metal contact leaf or solder in a fresh Omron/Kailh switch — a cheap permanent fix if you are comfortable with electronics.
Replace the mouse if it is out of warranty and not worth repairing. Run this test on the new one straight away so you can return it within the window if it is faulty.
Re-run the double-click test after any fix to confirm the chatter is gone.
Works with any mouse on any computer
The tester uses standard browser pointer events, so it works with wired and wireless mice, trackballs and laptop trackpads on Windows, macOS, Linux and ChromeOS — no driver or download required. Gaming mice with extra side buttons are fully supported (back and forward thumb buttons are detected). Touchpads register left and right clicks and two-finger scrolling.
Use the Double-Click Test pad and click it with normal, single presses. The tool times the gap between each click and flags any two clicks closer together than your threshold (about 90 ms by default). If one physical press registers as two clicks, or you see intervals under ~50 ms you never intended, the switch is chattering — a classic double-click fault.
What causes a mouse to double-click on a single click?
Switch wear. The micro-switch under the button develops a worn or oxidised contact, so one press bounces and the computer reads two clicks. It is very common on gaming mice after heavy use. Cleaning the switch helps temporarily; the permanent fix is replacing the switch or the mouse.
Is this mouse tester safe and free?
Yes. It is completely free, needs no download or sign-up, and runs entirely in your browser using standard pointer events. Nothing is uploaded or installed and no data leaves your device. It works on Windows, macOS, Linux and ChromeOS in any modern browser.
How do I test the side buttons and scroll wheel?
Press each button over the mouse diagram — left, right, middle (the wheel click) and the two thumb side buttons (back and forward) light up with a live press counter. For the wheel, scroll up and down inside the scroll-test zone; every notch is counted so you can spot a wheel that skips, jumps or scrolls the wrong way.
What is a CPS test?
CPS means clicks per second. The CPS test counts how many times you click in a fixed window (1, 5 or 10 seconds) and shows your average clicks per second. Gamers use it to measure clicking speed and techniques like jitter and butterfly clicking, and it is a quick way to confirm a button registers every press.
Why does the right-click test show a menu?
This tool disables the browser's right-click context menu inside the test area so right clicks register cleanly on the mouse diagram. If a menu still appears, the click landed outside the test zone — aim for the mouse diagram or the click pads.