Mouse Tester
Check that every button and the scroll wheel on your mouse works. Hover over the diagram, then click each button and scroll up and down — the matching part lights up, counts climb, and worn-switch double-clicks are flagged. Want to measure speed instead? Try the CPS Test.
Event log
latest 16No events yet — click a button or scroll the wheel.
How it works
Move your cursor over the mouse diagram and press each button in turn — left, right, middle, and the side buttons— then roll the wheel up and down. Each input lights up the matching region, ticks its counter, and fills the “buttons detected” meter. The right-click menu and side-button navigation are held back over the pad so nothing interrupts the test.
Spotting a failing switch
The most common mouse fault is a worn switch that double-clicks— turning one press into two. This tool watches the gap between presses of the same button and flags any pair landing under 80 milliseconds apart, faster than a deliberate human click, as a misfire. A stray flag while you're clicking quickly is fine; repeated misfires from single, careful clicks mean the switch is on its way out.
Reading the scroll test
Scroll up and down are counted on their own so you can catch a one-directional encoder fault. Even counts in both directions are healthy; counts that only rise one way, skip, or jump backwards point to a dirty or worn scroll encoder. If the wheel feels gritty or bounces, a clean or repair often brings it back. For a deeper, timed check that measures scroll speed and flags reverse jitter, use the dedicated Mouse Scroll Wheel Test.
Test the rest of your mouse
Buttons working but the mouse still feels off? Measure how often it reports to your PC with the Mouse Polling Rate Tester, check end-to-end responsiveness with the Input Lag Tester, or benchmark your click speed on the CPS Test.
Frequently asked questions
What is a mouse tester?
It's a diagnostic tool that checks whether every button and the scroll wheel on your mouse responds correctly. You click each button and scroll the wheel over the test pad, and the matching part of the on-screen mouse lights up to confirm it registered. It's handy for checking a brand-new mouse, troubleshooting one that's misbehaving, or confirming a repair — all in the browser with nothing to install.
How do I test my mouse buttons?
Hover your cursor over the mouse diagram, then press each button one at a time: left, right, middle (the scroll-wheel click), and the side buttons if your mouse has them. The corresponding region lights up and its counter ticks up, and the 'buttons detected' meter fills as you cover all six. If a button never lights up no matter how you press it, that button — or its switch — isn't registering, which points to a hardware, driver, or connection problem.
How does the scroll wheel test work?
Roll the wheel up and down over the pad. Each notch is counted separately for up and down, and the chevrons above and below the wheel light up by direction. Tracking the two directions independently matters because scroll encoders can fail one way at a time — if 'Scroll ↑' keeps counting but 'Scroll ↓' stays at zero, the encoder is worn or dirty in that direction. Smooth, even counts in both directions mean the wheel is healthy.
What is a double-click test and why does it matter?
A failing mouse switch can 'chatter' — registering a single physical press as two clicks. This tool times the gap between presses of the same button, and if two land closer than 80 milliseconds apart, which is faster than a human can deliberately click, it flags a double-click misfire and shows it in red. An occasional flag during rapid clicking is normal, but frequent misfires from single, deliberate clicks are a classic sign the switch is wearing out and the mouse may need repair or replacement.
Why do my side buttons navigate back instead of testing?
The side buttons on most mice are mapped to browser back and forward, so the browser may try to navigate when you press them. The test pad intercepts those buttons while your cursor is over it so they register here instead of moving you through history. If a side button still navigates, make sure your cursor is inside the pad when you click it; outside the pad the browser handles it normally.
Does it work with any mouse, or on a laptop trackpad?
It works with virtually any wired, wireless, or Bluetooth mouse, since the browser receives the same standard click and scroll events from all of them. A laptop trackpad can register left and right clicks and two-finger scrolling, but it has no middle or side buttons and no real scroll wheel, so several tests won't apply. For a full check you'll want an actual mouse.