Scroll Test
Test your mouse wheel or trackpad scrolling — see direction, event count and activity in real time.
This test counts scroll wheel events as reported by your browser. It doesn't measure your mouse's actual internal polling or hardware step rate.
How to Use This Test
- Move your mouse over the scroll area below.
- Scroll up and down using your mouse wheel or trackpad.
- Watch the event count and direction update in real time.
Understanding Your Results
Each notch or gesture your scroll wheel or trackpad produces typically fires one or more scroll events, depending on your device and operating system settings. The direction indicator shows your most recent scroll input; the up/down counts let you check that both directions are being detected reliably.
About the Scroll Test
Scroll wheel issues — like a wheel that only scrolls in one direction, skips steps, or scrolls erratically — are a common sign of a worn encoder inside the mouse. This test gives you a simple, real-time view of exactly what your browser is receiving whenever you scroll, which is a useful first check before assuming a fault.
Tips to Improve
Test slow, deliberate scrolls and fast scrolls separately — some issues only appear at one speed.
If scrolling feels fine in general use but this test shows dropped events, try a different browser to rule out a browser-specific quirk.
Frequently Asked Questions
Most mice and trackpads fire more than one scroll event per physical gesture — this is normal browser and OS behavior, not a fault.
No — it only counts scroll wheel events as received by the browser, not low-level hardware metrics like polling rate or DPI.