01
Keyboard Test
Test keyboard keys, inspect repeated inputs and review a local test summary. Get clear…
Scroll Wheel Test
Tests scroll in all four directions, counts notches and tells a stepped wheel apart from a free-spinning or touchpad scroll.
Device Tests
Nothing uploaded
No sign-up
Free, unlimited
The test starts automatically — follow the prompts above.
In short
Scroll Wheel Test is a free online tool on inputtesthub.com that tests scroll in all four directions, counts notches and tells a stepped wheel apart from a free-spinning or touchpad scroll. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Scroll Wheel Test
- The test starts on its own — no button to press and nothing to install.
- Follow the prompt in the test panel and watch the readings update live.
- Press Reset to start over with a clean slate.
About the Scroll Wheel Test
The Scroll Wheel Test tests scroll in all four directions, counts notches and tells a stepped wheel apart from a free-spinning or touchpad scroll. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Diagnosing a wheel that scrolls the wrong way or skips.
- Checking horizontal scroll on a tilt wheel.
Frequently asked questions
My wheel sometimes jumps backwards. What causes that?
A dirty or worn optical encoder inside the wheel. It is the most common mouse fault after switch bounce, and on many mice the encoder can be cleaned or replaced.
Why does my touchpad show hundreds of tiny events?
Touchpads send smooth, fine-grained scroll deltas rather than the fixed jumps a notched wheel produces. The test reports which kind it is seeing.
Is the Scroll Wheel Test free?
It is free, with no account, no trial and no daily cap. Every device tests tool on inputtesthub.com works the same way: open the page and use it.
Is my data uploaded anywhere?
No. The Scroll Wheel Test runs entirely in your browser using JavaScript. Because the work happens locally, the page also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
When would I actually need the Scroll Wheel Test?
The most common reasons people reach for it: diagnosing a wheel that scrolls the wrong way or skips. Checking horizontal scroll on a tilt wheel. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Why does the test start on its own?
No installation, no extension and no driver. The Scroll Wheel Test uses the browser's own device APIs and begins as soon as the page loads, so there is nothing to press first. Press Reset at any point to start over with a clean slate.
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