Input Lab Mouse

Mouse Scroll Test

Test a mouse wheel or touchpad online with scroll direction, event rate, normalized delta, total distance and a live trace for spotting skipped or reversed scroll input.

Runs locally No account Repeat freely
Loading Mouse Scroll Test…
Keep testing
Double Click Latency TestMeasure the interval between clicks and flag switch bounce. Browser Input Latency TestEstimate event dispatch delay for mouse, key and touch input. Mouse Rate TestEstimate delivered pointer events per second and interval stability. Reaction TestMeasure visual reaction time across repeatable browser rounds.
View all Input Lab tools

Mouse Scroll Test Guide

How to use the mouse scroll test

Place the pointer over the dedicated zone and scroll steadily in both directions. Page scrolling is blocked only inside that surface so the rest of the site remains usable.

Understanding the results

The trace shows delivered wheel deltas over time. Reversed spikes, long gaps or inconsistent steps during a steady wheel motion may justify another hardware or driver check.

What this browser tool can measure

Operating systems and browsers can accelerate, coalesce or convert wheel units. Pixel-normalized distance is useful for comparison but is not a physical notch count.

Private by design

The interactive work happens locally in this browser. No account is required, and test inputs are not sent away to calculate the result.