Online Scroll Test
Diagnose mouse wheel jitter, reverse scrolling, and unstable strokes online. Choose a duration, scroll in one direction inside the test stage, and the page will generate a visual diagnostic report automatically.
Choose a duration, start the test, keep scrolling naturally in the area below, and the report will be generated automatically when the timer ends.
Workflow 1
Choose a duration
Use a short run for a fast health check, then rerun for 30 to 60 seconds if needed.
Workflow 2
Keep scrolling
Scroll continuously in one direction so the detector can judge signal consistency more accurately.
Workflow 3
Read the report
Check the verdict and anomaly counts first, then use the charts to confirm what happened.
Test Duration
Ready to Test
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Start with a short run for a quick check, then use a longer duration to verify consistency.
Test Duration
Start with a short run for a quick check, then use a longer duration to verify consistency.
Start and Report
You can pause or resume the current run at any time. When the timer ends, the page will automatically jump to the report.
The report is generated automatically. Start with the verdict cards, then review charts and detailed event rows.
Keep scrolling in one direction. Reversing direction during the run will reduce report accuracy.
Reset clears the current session and report.
Scroll Test Area
Keep scrolling in one direction inside the test stage to collect samples. You can also double-click the stage to start, pause, or resume quickly.
Start Test
Keep scrolling in one direction. Reversing direction during the run will reduce report accuracy.
Scroll Test Graph
Track the live wheel pattern while keeping the most important speed and peak signals in view.
Scroll Test Dashboard
Wheel Speed
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Last DeltaY
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Vertical Scroll
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DeltaY Max Value
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Simple steps to use Scroll Test?
Follow these three steps to complete a wheel-health check. The flow is now simpler: start, scroll, and review the report automatically.
Start the Test
Choose a duration first, then press the start button. You can also double-click the test stage to begin immediately.
Scroll in One Direction
Keep scrolling in one direction inside the test stage and avoid switching direction repeatedly for a cleaner diagnosis.
Review the Auto Report
When the timer ends, the page automatically generates the report and scrolls to it. Start with the verdict, then review charts and detailed events.
Start the Test
Choose a duration first, then press the start button. You can also double-click the test stage to begin immediately.
Scroll in One Direction
Keep scrolling in one direction inside the test stage and avoid switching direction repeatedly for a cleaner diagnosis.
Review the Auto Report
When the timer ends, the page automatically generates the report and scrolls to it. Start with the verdict, then review charts and detailed events.
Metric Guide
Scroll Test Metrics Guide
The Scroll Test Dashboard turns raw wheel input into a set of real-time metrics that are easier to interpret. The primary metrics are for fast health checks, while the secondary metrics help diagnose jitter, reverse scrolling, and unwanted horizontal input in more detail.
Wheel Speed
Shows how many wheel events the browser received during the most recent second. Higher values mean denser input. It is not the same as hardware polling rate, but it is very useful for spotting drops, gaps, or unstable scrolling rhythm.
Last DeltaY
Shows the most recent vertical wheel delta. In a clean one-direction test, the sign should stay consistent. If it flips direction frequently while you scroll one way, that is often a sign of unstable wheel input.
Accuracy ScrollY
Shows the accumulated vertical scroll amount for the current session. During a one-direction test, it should build steadily in the same direction. Slow growth or visible cancellation can indicate reverse ticks or jitter.
DeltaY Max Peak
Shows the strongest positive vertical spike seen during the session. It helps you spot unusually sharp bursts in the wheel signal, especially when you compare it with the live chart shape.
DeltaMode
Shows how the browser is reporting wheel units, usually in pixels, lines, or pages. It is not a quality score by itself, but it changes the scale of the delta values, so it matters when interpreting the rest of the dashboard.
Last DeltaX
Shows the most recent horizontal wheel delta. Most basic wheel tests focus on vertical motion, so repeated DeltaX activity without intentional horizontal input can point to tilt-wheel behavior, touch gestures, or extra noise.
Accuracy ScrollX
Shows the accumulated horizontal scroll amount for the current session. This helps confirm whether horizontal movement is a small occasional artifact or a persistent secondary input source that affects the reading.
DeltaY Min Peak
Shows the strongest negative vertical spike seen during the session. During one-direction scrolling, repeated deep negative peaks can be a strong clue that the wheel is producing reverse jumps or dirty signal bursts.
Algorithm Analysis
Algorithm 1: Basic Signal Reversal (Basic Pattern)
Mechanism：Detects whether a simple negative signal appears in a Positive -> Positive -> Positive sequence. Like suddenly shifting into reverse gear once while driving forward.
Normal: Most mice have fixed signals per notch (e.g., 100). The straight line represents stability.
Abrupt reverse spike, typical contact oxidation.
Algorithm 2: Stroke Consistency
Mechanism：Simulates real physical motion. A complete stroke should be like a mountain peak: speed goes from slow to fast and back to slow. If while rapidly 'going downhill,' the chart suddenly shows you 'teleported' to the sky (negative value), this is the advanced fault captured by Algorithm 2.
Normal Stroke: Continuous scrolling produces a series of stable forward signals (straight line or steps).
Abnormal Stroke: During a single stroke, continuous reverse noise is mixed in (square wave pulses).
Purpose of Scroll Test
Mouse scroll test is a very common hardware test. Mouse scroll wheels have many efficiency-enhancing uses in practice, so maintaining a normal mouse wheel and performing scroll test is an essential operation for improving operational efficiency.
Web Page Zoom
Ctrl + Scroll Wheel quickly enlarges or reduces webpage fonts, images, and layout; more intuitive than menu operations, suitable for reading pages of different sizes.
Open New Links
Directly open web pages in a new tab without right-clicking and selecting 'Open in New Tab,' making multi-page browsing more efficient.
Close Tabs
Middle mouse button (scroll wheel click) on a tab directly closes the browser tab, avoiding switching to the target tab and clicking '×,' multiplying efficiency.
Horizontal Scrolling
Shift + Scroll Wheel scrolls left and right on wide pages (such as tables, images, video timelines), replacing dragging the bottom scrollbar.
Why scroll test is important?
Although the scroll wheel is just a small component of the mouse, it is involved in over 90% of daily operations — from browsing web pages and editing documents to professional design and gaming. When the wheel malfunctions, operational efficiency decreases, the user experience becomes fragmented and choppy, hand operation burden increases, and prolonged use more easily leads to fatigue.
| Scenario | Impact | Detailed Description |
|---|---|---|
| Web Browsing | Unable to smoothly scroll pages up and down | When reading news, forums, or social media, the scroll wheel is the primary means of page navigation. Once the wheel becomes unresponsive or jumps severely, you need to frequently drag the right-side scrollbar, resulting in large hand movement distances, frequent operation interruptions, and an extremely poor reading experience. |
| Document Editing (Word, PDF, Excel) | Difficulty reading or locating content | When the scroll wheel fails to function properly while editing long documents, finding paragraphs or table positions becomes tedious. Especially when viewing PDF documents, having to drag the scrollbar for every page turn significantly reduces efficiency. |
| Programming/Code Review | Reduced code browsing efficiency | Developers typically use the scroll wheel to quickly browse code, logs, or configuration files. An unresponsive wheel causes stuttering, line skipping, or inaccurate positioning during scrolling, seriously affecting debugging and problem-finding efficiency. |
| Image Viewing | Unable to zoom or scroll to view large images | In image viewers, Photoshop, and similar software, the scroll wheel is commonly used to zoom or move images up and down. Wheel malfunction makes it impossible to precisely adjust zoom levels, making detail viewing operations clumsy. |
| Gaming Operations | Abnormal weapon switching or camera control | In shooter or MMO games, the scroll wheel is often used to switch weapons, items, or zoom the map. Unresponsiveness causes misoperations (such as selecting the wrong weapon), and wheel drift may cause the screen to zoom unexpectedly, affecting game experience or even match results. |
| Scroll Acceleration or Inertia Loss | Abnormal scrolling speed, lack of smoothness | Some mice support 'inertial scrolling,' and when it fails, scrolling becomes abrupt, page movement distance becomes unpredictable, requiring frequent scrolling to reach target positions. |
| Wheel Sticking or Drift | Page automatically bounces up and down | When the wheel sensor is damaged, 'ghost scrolling' phenomenon may occur, causing pages to automatically scroll or jump randomly, leading to click misalignment, text selection difficulties, and an extremely poor user experience. |
| 3D Modeling / CAD Software | Limited camera operations | In software like Blender and AutoCAD, the scroll wheel controls camera zoom and pan. If the wheel stutters, model browsing becomes difficult, camera jumps occur, and precise modeling becomes impossible. |
| Video Editing/Audio Editing | Timeline zooming and navigation difficulties | In editing software (such as Premiere, Audition), the scroll wheel is commonly used to zoom the timeline or pan the view. Wheel failure makes frame positioning and clip fine-tuning exceptionally time-consuming, with reduced precision. |
Frequently Asked Questions
Quick answers to common questions about scroll wheel test.
This usually happens because the test has not been officially started yet, so the tool is not collecting mouse wheel events. To start the test, click the “Start Test” button below the “Scroll Test Area” on the left side of the tool, or simply double-click the mouse icon inside the “Scroll Test Area”.
Mouse wheel issues can be caused by several factors, such as low battery power, a worn or damaged scroll wheel, or dust buildup inside the mouse.
No. Scroll Test does not support mobile devices because mobile devices do not have a physical mouse wheel. Although JavaScript can listen to the onScroll event on mobile, it cannot detect wheel events. These two are fundamentally different: Mobile scrolling = finger swiping + inertia scrolling, while PC mouse wheel scrolling = discrete physical step-based input.
If you are using a wireless mouse, first check whether the issue is caused by low battery power. Try replacing the battery with a fully charged one and test again. If the battery is not the issue and the scroll wheel behavior is only slightly abnormal, disconnect the mouse and use a hair dryer (cold air only) to blow dust out of the gaps around the scroll wheel. You can also clean the gaps using a cotton swab with a small amount of alcohol. Let the mouse dry completely before using it again. If your mouse shows issues such as reverse scrolling or jumpy scrolling, you can open the mouse and clean the scroll wheel encoder. If the mouse is expensive, we recommend taking it to a professional repair service.
To achieve the most accurate test results, please follow these guidelines: During the test, scroll the mouse wheel in one direction only. Avoid scrolling too frequently. Keep an interval of at least 300 milliseconds between consecutive scrolls. This helps prevent the testing algorithm from misinterpreting the scrolling behavior.