Dead pixels, unresponsive mouse buttons, one-sided earphone audio, blurry camera, inaccurate phone orientation, a slowing computer, or stuttering games — many hardware issues can be preliminarily diagnosed without opening the device. ToolWa has collected 17 web-based hardware testing tools across seven categories — monitors, processors, mice, keyboards, gamepads, microphones, speakers/headphones, cameras, touchscreens and sensors. Open your browser to use them; all tests run locally and no data is uploaded.
8 tests — solid color, gradient, greyscale, bleed — to fully check dead pixels, bright dots and color deviation
High-frequency random-color loop animation to stimulate stuck pixels; works on some
UFO Test principle to detect real refresh rate and frame drops, with a report
One click to read resolution, refresh rate, color depth, gamut, PPI and more
Test buttons, wheel, movement trajectory and click speed (CPS) for full mouse performance
Test every key, multi-key rollover (NKRO), typing and click speed
Test buttons, dual-stick deadzone and travel, triggers and vibration motors
Test multi-touch, stroke dropouts, touch deadzone, gestures and pressure
Real-time volume, waveform, spectrum, noise floor and channels, with recording playback
Test left/right channels, frequency response, hearing-threshold curve, phase and distortion
Check sharpness and focus, dead pixels and noise, white balance, with capture and device info
Vibrate the device via the Vibration API, with custom duration and rhythm
8 dimensions of integer/float and prime-sort speed, with separate single- and multi-core scores
WebGL real-time rendering to stress GPU throughput, fill rate and triangle performance, reading model and extensions
Dynamic rendering to stress graphics performance; weak devices may freeze
The stronger the browser/device, the more fish appear on screen
Pick an entry by the problem you hit — faster than browsing tools one by one.
An 8-step checklist to check dead pixels, backlight bleed, refresh rate and color gamut in 20 minutes
Confirm whether it is a dead pixel, then try to fix it
Test each key one by one to find which one does not respond
Stick deadzone, audio pickup and touch dropouts can all be tested in the browser
Run a benchmark to see how your GPU and browser actually perform
Each category lists the most practical checkpoints and direct tools. Monitor inspection has many steps, so it is expanded separately; the rest are quick-reference.
→ Mouse Test · Keyboard Test · Gamepad Test · Touchscreen Test
→ CPU Test · GPU Test · Poison Mushroom · Fish Tank
The monitor is one of the few components where skipping inspection costs you: panel variance is large and gaming specs are often exaggerated (the advertised 1ms is usually MPRT black-insertion, not true grey-to-grey). This flow needs no pro gear, takes 20 minutes in a browser, and is best done the day you receive it.
Fill the screen with pure red, green, blue, white and black in turn, scanning each color for pixels that never light up (dark dots) or always stay lit (bright dots). Pure black also reveals edge bleed. Wipe the screen first — dust is easily mistaken for a dead pixel; dim the lights.
→ Open "Online Screen Test"(9 solid-color screens, 32 test items total)
Show pure black in a dark room and watch the corners for a glow. Glow that moves with viewing angle is IPS Glow (normal panel behavior); fixed, visible head-on bleed is real backlight bleed. Fixed bleed larger than a coin and noticeable daily is a defect.
Confirm the OS output resolution equals native (2K is 2560×1440, not 1920×1080); then measure the real refresh rate, not just the system number. Overclocked high-refresh modes usually need manual OSD enabling; use a DP cable for high refresh.
Use greyscale gradients to check shadow detail and smoothness, and saturation charts for over-saturation or tint. For design work switch to sRGB mode to recheck; persistent obvious tint uncorrectable via OSD is a defect.
Check the real gamut: design panels want 99% sRGB or 95% DCI-P3; "72% NTSC" ≈ 100% sRGB, smaller-sounding but fine. For HDR verify true support, not just a logo on the box.
→ Monitor Specs(reads gamut, color depth, HDR support)
Grid and fine-line patterns check whether the image is straight and whether corners are sharp or soft. Especially useful for projectors and old monitors.
Watch trailing behind fast-moving objects to judge real response speed. Compare Overdrive levels one by one — too high causes inverse ghosting; mid is usually best. Severe VA black-smear hurting games is returnable.
Solid-color and gradient screens check for "two-tone" panels (left/right tint mismatch) and brightness unevenness — key for designers. Measure bleed/ghosting in a dark room and uniformity in normal light for realistic results.
Before rushing to return, some stuck pixels can be revived — try Dead Pixel Fix.
| Symptom | What it is | Fixable? | Advice |
|---|---|---|---|
| Bright dot | a pixel that always stays lit in any image | sometimes | 先试 Dead Pixel Fix, if ineffective go to after-sales |
| Dark dot | a pixel that never lights up in any image | generally no | if count meets the standard, request a replacement |
| Colored dot | a subpixel stuck on one color | sometimes | same as bright dot |
| IPS Glow | corners glow white, moves with angle | no action | panel trait, normal |
| Fixed bleed | edge glow, does not change with angle | no | if too large, request a replacement |
| Two-tone panel | left/right color temperature mismatch | no | quality issue, replaceable |
| Dust/stain | gone after a wipe | — | wipe the screen before testing to avoid misjudgment |
Tip: On "how many dead pixels are normal" — the common "within 3 is acceptable" is only a rough industry rule and standards vary by brand. Safest is to read the after-sales policy before buying, inspect early after delivery, and the 7-day no-reason return is usually easier than a service send-in.
工具哇! 
