Dark-pixel inspection
Look for black or dim points that remain visible against white.
White Screen
Use a clean full-screen white background to inspect dark pixels, dust, tint, uneven brightness and panel uniformity.
What is a white screen used for?
A white screen makes dark or inactive pixels, dust marks, color tint and uneven brightness easier to notice. It is also useful as a temporary light background, but it does not replace calibrated display equipment.
✓ No installation✓ Full-screen support✓ Works on compatible devices
Useful checks with a white screen
Uniformity check
Compare the center, edges and corners for brightness or color differences.
Screen cleaning
Reveal dust, fingerprints and marks before cleaning the panel safely.
Light background
Use a bright neutral screen for tracing, product photography or video calls.
How to use this screen safely
- Clean the display gently according to the manufacturer’s instructions.
- Use your normal viewing distance and brightness first.
- Open full screen and inspect the center, edges and corners.
- Repeat the check with black, white, red, green, blue and gray backgrounds.
- Do not stare at an uncomfortable brightness or color for a prolonged period.
Important: This is a visual browser test. It cannot certify a display, identify the exact hardware cause, or replace professional measurement equipment.
Frequently asked questions
Can a white screen find every dead pixel?
It is best for dark pixels, dust and brightness variation. Run black, red, green and blue screens as well because some defects appear only on certain colors.
Does this change my monitor brightness?
No. The page displays white pixels; hardware brightness remains controlled by your device or monitor settings.
Is the white screen safe for OLED displays?
Brief testing at normal brightness is generally appropriate. Avoid leaving a bright static screen open for unnecessarily long periods.
Try another screen color
Run several colors because different pixel and uniformity problems appear on different backgrounds.
Explore more diagnostics
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Move between screen, camera, audio and device checks without returning to the homepage.
Dead Pixel TestInspect solid colors for dead, stuck, bright or dark pixels.
Touch Screen TestCheck touch coverage, dragging continuity and dead zones.
Keyboard TesterTest a full-size keyboard and confirm every key press.
Mouse TesterTest buttons, wheel, movement, dragging and double-clicks.
Audio TesterCheck speakers, stereo channels, tones and microphone input.
Camera & WebcamTest built-in, USB, phone, tablet and compatible TV cameras.
Microphone TesterView microphone levels, waveform, recording and playback.
Pixel ExerciserExercise a suspected stuck-pixel area with changing colors.
Gradient TestInspect gradients, tonal transitions and visible banding.
Brightness & ContrastCheck black levels, white saturation and contrast separation.
Screen Size TestView viewport, resolution, pixel ratio and display data.
Text SharpnessInspect text rendering, browser scaling and clarity.
Motion & GhostingObserve motion blur, ghosting and response behavior.
Resolution & ScalingCheck screen resolution, CSS pixels and scaling.
Device InformationReview screen, browser, hardware and platform information.
Browser CapabilityCheck which browser APIs and hardware features are supported.
Network TestCheck connection status, latency and estimated download speed.
GPS & LocationTest browser geolocation, accuracy, altitude and speed.
Sensor TesterTest orientation, motion, acceleration and rotation sensors.
Multi-Touch TesterTrack multiple touch points, pinching and rotation gestures.Screen Color ToolsOpen exact full-screen color pages for pixel, uniformity and lighting checks.Response Time TestObserve ghosting, blur and pixel-transition behavior at several speeds.Stylus Drawing TestCheck pen, touch, pressure, tilt and drawing continuity in your browser.
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