Dirty screen effect
Look for cloudy or dirty-looking patches during a uniform gray field.
Gray Screen
Use a neutral gray field to inspect dirty screen effect, tint, vertical banding and subtle brightness variation.
What is a gray screen used for?
A mid-gray screen is useful for finding subtle panel non-uniformity that may be difficult to see on pure black or white. Slow eye movement across the panel can reveal bands, blotches or color tint.
✓ No installation✓ Full-screen support✓ Works on compatible devices
Useful checks with a gray screen
Vertical banding
Inspect for fixed vertical strips, especially on OLED and large TVs.
Color tint
Compare whether areas look greenish, pinkish, bluish or yellowish.
Brightness uniformity
Check the center, corners and edges at normal viewing distance.
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
What gray level is shown?
The page uses a mid-gray sRGB value of #808080. Actual luminance depends on your display and settings.
What is dirty screen effect?
It is a visible non-uniform pattern that can resemble smudges or clouds, especially during camera pans or uniform content.
Can cleaning remove gray-screen patches?
Surface marks may clean off, but internal panel uniformity issues will remain. Follow the manufacturer’s cleaning instructions.
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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