Green-subpixel check
Look for dark, red, blue or white points on the green field.
Green Screen
Use a full-screen green background to inspect green subpixels, panel uniformity and suspicious pixels, or as a simple browser-based chroma background.
What is a green screen used for?
A green screen makes missing or incorrectly colored green subpixels easier to notice. Because green is visually bright on many displays, reduce hardware brightness if the screen feels uncomfortable.
✓ No installation✓ Full-screen support✓ Works on compatible devices
Useful checks with a green screen
Uniformity inspection
Check for darker bands, tint or inconsistent green across the panel.
Stuck-pixel retest
Compare the same suspicious location on multiple solid colors.
Simple chroma background
Use the full-screen green field for basic video background experiments.
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
Is this a professional chroma-key screen?
No. It is a browser-rendered green background. Reflections, brightness, screen texture and camera exposure affect keying quality.
Why is green very bright?
Green contributes strongly to perceived brightness on many displays. Lower your device brightness when needed.
Does the exact green depend on the display?
Yes. The page requests sRGB green, but actual output depends on the display, browser, color profile and settings.
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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