Adjustable grey screen for monitor calibration, photography mid-tone reference, display uniformity testing, and eye strain reduction. Every shade from 5% to 95%.
Visit whitescreen.cc/gray-screen — 50% grey loads by default.
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Choose a level
Click a preset grey level or use the slider for any value.
3
Go fullscreen
Click "Go Fullscreen" for full display calibration or testing.
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Exit anytime
Press ESC or click Exit.
Quick reference
At a Glance
Default
50% grey (RGB 128,128,128) — standard mid-tone reference.
18% grey
~18% luminance ≈ RGB 118,118,118 on a calibrated display.
Cost
100% free. No login, no ads.
Exiting
ESC key, Exit button, or F11.
Mobile
Fully works on iOS and Android.
Privacy
All in-browser. Nothing uploaded.
Common questions
FAQ
A grey screen is used for monitor calibration, photography 18% grey reference, display uniformity testing, reducing eye strain (less fatiguing than pure white), and checking mid-tone pixel faults.
18% grey reflects exactly 18% of incident light — the middle exposure point camera meters are calibrated to. Photographers use a grey card to set accurate exposure and white balance. A calibrated monitor displaying ~18% grey can serve as a reference.
Use 50% grey (RGB 128,128,128) for gamma calibration. Use 20% grey for shadow reproduction testing. Use 75–80% for highlight range testing. Our slider lets you set any exact level.
Mid-grey is generally less fatiguing than pure white, especially in dim environments. Pure white at full brightness causes more eye strain over long periods. A 60–70% grey provides comfortable reading light.
Pure white and pure black test the extremes of your display, but grey tests the middle — and that is where most image detail lives. A mid-grey screen reveals backlight uniformity, gamma response, shadow crush, and highlight clipping in ways that extreme-value test screens cannot. Professional monitor calibrators always include multiple grey levels in their test suite.
18% grey in photography
Camera light meters are calibrated to produce a correct exposure for an 18% reflectance grey card. Placing an 18% grey card (or a monitor showing calibrated 18% grey at approximately RGB 118,118,118 on a calibrated display) in the scene lets you set a reliable exposure baseline. This is particularly useful for RAW photography where accurate exposure minimises post-processing.
Grey screen for reduced eye strain
Many users find that working against a mid-grey background is less fatiguing than a bright white screen, especially in dim environments. Reducing screen brightness to 60–70% grey rather than full white can reduce glare and improve comfort for extended reading or work sessions.
Grey for display uniformity testing
A 50% grey fullscreen is excellent for identifying backlight bleed, clouding, and uneven brightness on LCD monitors. Spots that look brighter or darker than the surrounding grey indicate backlight non-uniformity. Combine with our Black Screen for shadow uniformity and White Screen for highlight uniformity.