All-around check
A complete pass through the basics.
YOUR DISPLAY, UNDER A CLOSER LOOK
White screen.
A plain white screen you can open full size.
↗ No installation◉ Visual inspection⌂ Stays on your device
White
RGB 255, 255, 255YOUR TEST PATTERN
Start with white.
Select a color, then give it the whole screen.
← → Switch colorsEsc ExitF Fullscreen
Tap the pattern to show controls. No automatic cycling or flashing.
◎ You inspect the physical screen. Nothing is scanned or uploaded.Go at your own pace ↗
YOUR EYES. YOUR NOTES.
Keep a little record.
Save what you noticed, so you can compare later. One record per test, stored only in this browser.
⌂ Local to this deviceNo automatic result. Choose only what you actually observed.
A MORE FOCUSED LOOK
Something specific on your mind?
Choose a check for what you’re seeing.
Gray screen uniformity
Compare gray screen shades for bands, tint, and uneven areas.
Screen bleed (LCD)
Compare LCD black and near-black fields for edge light.
Dead pixel test
Fixed dark, bright, or colored points.
Screen burn-in
Lingering logos, shapes, or uneven tones.
OLED screen test
Compare gray and color fields on OLED or AMOLED screens.
LCD screen test
Compare familiar colors and gray levels on an LCD.
TAKE A MINUTE. TAKE A CLOSER LOOK.
How to use a fullscreen white screen
You do the observing.
We provide the patterns.
- 01
Select the white pattern to open it as large as your browser allows.
- 02
Use the full-screen control if your browser permits it. The fallback keeps browser controls visible.
- 03
If inspecting the panel, use a comfortable brightness and check that a suspected mark stays in the same physical place.
- 04
Exit at any time with Escape. This pattern sends no image or device information.
BEFORE YOU DRAW A CONCLUSION
Your screen check questions
Can I use this as a white background?
Yes. Select the white field and start fullscreen mode. The browser can keep its controls visible when true fullscreen is unavailable.
Does a white screen test measure my display’s brightness?
No. Your device’s brightness and color settings determine the output. The page only sends the digital white color value to the browser.
Can a white screen find dead pixels?
It can make a fixed dark point easier to notice. Compare the same location on black, red, green, and blue before drawing a conclusion.
MAKE SENSE OF WHAT YOU SEE
Put your observation in context.
Compare the clues, then return to the tool to repeat your check.
Instructions source-checked · ScreenCheckup pattern values and method. Manufacturer guidance explains the concepts; it does not certify this tool or your panel.
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