Screen Test
Colors, gradients and charts to check any screen.
Step through the solid colors first, then the brightness and gradient checks. Pick a chart below for a closer look.
Use your monitor or phone controls to raise the brightness. To come back, press Esc or click Exit full screen.
Touch grid
Position:
Ready.
Ready.
Every test runs inside your browser. Nothing you type, say, show or press is uploaded.
How to use this test
The screen test is a one-page check for any display: a laptop, external monitor, phone, tablet or TV. It steps through solid colors for dead and stuck pixels, a brightness and gradient check for banding and backlight problems, a touch grid on touch devices, and five test charts for uniformity, grayscale, contrast, sharpness and color steps.
Press Go full screen and step through the colors with Next, looking for dots that don't change. Carry on to the brightness and gradient step and turn your brightness up with the device controls. On a phone or tablet, trace the touch grid. Then press Esc or Exit full screen and pick each chart from the selector for a closer look.
What the results mean
Dots that keep one color are stuck or dead pixels. Visible bands in the gradient mean the panel or its settings can't show smooth shades. Bright corners on the black screen are backlight bleed. On the sharpness grid, every line should be crisp; blur means the display isn't running at its native resolution. Mild differences in the uniformity chart are normal on most panels.
Common questions
Should I test a monitor or a TV at its native resolution?
Yes. Set the operating system to the panel's native resolution first, otherwise the sharpness grid will look soft because of scaling and not because of the screen.
The gradient shows stripes.
That's banding. Some of it comes from the panel, some from settings such as a low color depth or heavy image processing. Try the monitor's default picture mode and check that the operating system is set to 8 bits or more per channel.
What is the touch grid for?
Dragging a finger across the whole grid shows any area where the touch layer no longer responds. It only appears on devices that report touch.