Hardware Test

Updated

Monitor Test

This screen test runs full-screen colors, gradients, and pixel patterns that show the common faults of any screen.

Opens full screen. Click, tap, Space, or Right Arrow for the next pattern, Left Arrow to go back, Esc to close. Patterns change only when you ask, with no flashing.

Jump to a Pattern

Screen Resolution
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Pixel Ratio
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Color Gamut
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HDR
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Refresh Rate
Measuring…

As reported by your browser. Browser zoom and scaled display modes change the resolution shown, so it can differ from your screen's native resolution. The refresh rate is an estimate from frame timing; power saving can lower it.

How to Use It

What Each Pattern Shows

PatternWhat to Look For
Solid colorsDead, stuck, or hot pixels; uneven color
10% GrayBacklight bleed and clouding, in a dark room
GradientsBanding: visible stripes instead of a smooth fade
Gray StepsCrushed blacks or clipped whites: steps that merge
Checkerboard and gridScaling and sharpness: should look even and crisp
TextBlur or color fringes on small text

For a quick check of a new screen's pixels only, use the dead pixel test. If a faint outline of something you closed stays on the solid colors, read how to check for screen burn-in.

Fixes

Blurry or Stretched Image

Set the resolution in your display settings to the monitor's native resolution, and scaling to 100% or 125% on Windows. The checkerboard should then look an even gray.

Banding in Gradients

Set color depth to 8-bit or 10-bit in your graphics settings, and use a cable that supports your resolution and refresh rate together.

Backlight Bleed

Mild bleed is normal on many LCDs. Heavy bleed on a new monitor is worth reporting to the seller within the return period. To tell it apart from the glow every IPS panel shows at an angle, see backlight bleed vs IPS glow.

Guides

More Tools

Questions

How do I test my monitor?

Press Start Monitor Test to open full-screen patterns, and step through them with a click, Space, or the arrow keys. Each pattern shows what to look for, from dead pixels to banding and backlight bleed.

How do I check for backlight bleed?

Turn the room lights off, set the screen to full brightness, and open the 10% Gray pattern. Brighter patches along the edges or corners are backlight bleed. Some glow is normal on IPS panels, especially from an angle.

What does banding in a gradient mean?

Visible stripes in a smooth fade mean the screen, cable, or graphics settings show fewer shades than the gradient has. Check the color depth setting (8-bit or higher) and that the refresh rate isn't forcing a lower depth.

Is my screen running at its full refresh rate?

The test estimates it from how often the browser draws frames. If a 144 Hz monitor shows about 60 Hz, set the refresh rate in your display settings and check the cable supports it (DisplayPort or a recent HDMI).

Does it work on phones and TVs?

Yes. On iPhone the page covers the screen instead of using true full screen: turn the phone sideways and scroll the browser bars away. On a smart TV, open the page in its browser.

What is a screen test?

A screen test shows full-screen colors and patterns so you can spot dead pixels, backlight bleed, uneven brightness, and scaling problems. This page is one.