Tool collection

Monitor Tests

Monitor Tests help you visually inspect a screen and compare its appearance across display settings. They’re useful when checking a new or secondhand monitor, reviewing a screen you already own, or looking into a visible display concern.

Choose a pattern that matches what you want to examine, then use the results as a first-pass visual check rather than a calibrated measurement.

Tools in this collection

Monitor Tests

Dead Pixel Test

Dead Pixel Test displays solid-color patterns to help you visually check a monitor, laptop, or phone for dark, bright, or unusual subpixels. Use it for a quick inspection before buying a screen or while its return period is open.

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Monitor Tests

Monitor Test

Monitor Test displays patterns for checking a new or used screen, comparing display settings, and spotting visible irregularities. Use it to note concerns before deciding whether a display needs closer attention.

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Monitor Tests

Screen Uniformity Test

Screen Uniformity Test displays solid white, black and gray patterns so you can visually check a monitor for uneven brightness or tint. Use it when assessing a new or used display or comparing picture settings.

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Monitor Tests

OLED Gray Test

OLED Gray Test displays dark gray patterns to help you inspect an OLED screen for visible banding, tint, or uneven tones. Use it to check a new or used display or compare its settings.

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Monitor Tests

Gradient Test

Gradient Test displays grayscale and red, green, and blue ramps so you can check a monitor for visible banding or uneven transitions. Use it to inspect a new or used screen or compare display settings in your browser.

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Monitor Tests

Black Level Test

Black Level Test displays labeled near-black patches against a black background so you can check whether a monitor reveals shadow detail. Use it to compare a new or used screen or review changes to its picture settings.

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Monitor Tests

White Level Test

White Level Test displays near-white patches against a white background so you can check whether a monitor preserves visible highlight detail. Use it to inspect a new or used screen or compare display settings, not as a calibrated brightness measurement.

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Monitor Tests

Sharpness Test

Sharpness Test displays fine-line, grid, checkerboard and text patterns so you can inspect monitor clarity, compare sharpness settings and notice visible rendering issues.

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Monitor Tests

Stuck Pixel Test

Stuck Pixel Test displays solid color fields so you can inspect a screen for subpixels that stay an unexpected color. Use it when checking a new or secondhand display, or after changing display settings.

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Monitor Tests

Backlight Bleed Test

Backlight Bleed Test displays black and dark-gray fields so you can inspect a monitor for glow around its edges. Use it to visually check a new or used screen or compare display settings.

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Monitor Tests

Brightness Test

Brightness Test displays near-black, near-white, and gray steps so you can compare screen visibility while adjusting brightness with your monitor or laptop controls. Use it to check a display that looks too dim or washed out, or to compare settings by eye.

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Monitor Tests

Contrast Test

Contrast Test displays dark and bright patches against reference backgrounds so you can check whether a screen keeps shadow and highlight details visible. Use it to compare settings or inspect a new or used monitor.

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Monitor Tests

Gamma Test

Gamma Test shows alternating black-and-white lines beside solid gray references so you can visually compare a display’s gamma appearance. Use it as a quick check when reviewing monitor settings, not as a calibrated measurement.

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Monitor Tests

Color Banding Test

Color Banding Test displays grayscale and RGB ramps so you can check a monitor for visible steps instead of smooth transitions. Use it to inspect a new or used screen or compare display settings.

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Monitor Tests

Response Time Test

Response Time Test displays moving gray targets at three speeds so you can compare how dark-to-light transitions look on a monitor. Use it to spot visible smearing or differences between display settings, not to get a calibrated response-time number.

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Monitor Tests

Ghosting Test

The Ghosting Test displays a moving high-contrast target so you can inspect visible trails and compare motion at different speeds. Use it to check a new or used monitor or compare display settings by eye.

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Monitor Tests

Text Clarity Test

Use Text Clarity Test to compare text at different sizes and view line patterns on your screen. It can help you spot visible clarity differences when checking a display or comparing settings.

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Monitor Tests

Monitor Test Patterns

Monitor Test Patterns displays visual grids, lines, text, gradients, and level patches so you can inspect a screen and compare display settings. Use it as a first-pass check for visible irregularities on a new or used monitor.

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Monitor Tests

Refresh Rate Test

Refresh Rate Test displays moving references so you can compare how a screen behaves at different settings. Use it to check a new or used display and see browser-reported motion timing.

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Monitor Tests

OLED Screen Test

Use OLED Screen Test to compare black, low-gray, white and checkerboard fields on an OLED display. It helps you spot visible tint, retention or unevenness during a quick visual check.

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Monitor Tests

HDR Test

Use HDR Test to view your browser’s dynamic-range and gamut reports alongside labeled SDR patterns. It offers a quick visual way to compare tonal detail on a display, not a certification of HDR performance.

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Monitor Tests

Color Depth Test

Color Depth Test displays ramps with 256, 64 and 16 requested channel levels so you can compare how color gradations appear on a screen. Use it to look for visible steps or banding and compare display settings, not to get a calibrated bit-depth measurement.

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Monitor Tests for common screen checks

Checking a new or used display: Start with Monitor Test for a broad look at patterns and visible irregularities, or use Monitor Test Patterns for grids, lines, text, gradients, and level patches.
Looking for pixel issues: Use Dead Pixel Test to spot dark, bright, or unusual subpixels, and Stuck Pixel Test to look for subpixels that stay an unexpected color.
Checking uneven brightness or tint: Try Screen Uniformity Test with white, black, and gray patterns. For edge glow on a monitor, use Backlight Bleed Test.
Inspecting an OLED screen: Use OLED Gray Test to look for banding, tint, or uneven dark-gray tones, or OLED Screen Test to compare black, low-gray, white, and checkerboard fields.
Checking smooth color transitions: Gradient Test and Color Banding Test show ramps that can reveal visible steps or uneven transitions.
Reviewing shadow and highlight detail: Use Black Level Test for near-black patches and White Level Test for near-white detail.
Comparing clarity: Sharpness Test shows fine lines, grids, and text; Text Clarity Test lets you compare text sizes and line patterns.
Checking motion by eye: Use Ghosting Test to look for trails, or Response Time Test to compare moving gray targets at different speeds.

How to choose

Start with a general test if you’re not sure what to look for, then switch to a focused pattern when you notice a specific issue. For pixels, choose the dead-pixel or stuck-pixel check based on whether you’re looking for dark or bright irregularities versus a subpixel that holds an unexpected color.

For tonal detail, use the black- or white-level pattern rather than relying only on a general brightness check. For motion, the Ghosting Test focuses on visible trails, while the Response Time Test compares dark-to-light transitions at multiple speeds. These tools show visual results in your browser; they don’t provide calibrated measurements or certify display performance.

Related collections

Color Screens

Color Screens give you a quick way to fill a display with a solid shade for simple lighting, photo and video backdrops, cleaning, or visual checks. They’re useful for anyone who wants a ready-to-show color without opening an image editor, from people setting up a video call to those checking a monitor.Choose a preset color for a quick result, or use a custom shade when you have a particular color in mind. Open a screen fullscreen when you need a broad field of color, or use the display as a simple reference while you work.

Screensavers

Screensavers give an idle browser display motion, a clear time display, or a distinct visual theme. This collection is useful for people setting up a spare monitor, stream intermission, shared room, or waiting area; the screensavers run locally and pause when the tab is hidden.

Screen Simulators

Screen Simulators provide fictional on-screen scenes for videos, presentations, screenshots, and demonstrations. They’re useful for creators, presenters, and anyone who needs a visual prop without putting a real update, meeting, or connection problem on screen.These browser-based displays are simulations, not system tools: choose a scene that suits your example, then use it as a harmless visual backdrop or prop.

Background Generators

Background Generators help you create and download images for wallpapers, presentations, and other design projects. Choose a simple color, a textured or patterned look, or a custom wallpaper layout, then set the image dimensions to fit your needs.

Timers & Lighting

Timers & Lighting tools help you manage time, structure focused work, and use your display as a light source. They’re useful for students, home workers, instructors, and anyone who wants a simple browser-based timer or a little extra light.