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White Screen
Fills your entire screen with solid white. Cleaning the screen, spotting dust and dark…
38 tools · free · no account
Screen & Display Tests
The checks people actually run on a new monitor, laptop, phone or TV. Full-screen colour fills for dead and stuck pixels, motion patterns for ghosting and response time, gradients for banding, and measured tests for refresh rate and frame pacing. Best viewed fullscreen with the lights low.
38 shown
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Black Screen
Fills your entire screen with solid black. Finding stuck pixels, backlight bleed and IPS glow…
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Red Screen
Fills your entire screen with solid red. Checking the red sub-pixels across the panel and…
004
Green Screen
Fills your entire screen with solid green. Checking green sub-pixels — the channel the eye is…
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Blue Screen
Fills your entire screen with solid blue. Checking blue sub-pixels and spotting the colour…
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Cyan Screen
Fills your entire screen with solid cyan. Testing green and blue together, which often exposes…
007
Magenta Screen
Fills your entire screen with solid magenta. Testing red and blue together and checking for…
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Yellow Screen
Fills your entire screen with solid yellow. Testing red and green together — the brightest…
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Grey Screen
Fills your entire screen with solid grey. The best single colour for judging panel uniformity…
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Orange Screen
Fills your entire screen with solid orange. A warm mid-tone that shows tint shifts across the…
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Purple Screen
Fills your entire screen with solid purple. A dark saturated field, useful for checking colour…
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Pink Screen
Fills your entire screen with solid pink. A light saturated field for checking uniformity in…
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popular
Dead Pixel Test
Cycles your screen through solid white, black, red, green and blue so dead and stuck pixels…
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Stuck Pixel Test
Steps through solid colours to find pixels latched on in red, green or blue — the kind that…
015
Stuck Pixel Fixer
Flashes rapid colour changes over a stuck pixel to try to free it. Works on stuck pixels only…
016
Backlight Bleed Test
Shows a pure black screen so you can see light leaking from the edges of an LCD panel and…
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Screen Uniformity Test
Cycles flat grey and colour fields to reveal brightness and tint variation across the panel —…
018
popular
Refresh Rate Test
Measures your display's real refresh rate from actual frame timings, and reports how…
019
Frame Rate Test
Shows frames per second and frame-time consistency, so you can see stutter and dropped frames…
020
popular
Monitor Ghosting Test
Moves high-contrast squares across the screen at a speed you choose, so you can see trailing…
021
Response Time Test
Runs moving patterns at increasing speeds so you can judge pixel response by eye and find…
022
Colour Banding Test
Displays smooth gradients so you can see whether your panel renders them cleanly or breaks…
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Contrast Test
Shows near-black and near-white step wedges so you can check your display is not crushing…
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Gamma Test
A step-and-stripe pattern that lets you read your display's gamma by eye and check it against…
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Screen Sharpness Test
One-pixel line and checkerboard patterns that reveal scaling, over-sharpening and text clarity…
026
popular
Screen Resolution Checker
Shows your device and CSS resolution, pixel ratio, aspect ratio, colour depth and pixel…
027
Screen Burn-in Test
Steps through solid colour fields to reveal ghosted images left behind by static content on…
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Screen Pixel Refresher
Runs a fast full-screen noise pattern that drives every sub-pixel through its whole range…
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Screen Flicker Test
A moving high-contrast pattern that makes backlight flicker visible, so you can tell whether…
030
Colour Discrimination Test
Arrange coloured tiles into a smooth hue order to check how finely you and your display can…
031
Screen Tearing Test
Scrolls high-contrast bars so you can see whether your display tears — the horizontal seam…
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Adaptive Sync (G-Sync / FreeSync) Test
Sweeps the frame rate up and down so you can see whether your variable-refresh display is…
033
Overscan & Screen Geometry Test
A grid with corner brackets and an edge border that reveals overscan, off-centre images and…
034
Sub-pixel Layout Test
Magnified one-pixel lines that let you identify RGB, BGR or pentile sub-pixel order and fix…
035
Colour Bit Depth Test
The same grey ramp quantised to 6, 8 and 10 bits, so you can tell a true 8-bit panel from a…
036
Scroll Smoothness Test
Measures the gaps between scroll frames so you can see stutter as numbers instead of guessing…
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Pointer Latency Test
Draws a trail of your last twelve reported pointer positions, making display and browser…
038
Stylus & Pen Pressure Test
Reads pressure and tilt from a graphics tablet, Apple Pencil or Surface Pen, and shows the…
About these screen & display tests
The checks people actually run on a new monitor, laptop, phone or TV. Full-screen colour fills for dead and stuck pixels, motion patterns for ghosting and response time, gradients for banding, and measured tests for refresh rate and frame pacing. Best viewed fullscreen with the lights low.
All 38 tools here are free and open immediately — there is no registration step, no credit card and no daily allowance to run out of. Most of them do their work in your browser, which means the page keeps working on a slow connection and your input is never sent to a server.