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Screen & Display Tests
Dead pixel, refresh rate, color, monitor calibration and screen test tools. 28 free tools that run in your browser, no sign-up needed.
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Refresh Rate TestCheck your monitor's refresh rate in Hz and spot dropped frames.Dead Pixel TestFind dead or stuck pixels on your screen.What Is My Screen ResolutionSee your screen resolution, viewport, pixel ratio, colour depth and display features.Screen FlashlightTurn your screen into a bright white or coloured light that stays awake.Ring LightTurn your screen into a ring light or fill light with adjustable color temperature.Online RulerAn actual-size on-screen ruler in cm, mm and inches, calibrated with a credit card.Device Pixel Ratio CheckerSee your device pixel ratio, CSS viewport, physical resolution and screen PPI live.Color Blindness TestQuick 14-plate dot test that screens for red-green and blue-yellow color vision deficiency.Monitor TestFull-screen monitor test patterns: uniformity, banding, gamma, sharpness, black level, ghosting.Backlight Bleed TestFull-screen black and dark gray screens to check backlight bleed, IPS glow, clouding and blooming.Color Hue TestDrag color caps into hue order, FM100-style, and get an error score and a hue error chart.Color Perception TestFind the one tile with a different shade. The grid grows and colors get closer each level.Monitor Ghosting TestMoving-object pursuit test to reveal ghosting, overshoot and motion blur, with refresh rate.Screen Burn-in FixerFull-screen color cycles, noise and scrolling bars to reduce image retention, with a timer.Black ScreenFull-screen pure black page for OLED, screen cleaning or focus, with timer and hidden cursor.Color Printer Test PagePrint a CMYK + RGB color test page: color bars, gradients, skin tones and cartridge blocks.Online Eye Test ChartScreen-calibrated Snellen and tumbling E eye chart for a quick at-home vision check.Green ScreenFull-screen chroma key green (#00B140 or #00FF00) or any custom shade, with hidden cursor.HDR TestCheck if your screen shows HDR, compare HDR and SDR white, estimate peak brightness and color gamut.Monitor Calibration ToolGuided monitor calibration: brightness, contrast, gamma, sharpness and color test patterns.Printer Test PagePrint a black & white test page: text sizes, line grids, gray ramp, nozzle pattern, Letter or A4.Screen Tearing TestFast moving bars and panning patterns that make screen tearing and V-Sync problems easy to see.Astigmatism TestCheck each eye with a calibrated clock-dial chart and note which lines look darker.Heart Rate Monitor (Camera)Measure your pulse with your phone camera and flash: live BPM, waveform and history.Keep Screen AwakeStop your phone or computer screen from sleeping with one tap, with an optional timer.Frame Skipping TestLight one box per frame and photograph it to catch skipped frames after overclocking a monitor.Projector Test PatternFull-screen projector focus grid, keystone lines, color bars and 16:9, 4:3 and 2.35:1 frames.Touch Screen Accuracy TestTap shrinking targets to measure touch offset error per screen region, with a heatmap.
About Screen & Display Tests
Test a monitor or phone screen for dead or stuck pixels, refresh rate, color and resolution. Run the tests in full screen and check each solid color carefully, especially on a newly bought display.
Most used here: Refresh Rate Test, Dead Pixel Test and What Is My Screen Resolution.