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File processing runs in your browser. Documents are not uploaded to our servers. The site may download processing engines and send usage or feedback events without file contents.
How we handle your dataScreen
Black Screen — full-screen black
Fill the screen with pure black for OLED checks, backlight bleed, dark rooms or as a blank screen.
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More in Screen
Dead Pixel TestFill the screen with solid colours to spot dead or stuck pixels.Screen Refresh Rate TestEstimate your screen refresh rate from the browser's frame timing. Browsers can limit the measured rate.White Screen — full-screen colourFill the screen with white or any colour, adjust brightness, and use it as a light or to clean and check the screen.Monitor Test — colours, gradients and uniformityCheck colours, gradients, black and white levels, uniformity, sharpness and viewing angles of your monitor.FPS Test — browser frame rateSee the frame rate your browser renders and how smooth motion looks at different speeds. Browser frame rate, not game FPS.What Is My Screen ResolutionSee your screen resolution, browser window size, pixel ratio, colour depth and orientation.What Is My Browser — browser and device detailsSee your browser, version, operating system, user agent, language, time zone and which features are enabled.Stuck Pixel FixerFlash rapidly changing colours over a stuck pixel to try to revive it. Dead (always black) pixels usually cannot be fixed.