Display & screen tests
Hunt for dead or stuck pixels and check color and uniformity with full-screen patterns — perfect when buying or inspecting a monitor or phone.
Dead pixel test Fill your screen with solid red, green, blue, white and black to hunt for dead or stuck pixels on any monitor, laptop or phone. No download or permission needed, and nothing ever leaves your browser. Backlight Bleed & IPS Glow Test This free tool fills your monitor or laptop screen with solid black and dark shades in full-screen, making backlight bleed, clouding, and IPS glow easy to spot around the edges. It runs entirely in your browser; nothing is uploaded. Monitor refresh rate test Find out how many frames per second your display refreshes — 60 Hz, 120 Hz, 144 Hz or more. We measure it with requestAnimationFrame and show a moving animation so you can judge smoothness, all in your browser. Monitor color test Check your screen's color and uniformity in seconds. Cycle through solid red, green and blue swatches, smooth gradients that reveal banding, and grayscale steps for contrast — all rendered locally in your browser with nothing uploaded.