MonitorTester

What is MonitorTester?

MonitorTester is a free online screen test that runs entirely in your browser. Display diagnostic patterns — solid RGB/CMYK colors, grayscale ramps, gradients, color bars and motion tests — to spot dead pixels, backlight bleed, color tint, banding, ghosting and burn-in. No install or account needed; works on any monitor, laptop, TV, tablet or phone. Perfect for buying/returning displays, checking used monitors, or calibrating multi-screen setups.