Free Online Screen Test Tool - Instantly diagnose dead pixels, lines, color issues, and flickering. Multiple test modes, no download needed, runs fully in the browser, no sign-up.

Screen Issues is a free website that helps anyone check the health of a display in a few seconds. Whether you just bought a new monitor, laptop, phone, tablet or TV, or you suspect that an older screen is starting to fail, Screen Issues gives you a simple way to find out what is going on. Open the site, start a test, switch to fullscreen, and the tool cycles through solid colors and patterns that make common defects easy to spot.

With the different test modes you can look for dead pixels, stuck pixels, bright spots, backlight bleed, lines across the panel, uneven colors, and flickering. Because everything runs locally in your browser, there is nothing to install, no account to create, and no data to upload. It works on desktop and mobile devices alike.

Beyond the test itself, Screen Issues publishes clear, practical diagnosis guides. They explain what each type of problem looks like, what usually causes it, whether it can be fixed at home, and when it is time to contact the seller or manufacturer about a warranty claim or return. The goal is to help regular users, buyers of second-hand devices, IT staff and repair technicians make confident decisions about their screens, quickly and completely free of charge.