MonitorTest Pro gives you 20+ professional display diagnostic tools — all free, all browser-based, no download required. Whether you just bought a new monitor, suspect a defect, or want to calibrate your screen for color-critical work, every tool you need is here.
Start with the dead pixel test if your screen has a suspicious dark or bright spot. Run the brightness and contrast tests to calibrate before photo editing or gaming. Use the motion blur and response time tests to evaluate your monitor's performance for fast-paced gaming. The backlight bleed and uniformity tests reveal issues that only show up in dark conditions — invisible in daylight but distracting during movies or late-night sessions.
Every test runs entirely in your browser. No apps to install, no accounts to create. The tools work on any screen — desktop monitors, laptop displays, TVs, and tablets — as long as you have a modern browser. If you find a problem, our guides explain what each defect means, whether it's covered by your warranty, and what steps to take next.
Monitors rarely come with obvious defects, but subtle issues — a dead pixel near the center, uneven backlight bleeding into the corners, inaccurate color reproduction — affect your work and viewing experience in ways that are hard to pinpoint without a diagnostic tool. A five-minute systematic test on a new purchase gives you a documented baseline and protects your warranty rights. If a problem develops later, early documentation makes the warranty claim straightforward.