Free Online Screen Test Tool - Instantly diagnose dead pixels, lines, color issues, and flickering. Multiple test modes, no download needed.

Screen Issues is a free online resource for identifying, understanding, and troubleshooting display defects on monitors, laptops, phones, and tablets. The interactive Screen Test tool runs full-screen solid colors in the browser — no download — so you can spot dead pixels, stuck pixels, bright spots, black spots, backlight bleed, and color uniformity issues in seconds.