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Free Online Screen Test Tool - Instantly diagnose dead pixels, lines, color issues, and flickering. Multiple test modes, no download needed.
About
Screen Issues
Screen Issues runs entirely in your browser: open a full-screen solid color test to spot dead or stuck pixels, check for backlight bleed and bright spots, look for vertical or horizontal lines, and evaluate color uniformity and flicker. Step-by-step diagnosis guides explain what each defect means, whether it can be fixed, and when to request a warranty replacement. Works on monitors, laptops, TVs, tablets and phones, with no signup or installation required. Made by Feng Zeng.
Updated October 6, 2026Community
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