Click the test button to enter full screen and run through dead pixel, solid color, line, grid, contrast, grayscale, saturation and motion response checks.
Clean the screen first, then enter full screen mode. Use white, black, red, green and blue screens to inspect dead pixels, bright pixels, dark pixels and backlight bleed. Then switch to grayscale, color ramps, contrast and grid patterns to check transitions, clarity and scaling.
Use Left and Right to switch tests, Space to cycle solid colors, F to enter or exit full screen, and Esc to exit the test.
This online screen test tool is useful for basic display checks on monitors, laptop screens, phones, TVs and projectors. Solid color mode helps find dead pixels and backlight bleed, grayscale and color ramps reveal transitions, and contrast and grid modes help inspect edge sharpness, scaling clarity and panel uniformity. All test patterns are generated locally in the browser.
