Tool

Dead pixel test

Fill your display with solid colours one at a time. A dead pixel stays black, a stuck pixel shows the wrong colour, and a hot pixel stays bright — any of these will stand out against a flat field.

· Tap, click or press → to change colour.
· Press Esc or tap the ✕ to exit.
· Inspect each flat colour closely for any spot that doesn't match.

Tip: clean your screen first so dust isn't mistaken for a dead pixel.