Dead Pixel Test — Fullscreen Red, Green, Blue & White

How to use

1. Close distracting windows, set brightness to normal, press Start fullscreen test.
2. Step through red, green, blue, white and black with click, Space or the → key.
3. Scan slowly: dead = black everywhere, stuck = one frozen color, sub-pixel = faint flicker.
4. Press Esc or the exit button to return; photograph any defect for your warranty claim.

About this tool

New monitor, new laptop — the first weeks are when dead pixels make themselves known, and spotting a single dark dot on a busy desktop is nearly impossible. This test makes it easy: it takes your entire screen fullscreen and floods it with pure red, green, blue, white and black, one color at a time. Click, tap, press Space or the arrow keys to advance; Esc or the on-screen exit button brings you back here. On solid colors, defects pop out: a pixel that stays black on every color is dead, one frozen on red, green or blue is stuck, and faint colored flicker is a sub-pixel defect. Honest limits: this tool helps you FIND defective pixels for warranty claims — it cannot FIX them; anyone promising pixel repair is selling hope.

FAQ

Rate this tool

Your rating stays in this browser (local storage) — nothing is sent to any server.