A dead pixel test displays fullscreen solid colors so you can spot dead or stuck pixels on your monitor, phone or laptop screen instantly.
A dead pixel test displays fullscreen solid colors so you can spot dead or stuck pixels on your monitor, phone or laptop screen instantly. Our dead pixel test is built on the same core dead pixel checker stuck pixel test screen dead pixel and is trusted by students, professionals and everyday users who need a fast, accurate result. Because every calculation runs locally in your browser, there is no waiting, no sign-up and no limit on how often you use it.
What is an Online Dead Pixel Test?
A dead pixel test is an essential diagnostic screen test that displays full-screen, solid primary and neutral colors across your entire display panel. By inspecting your monitor or TV against solid white, black, red, green, blue, and gray backgrounds, you can instantly identify defective display pixels, malfunctioning subpixels, optical color banding, and backlight uniformity anomalies. Our online dead pixel test runs directly in your web browser with zero software downloads, working across all LCD, LED, OLED, AMOLED, IPS, and VA displays on Windows, macOS, Android, and iOS devices.
Dead Pixels vs. Stuck Pixels vs. Hot Pixels (How to Identify Them)
Understanding the specific type of pixel defect is critical for determining whether your screen can be fixed or requires a warranty replacement: ā¢ Dead Pixels: A dead pixel occurs when the thin-film transistor (TFT) powering a pixel fails to receive power, leaving the pixel permanently switched off. On bright or solid white screens, a dead pixel appears as a tiny, persistent black dot. ā¢ Stuck Pixels: A stuck pixel happens when one or two individual RGB (Red, Green, Blue) subpixels remain continuously energized while the others switch off. A stuck pixel appears as a permanent bright red, green, blue, cyan, magenta, or yellow dot against contrasting backgrounds. ā¢ Hot Pixels: A hot pixel is a pixel where all three color subpixels are permanently stuck on at full luminance, resulting in a persistent bright white dot, even on pure black screens.
How to Check Your Monitor for Dead Pixels (Step-by-Step Guide)
Follow these recommended testing steps to thoroughly inspect any computer monitor, gaming display, laptop panel, or television: 1. Clean Your Screen: Gently wipe dust particles and smudges off your monitor surface with a clean microfiber cloth before beginning, so specks of dust are not mistaken for dead pixels. 2. Enter Fullscreen Mode: Click on any test color above or press "Launch Fullscreen Test" to expand the solid color across 100% of your screen area. 3. Solid White Test: Inspect the entire display area for black dots (dead pixels) or dark edge shadow vignetting. 4. Solid Black Test: Inspect for bright white dots (hot pixels), stuck colored subpixels, and uneven backlight bleed in dark viewing conditions. 5. Solid Red, Green & Blue Tests: Cycle through pure primary RGB colors to identify isolated stuck subpixels that only fail on specific color channels. 6. 50% Neutral Gray Test: Verify overall panel brightness uniformity, IPS glow, and dirty screen effect (DSE).
How to Fix Stuck Pixels (Stuck Pixel Fixer & Strobe Methods)
While physically dead pixels (unpowered transistors) cannot be repaired through software, stuck subpixels can often be unstuck and restored. The most proven non-invasive method is rapid RGB color cycling (strobe flashing). Our built-in Stuck Pixel Fixer tool flashes high-frequency red, green, blue, and white colors over the affected area to rapidly exercise and loosen the stubborn liquid crystal molecules. Letting the color strobe run over a stuck pixel for 15 to 30 minutes frequently restores the subpixel back to normal operation.
Manufacturer Dead Pixel Policies & ISO 9241-307 Standards
Display manufacturers adhere to the international ISO 9241-307 standard (formerly ISO 13406-2), which classifies displays into four defect tolerance categories. Most consumer monitors and laptops fall under Class 2, which permits up to 2 permanently hot pixels, 2 dead black pixels, and up to 5 stuck subpixels per million pixels before qualifying for an RMA warranty return. Premium gaming monitors often feature "Zero Bright Dot" (ZBD) warranties that guarantee immediate replacement if even a single stuck bright subpixel is detected within the warranty window.
Advanced Display Diagnostics: Backlight Bleed, Contrast & Motion Ghosting
In addition to solid color pixel checks, complete screen diagnostics evaluate three key performance factors: 1) Backlight Bleed & IPS Glow: Uneven light leaking around the bezel edges noticeable in dark scenes; 2) Contrast Ratio & Gamma Steps: Smooth gradation between deep shadows and bright highlights without crushing near-black details; and 3) Response Time Motion Ghosting: Trailing artifacts and pixel overshoot behind fast-moving objects, easily tested using our motion response canvas.
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