Dead Pixel Test Check Free & Fix Monitor, Laptop & Phone — Online Test

A dead pixel is a display pixel that no longer functions and remains permanently black regardless of what is displayed on screen. The transistor controlling that pixel has failed and receives no electrical signal. Dead pixels appear as tiny black dots most visible against bright or white backgrounds. A stuck pixel is similar but remains permanently lit in one color (red, green, blue, or white) — it's technically always "on" rather than off. A hot pixel is stuck white (all three RGB sub-pixels on). Use this free online dead pixel test to check your screen with pure black, white, and solid color backgrounds — no registration required.

Open this free online dead pixel test in your phone's browser (Chrome on Android, Safari on iOS). Tap the Full Screen Test button to enter full-screen mode — this covers your entire phone display including the notch and edge areas. Cycle through each test color and scan every millimeter of the display with your eyes. The pixel zoom lens works via touch — tap and hold to see the magnified pixel view. For OLED phone screens (iPhone OLED, Samsung AMOLED), test especially carefully on black and dark gray backgrounds as bright-pixel defects are most visible on OLED. No app download, no registration required.

Stuck pixels can sometimes be fixed using two methods: 1) Software cycling: rapidly cycling the stuck pixel through all colors at high speed (like our Auto Cycle feature) can sometimes unstick a transistor. Run the auto cycle at 1.5-second intervals for 10–20 minutes. 2) Pressure massage: turn off the screen, apply very gentle pressure with a soft cloth directly over the stuck pixel for 10–30 seconds, then turn the screen back on. This works occasionally. True dead pixels (permanently black) cannot be fixed by software — the transistor is broken. These require panel replacement or manufacturer warranty service. Use this free test first to confirm which type you have before attempting fixes.

The international standard is ISO 9241-307 (formerly ISO 13406-2) which defines five classes of pixel defect tolerance. Class I: Zero defective pixels allowed — premium guarantee. Class II: Up to 2 fully dark pixels, 2 fully bright pixels, 5 partially lit pixels per million pixels. Class III/IV: Higher tolerances for budget displays. Most consumer monitors sold today use Class II. Dell UltraSharp, ASUS ProArt, and some BenQ models offer Class I (zero dead pixel) guarantees. Always use this free dead pixel test immediately on receiving a new screen — most warranty policies require defects to be reported within 30 days. Export a report from our free tool as documentation.

The most important colors for this free dead pixel test are: Black (#000000) — reveals stuck/hot pixels showing any color against black. White (#ffffff) — reveals dead pixels as black dots. Pure Red (#ff0000) — tests the red sub-pixel channel only; a dead-looking pixel on red may be fine on other colors (sub-pixel failure). Pure Green (#00ff00) — tests green sub-pixel channel. Pure Blue (#0000ff) — tests blue sub-pixel channel. For thorough testing, also test Cyan, Magenta, and Yellow — these combinations reveal two-sub-pixel failures. Each of our 9 test colors is scientifically selected to reveal the maximum number of defect types. No registration needed for any color.

Yes — this free online dead pixel test works on all display technologies including OLED, AMOLED, Super AMOLED, LCD IPS, LCD TN, LCD VA, Mini LED, and Micro LED screens. For OLED and AMOLED screens specifically, the most important tests are: Black (OLED blacks are absolute — any lit pixel on black is immediately obvious) and solid colors (individual OLED pixel failures are easier to spot than on LCD). OLED screens can also develop burn-in (not pixel death but image retention) which appears as ghost images — test with solid colors to check for this. OLED dead pixels are more expensive to repair than LCD as the entire panel usually needs replacement.

Dead pixels are individual pixels that have physically failed — they show a fixed black, white, or colored dot that is unrelated to screen content. Screen burn-in (also called image retention or ghost image) is when a previously displayed static image leaves a permanent or semi-permanent ghost on screen. Burn-in affects OLED and plasma displays; LCD screens can have image retention (temporary) but rarely permanent burn-in. To distinguish: dead pixels appear as fixed dots in one location; burn-in appears as a faint ghost image visible especially on contrasting backgrounds. Test for burn-in using our solid color fill — ghost images from burn-in will be faintly visible. Use this free dead pixel test to check both conditions, no registration required.

Absolutely — always run this free dead pixel test immediately on receiving any new display before you start using it. This is critical for two reasons: 1) Warranty timing: Most manufacturers require dead pixel claims to be filed within 14–30 days of purchase. Once that window closes, you may lose your right to a free replacement. 2) Return windows: Retailer return periods (Amazon, Best Buy, B&H, etc.) are typically 14–30 days. Test immediately so you have time to return if defects are found. Always test in a darkened room with full-screen black and white first. Export a report with coordinates from our free tool before contacting the manufacturer — documentation makes the warranty claim process faster.

Not necessarily. Several things can look like dead pixels but aren't: 1) Dust or debris — clean your screen first with a microfiber cloth. A dot that disappears after cleaning is not a pixel defect. 2) Screen scratches — scratches catch light differently on different backgrounds. 3) Backlight bleed — bright areas near screen edges on dark test screens are backlight leakage, not dead pixels. 4) IPS glow — corner brightness on dark backgrounds is normal for IPS panels. 5) Mura effect — slight color uniformity variations are normal and not classified as pixel defects. A true pixel defect is a single-pixel-sized, sharp-edged dot or bright spot that remains in exactly the same location across all test colors. Use the zoom lens on our free tool to examine suspected areas at 8× magnification — no registration required.

This free dead pixel test requires a browser with JavaScript — it works in any modern browser on any device with internet access. For smart TVs with built-in browsers (Samsung Tizen, LG webOS, Android TV): open the browser, navigate to this free dead pixel test page, and use full-screen mode. The color fill tests work identically on any screen size. For gaming monitors: connect via HDMI from your computer, display the full-screen test, and use the monitor controls to check all screens. For offline use: save this webpage (File > Save Page As in Chrome/Firefox) to your computer — once saved, all functions work offline since no external resources are needed. No registration required for any platform.