Dead Pixel Test (Online, Full Screen) & Screen Color Tests
Thirty-three full-screen colour and gradient test videos for finding dead or stuck pixels and checking how a display renders colour, from solid primaries to gray ramps and gamma patterns. Each one is a single, uniform pattern held on screen long enough to inspect every corner of the panel - no cuts, no compression artefacts hiding in busy footage.
What these files actually are
Every pattern here is generated programmatically at the exact RGB or gray value stated in its spec, not photographed off a reference display, so what you download is the value it claims to be - verify it yourself with a colour picker on a paused frame. Files are free to download, carry no watermark, and need no attribution; each one is hosted on Cloudflare R2 and listed with its SHA-256 hash and a VirusTotal link so you can confirm the file hasn't been tampered with before running it on a client's or customer's display.
Online dead pixel test (full screen)
Run the test right in your browser, no download needed. Press Start, then click or use the arrow keys to switch patterns. To test a TV or projector without a browser, use the video files further down.
Click / → / Space: next · ←: previous · A: auto-play · Esc: exit
How to run the test
- Clean the screen and set the display to its native resolution with 100% scaling.
- Press Start (or pick a pattern below). The test fills the whole screen; the controls hide after a moment.
- Look over the whole screen on every pattern, from normal viewing distance and then up close.
- Press Esc to leave. Note where any defect is and photograph it on the pattern that shows it best, e.g. for a warranty claim.
Test patterns and what to look for
- Black
- Dead or stuck pixels show up as bright or coloured dots. In a dark room, light leaking from the edges or corners is backlight bleed (LCD) or IPS glow.
- White
- Dead pixels show up as black dots. Also look for dust behind the panel, a yellow or pink tint, and corners that are darker than the centre.
- Red
- Every pixel should be the same red. A black or differently coloured dot means a dead or stuck subpixel.
- Green
- Green is the brightest primary, so stuck and dead green subpixels are easiest to spot here.
- Blue
- Dead blue subpixels are hard to see on white; this pattern isolates them.
- Cyan
- Lights green and blue together: a single failed subpixel shows up as a green or blue dot.
- Magenta
- Lights red and blue together: a dot of pure red or blue points to a failed subpixel.
- Yellow
- Lights red and green together: a red or green dot points to a failed subpixel.
- Gray 50%
- The classic uniformity field: look for darker corners, vertical or horizontal bands, a colour shift between areas, and image retention.
- Stuck pixel fixer
- A rapidly flashing patch of red, green and blue noise. Move the mouse to place it over a stuck pixel and leave it running for 10–20 minutes. It can revive a stuck (coloured) pixel, but never a dead (black) one.
⚠ This pattern flashes rapidly. Do not use it if you are sensitive to flashing light (photosensitive epilepsy). Continue?
Common use cases
Buying a used monitor or TV
Scan the whole panel for dead or stuck sub-pixels before completing a purchase.
Warranty and return claims
Document pixel defects with a repeatable, full-screen reference before filing a claim.
4K Dead Pixel Test – Red Green Blue White Black Full Screen
Dead Pixel Test — watch full screen at highest quality. Look for dots that stay the wrong color.
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Download1080pMP4 · 826 KB
Dead Pixel Test for Monitor, TV and Laptop – 10 Minutes
Dead Pixel Test — full screen, wipe your screen first. Two full color cycles, no text during the test.
OLED Dead Pixel and Stuck Pixel Test – Full Screen Colors
OLED Dead & Stuck Pixel Test — view in a dark room. Starts with pure black (pixels fully off), then near-black, then full colors.
Black Screen Test – 10 Minutes Full Screen
Black Screen Test — 10 minutes of pure black. Checks backlight bleed, stuck pixels, and OLED black depth.
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Download1080pMP4 · 2.1 MB
White Screen Test – 10 Minutes Full Screen
White Screen Test — 10 minutes of pure white. Reveals dead pixels, dust inside the panel, and tint problems.
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Download1080pMP4 · 2.1 MB
Red Screen Test – Dead Pixel Check
Red Screen Test — full screen pure red. A dot that isn't red is a dead or stuck subpixel.
Green Screen Test – Dead Pixel Check
Green Screen Test — full screen pure green. A dot that isn't green is a dead or stuck subpixel.
Blue Screen Test – Dead Pixel Check
Blue Screen Test — full screen pure blue. A dot that isn't blue is a dead or stuck subpixel.
Gray Screen Test – Monitor Uniformity Check
Gray Screen Test — 50% gray full screen. Look for tint, dark patches, and vertical bands.
Yellow Screen Test – Dead Pixel & Subpixel Check
Yellow Screen Test — full screen pure yellow. Yellow drives the red and green subpixels together: a dark dot is a dead subpixel, a blue-tinted dot is a stuck blue subpixel.
Cyan Screen Test – Dead Pixel & Subpixel Check
Cyan Screen Test — full screen pure cyan. Cyan drives the green and blue subpixels together: a dark dot is a dead subpixel, a red-tinted dot is a stuck red subpixel.
Magenta Screen Test – Dead Pixel & Subpixel Check
Magenta Screen Test — full screen pure magenta. Magenta drives the red and blue subpixels together: a dark dot is a dead subpixel, a green-tinted dot is a stuck green subpixel.
Orange Screen Test – Full Screen Orange Color
Orange Screen Test — full screen orange. Spot stuck pixels and color-uniformity problems, or use it as a warm ambient light.
Pink Screen Test – Full Screen Pink Color
Pink Screen Test — full screen soft pink. Check for stuck pixels and uneven color reproduction, or use it as a gentle mood light.
Purple Screen Test – Full Screen Purple Color
Purple Screen Test — full screen purple. Purple mixes red and blue: blotches or tint shifts point to color-uniformity problems.
Grayscale Gradient Test – Black to White
A smooth black-to-white ramp. Visible vertical bands are banding — download the original file before judging; YouTube compression adds banding.
Brightness Gradient Test
A smooth vertical brightness ramp for quick banding and gamma checks.
RGB Gradient Test – Monitor Color Banding
Red, green and blue ramps. Steps inside any ramp are banding — confirm with the downloaded original, not the YouTube stream.
Color Gradient Test – Check Screen Banding
Gray plus RGB ramps on one screen. YouTube compression adds banding — download the original for a fair test.
Gray Ramp Test – Monitor Calibration
A reference gray ramp: it should look smooth and neutral across the full width.
RGB Color Test – Red Green Blue Full Screen
Full-screen pure red, green and blue. Each should be vivid and even, with no off-color patches.
CMYK Color Test – Cyan Magenta Yellow Black
Full-screen cyan, magenta, yellow and black.
4K Monitor Color Test – Full Color Sequence
The full color sequence at genuine 4K resolution.
Neutral Gray Screen Test
A reference 50% gray field: it should look perfectly neutral — any warm or cool cast is a white balance error.
Monitor Gamma Test – 1.8, 2.2 and 2.4
Only valid at native resolution, 1:1 pixel mapping, no scaling. YouTube re-encodes video - download the lossless PNG for the definitive test. Step back or squint: the solid patch that blends into its stripe block is your display gamma. Reference only - not a substitute for a colorimeter.
Gamma 2.2 Test Pattern
Only valid at native resolution, 1:1 pixel mapping, no scaling. YouTube re-encodes video - download the lossless PNG for the definitive test. At gamma 2.2 the stripe block and the solid patch should merge when viewed from a distance.
Grayscale Tracking Test
Every gray step should be neutral - any step drifting warm or cool is a grayscale tracking error.
White Balance Test – Warm vs Neutral vs Cool
Compare your display's white against warm/neutral/cool references.
Color Temperature Test – 6500K Reference
The center panel approximates the D65 (6500K) broadcast reference white.
Color Saturation Test – Monitor and TV
Saturation ladders per color - each step should be distinct without clipping at 100%.
Color Tint Test – Check Red Green Blue Balance
The three tinted panels differ from neutral by only ±2%. If you cannot spot the odd one, your eyes (or display) are off balance.
Skin Tone Color Test Image Video
A synthetic skin-tone ladder - hue shifts here are the most noticeable calibration error in real content.
Color Bars Test Pattern – TV and Monitor
Standard SMPTE HD color bars for broadcast-style checks.
Frequently asked questions
- What is the difference between a dead and a stuck pixel?
- A dead pixel stays black in every color field; a stuck pixel shows a fixed color regardless of what the screen should display.
- How should I watch this?
- Play it full-screen in a dim room and look closely at each color field for any pixel that does not match the rest of the screen.
- Which test should I start with?
- Start with the black and white full-screen tests - they show dead pixels (always black) and stuck pixels (a fixed colour) most clearly. Cycle through the primary colours afterwards to double-check any pixel you are unsure about.
More test categories
- UFO Test & Refresh Rate Test — Online + 57 Free Videos
- OLED & Backlight Bleed Test — Online Full Screen + 27 Videos
- Brightness & Contrast Test Patterns — 10 Free Calibration Videos
- Flicker, BFI & Motion Clarity Tests — 23 Free Videos
- HDMI Signal & Chroma Processing Tests — 26 Free Videos
- Monitor Test Online — Full-Screen Patterns + 38 Free Videos
- Gaming Monitor Tests — 16 Free VRR, Ghosting & Blooming Videos
- Projector Test Patterns — 17 Free Downloads (Focus, Grid)