Full Screen Color Picker & Screen Tester
Fill your screen with any color you pick, or cycle through presets to test for dead pixels and check monitor uniformity. No install, no sign-up.
What people use a color screen test for
Test for dead or stuck pixels
Cycle through red, green, blue, black, and white. A pixel that stays the wrong color on every solid field is dead or stuck.
Check monitor color uniformity
Fill the screen with a single flat color and look for patches, tinting, or vignetting across the panel.
Use a solid color as a background
Pick an exact color for a green-screen-style backdrop, a plain colored background for photos, or a visual reference.
Verify color test screen results
Run through the full preset sequence to confirm every part of the panel renders each color consistently.
Calibrate a projector or external display
Feed a known solid color to a projector or second monitor to compare against its intended output.
Create a colored full-screen background
Some people use a specific brand color or plain background full screen for streaming overlays or presentations.
How to run a full dead pixel test
- Step 1
Set your screen to a moderate brightness, not maximum. Very high brightness can wash out faint stuck pixels.
- Step 2
Go full screen and start with white. Scan every corner slowly for any dark dot.
- Step 3
Switch to black. Look for any bright or colored dot, especially near the edges.
- Step 4
Cycle through red, green, and blue in turn. A stuck pixel invisible on white or black often stands out here.
- Step 5
Note the position and behavior of anything you find across all five colors before deciding what it is.
- Step 6
Repeat once from a different viewing distance. Small stuck pixels are sometimes only visible up close.
Dead, stuck, and hot pixels compared
| Type | Appearance | Best test color |
|---|---|---|
| Dead pixel | Stays black on every background | White |
| Stuck pixel | Fixed on one color, often red, green, or blue | Black |
| Hot pixel | Bright dot, most visible on dark backgrounds | Black |
There is no single industry-wide standard for how many dead or stuck pixels make a screen defective. Manufacturers set their own thresholds, often requiring three or more before authorizing a replacement. Full detail, including buying-a-new-monitor guidance, is in the dead pixel test guide.
Different names, same tool
A few visitors search specifically for a green-screen-style backdrop, such as a white flag with a green screen image, or a plain green background for a chroma key setup. The custom color picker on this page produces any exact color needed for that kind of backdrop, including pure green (#00FF00) as a standard chroma key reference.
Why colors reveal panel problems that white and black miss
Subpixels and why five colors matter
Every pixel is built from three subpixels: red, green, and blue. A subpixel failure only shows up clearly when the color it controls should be part of the displayed color and is not, or the reverse. That is why a defect invisible on white can stand out sharply on solid red, green, or blue.
Full screen color for streaming and presentations
Some visitors use a specific brand color or a plain colored background full screen as a transition slide, a placeholder during a stream, or a background reference for a video call. The custom color picker matches any exact hex value for this purpose.
Standards behind pixel defect testing
Display manufacturers historically referenced the ISO 13406-2 standard for classifying pixel defects by class and tolerance, though many manufacturers now publish their own specific policies instead. For general background on how pixel defects are categorized, see the overview of ISO 13406-2 on Wikipedia. Always confirm the current policy with your specific manufacturer, since practices vary and standards have evolved.
Common questions
How do I test my screen for dead pixels?
Go full screen, then cycle through each preset color: white, black, red, green, and blue. A dead pixel stays black on every color. A stuck pixel stays one fixed color (often red, green, or blue) no matter what color fills the rest of the screen.
What is the difference between a dead pixel and a stuck pixel?
A dead pixel receives no power and stays black on every background. A stuck pixel is receiving power but locked to one color. Stuck pixels sometimes resolve on their own or with gentle massage techniques; dead pixels do not.
Can I pick any color, not just the presets?
Yes. Use the custom color picker to choose any exact color and fill your full screen with it.
Why does my screen look slightly different colors in different corners?
This is usually backlight bleed or panel uniformity variance, most visible on a solid color at full brightness. It is a hardware characteristic of the display, not something this tool causes.
Is this the same as a color test screen or screen tester?
Yes. Color test screen, screen tester, and monitor color test all describe the same task: filling your display with solid, known colors to inspect it. This tool covers all of them.
How many dead pixels are considered normal?
A single stuck or dead pixel is common and falls within normal manufacturing tolerance for most consumer panels. Three or more, especially clustered together, is what most manufacturers treat as a genuine defect worth a replacement. Check your specific manufacturer's policy for the exact threshold.
Can I test a projector with this tool?
Yes. Project this page in full screen mode and cycle through the preset colors to check for uniformity, dead spots, or color casts, the same way you would test a monitor.
What is the exact color code for the green preset?
The preset green swatch uses #00FF00, a standard pure green often used as a chroma key reference for green-screen video work.