Why test with a red screen?
Red isolates one RGB channel, making certain stuck or dead pixels easier to see than on mixed content.
Red screen
A uniform red screen isolates the red color channel so you can spot dead pixels, stuck subpixels, and panel uniformity issues.
Click to enter fullscreen
Cycles white, black, red, green, and blue every 5 seconds. Best in fullscreen. All display tests →
Resolution preset
How to Use
- Open the red screen page.
- Enter fullscreen mode from the preview or button.
- Look for dark or contrasting dots across the panel.
Why Use a Red Screen?
Red channel test
Verify the red channel renders evenly from edge to edge on LCD and OLED panels.
Stuck pixel check
Pixels stuck on green or blue may appear as contrasting dots against pure red.
Mood lighting
Red provides dramatic ambient light for photography, streaming, or creative setups.
Red screen for color-channel diagnostics
Cycling red, green, and blue fullscreen colors is a standard quick test for subpixel defects without specialized software.
Perceived red brightness depends on gamma and color temperature — compare results with white and black for context.
Explore Other Screen Tools
White screen for display testing
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Black screen for display testing
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Green screen for display testing
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Blue screen for display testing
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Yellow screen for display testing
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Orange screen for display testing
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Pink screen for display testing
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Purple screen for display testing
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Grey screen for display testing
Open fullscreen grey background
FAQs
Should I test all colors?
Yes. Cycle red, green, blue, white, and black for a thorough channel and contrast check.
Can I download a red background?
Use the download controls to export PNG at your chosen resolution.
Is red safe for long sessions?
Lower brightness for extended use and take regular breaks like any bright display.