Comprehensive display testing tool that fills your screen with solid colors (red, green, blue, white, black) to detect dead pixels, stuck pixels, or color uniformity issues. Essential for checking new displays or troubleshooting screen problems.
Dead pixels are permanently off (black), while stuck pixels are permanently on (red, green, or blue). This tester uses full-screen color fills to make even single dead or stuck pixels visible. Professional display manufacturers use similar tests during quality control.
Start with the live tester below. Supporting details, FAQs, and troubleshooting guidance are placed after the tool so the main action is easier to find and use immediately.
Fill your screen with solid colors to spot dead or stuck pixels.
Common problems
If the live tester does not behave as expected, these are the first checks most users should try before assuming the hardware is broken.
Test all primary colors - red, green, blue, white, black
Look for dead pixels - permanently black spots
Check for stuck pixels - permanently colored spots
Test color uniformity - ensure even color across screen
Comprehensive display testing tool that fills your screen with solid colors (red, green, blue, white, black) to detect dead pixels, stuck pixels, or color uniformity issues. Essential for checking new displays or troubleshooting screen problems.
Dead pixels are permanently off (black), while stuck pixels are permanently on (red, green, or blue). This tester uses full-screen color fills to make even single dead or stuck pixels visible. Professional display manufacturers use similar tests during quality control.
Test your keyboard input, detect dead keys, and verify all keys are working correctly.
Test mouse buttons, scroll wheel, pointer tracking, and touch input.
Test your microphone input levels in real-time. Verify microphone is working.
Test your speakers or headphones with reference tones.
Helpful questions
Use these answers to understand results, browser limitations, permissions, and sensible next troubleshooting steps.
A dead pixel usually stays black because it no longer lights up, while a stuck pixel remains locked on one color such as red, green, or blue. Full-screen color tests make both easier to spot because the faulty pixel stands out clearly against the surrounding area.
Yes. Some display issues are easier to notice at specific brightness levels. Backlight bleed, dim patches, color shift, and uneven uniformity can appear much more obvious when brightness changes, so testing more than one level gives a better picture of the panel's condition.
Yes. It is useful during the first setup window when you want to check for dead pixels, severe backlight bleed, color uniformity problems, or obvious panel defects before your return period expires.