Free online tool to check your monitor, laptop, or TV for dead pixels, stuck pixels, and backlight bleeding. Click any color to start a fullscreen test.
🔍 Dead Pixel Test
A dead pixel is a pixel on your screen that doesn't display the correct color — it may appear as a permanently black, white, or colored dot.
Click any color below to fill your entire screen and scan for anomalies. Press Esc or click to exit.
📋 How to Test for Dead Pixels
Click any color button above to fill your screen with that solid color
Carefully scan the entire screen for any dots that don't match the background
Use arrow keys ←→ to cycle through all colors without exiting
Press Esc or click anywhere to exit the test
Test in a dimly lit room at maximum brightness for best results
⌨️ Keyboard Shortcuts During Test
EscExit test
→ / SpaceNext color
←Previous color
FToggle fullscreen
ClickExit test
💡 Backlight Bleed Test
Backlight bleeding occurs when light from your monitor's backlight leaks around the edges or corners of the screen.
This is most visible on dark screens. For accurate results, test in a completely dark room.
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🔦 What is Backlight Bleeding?
Backlight bleeding is light that leaks around the edges of an LCD display. It's caused by the backlight not being perfectly blocked by the LCD panel's bezels and light-guide plate.
⚠️ Is it Normal?
Some degree of backlight bleed is normal on LCD/LED displays. It becomes a concern when it's visible during normal use, especially when watching dark content or movies.
🆚 Bleed vs. IPS Glow
IPS glow appears as a warm glow from corners that shifts when you change viewing angle. Backlight bleed stays in the same position regardless of viewing angle.
❓ Frequently Asked Questions
A dead pixel is a pixel on your display that no longer functions correctly. It may appear as a permanently black dot (truly dead), a permanently lit white dot, or a pixel stuck on a single color (red, green, or blue). Dead pixels are caused by manufacturing defects or physical damage to the display panel.
A dead pixel receives no power and appears permanently black. A stuck pixel is receiving power but is locked on one color — usually red, green, or blue. Stuck pixels can sometimes be fixed by running a pixel-cycling tool or applying gentle pressure, while truly dead pixels generally cannot be repaired.
Click the "Start Bleed Test" button above to display a full black screen. Turn off all lights in your room and let your eyes adjust for a few seconds. Look at the edges and corners of your display — any bright patches or glow indicate backlight bleeding. The test works best at maximum monitor brightness.
It depends on the manufacturer and the severity. Most manufacturers consider a small amount of backlight bleed acceptable and within spec. If the bleeding is severe and affects normal use, you may be able to claim a warranty replacement. Document the issue with photos taken in a dark room and contact your manufacturer's support.
Yes. This tool works on any display that can open a web browser — monitors, laptops, tablets, TVs, and smartphones. For the most accurate dead pixel and backlight bleed results, use a desktop or laptop monitor and test at maximum brightness in a dark room.
Often yes. Stuck pixels can sometimes be revived by rapidly cycling colors over the affected area for several minutes to an hour, which forces the sub-pixels to refresh. There are also gentle pressure techniques, but these carry a risk of further damage. Truly dead pixels cannot be fixed and typically require a panel replacement.