Dead Pixel Test - Free Online Pixel Checker
Use this free online dead pixel checker in fullscreen to find dead, stuck or bright pixels on a monitor, laptop, phone or TV. No download required.
Quick answer
A dead pixel test uses solid fullscreen colors to make fixed black dots, bright dots and subpixel problems easier to see on monitors, laptops, phones and TVs.
Method: ScreenTestKit generates the test surface in your browser. Results depend on visual inspection; the site does not read or diagnose physical panel hardware.
How to use this test
- Clean the screen carefully so dust does not look like a pixel defect.
- Run black, white, red, green and blue fullscreen screens in a dim but comfortable room.
- Inspect the center, corners and edges from normal viewing distance, then move closer only to confirm a fixed dot.
- Repeat the check after changing brightness or restarting the device if you see a suspicious point.
What to watch for
- A black dot that remains visible on white and color backgrounds may indicate a dead pixel or blocked subpixel.
- A red, green, blue or white point that appears on dark backgrounds is more consistent with a stuck or hot pixel.
- Marks that move when wiped, change with viewing angle or sit above the glass are usually dust, reflection or surface debris.
- Clusters, lines or spreading marks are more serious than a single isolated pixel.
How to interpret results
Black fixed dot
Treat it as a suspected dead pixel only after cleaning and repeating on multiple colors.
Bright colored dot
This is more likely a stuck pixel. Try the stuck pixel test or fixer, but stop if the display becomes hot or uncomfortable.
Many pixels or lines
Document the issue and check return or warranty terms instead of relying on software fixes.
Frequently asked questions
Can a dead pixel be fixed online?
A true dead pixel usually cannot be fixed by software. Bright stuck pixels sometimes improve, but there is no guarantee.
Should I press on the screen?
No. Pressure can damage the panel or coating. Clean gently and use visual tests only.
How many dead pixels qualify for return?
Policies differ by seller, brand, model and country. Save photos and check the warranty or return policy.