Dead Pixel Test — Check & Fix Your Screen Online
Free online tool to check any display for dead, stuck, or hot pixels. Includes 21 test patterns across solid colors, gradients, advanced checker patterns, and text sharpness tests — plus a built-in stuck pixel repair tool and magnifier loupe for subpixel inspection.
Detect dead, stuck, and hot pixels with professional test patterns and repair tools
Features
How to Test Your Screen for Dead Pixels
Select Quick Auto-Test for a fast scan or Manual Test for detailed inspection of specific patterns.
The test fills your entire screen. Look for pixels that don't match the displayed color — they may be dead, stuck, or hot.
Click on any suspicious pixel to mark it. Use the magnifier (press M) for close-up inspection at 8× zoom.
After testing, review your defect map with exact coordinates. Use the Pixel Repair tool to fix stuck pixels with rapid color cycling.
Frequently Asked Questions
What is the difference between dead, stuck, and hot pixels?
A dead pixel is permanently off (appears black). A stuck pixel is permanently on in one color (red, green, or blue). A hot pixel appears white or abnormally bright. Dead pixels usually cannot be fixed, but stuck pixels can often be repaired.
Can stuck pixels be fixed?
Yes, in many cases. The Pixel Repair tool rapidly cycles RGB colors at 60fps, which can help unstick a stuck pixel. Position the repair window over the defective pixel and run it for 10–20 minutes. Success rate is approximately 60%.
How many dead pixels are acceptable?
Most manufacturers allow 1–5 dead pixels under warranty (ISO 9241-307). However, a dead pixel in the center of the screen is more noticeable than one at the edge. Check your manufacturer's specific policy.
Does this test work on phones and tablets?
Yes, the test works on any device with a modern web browser. On mobile devices, tap to mark defects and swipe to navigate between patterns. Long-press to activate the magnifier.
What is the magnifier for?
The magnifier provides 8× zoom of the area around your cursor, with pixel-perfect rendering (no smoothing). This helps detect subpixel defects — when only one of the three subpixels (red, green, or blue) within a pixel is stuck.
Is my screen data sent anywhere?
No. This tool runs entirely in your browser. No screen data, screenshots, or test results leave your device. Your privacy is fully protected.
