Dead and Stuck Pixel Test for Monitors
Solid black, white and RGB fields make pixels that remain dark or lit easier to locate.
Online Screen Tester for Monitor and Display Quality
Inspect dead pixels, color uniformity, gradients, sharpness, contrast and motion handling with a complete set of full-screen test patterns.
Quick test guide
Use the arrow keys or on-screen controls to move between patterns.
Move the pointer to the bottom edge to reveal the controls.
Press Esc or choose Exit when you finish.
Start with black, white and RGB, then use gradients and motion tests.
Detected display information
Screen resolution-- × --
Pixel ratio1.0
Color depth24 bit
Pixel depth24 bit
Solid color tests
Reveal dead or stuck pixels and uneven brightness.
Gradient and tone tests
Check banding, gamma, shadow detail and color transitions.
Sharpness, contrast and motion patterns
Inspect scaling, text clarity, contrast response and ghosting.
What a Full-Screen Online Monitor Test Can Reveal
Each pattern isolates a different display characteristic so you can distinguish pixel faults from panel, scaling or motion issues.
Monitor Sharpness and Native Resolution Test
Fine grids, lines and text expose scaling blur, uneven sharpness and incorrect display resolution.
Full-Screen Color Uniformity Test Online
Patterns cover the visible display so edges, corners and subtle uniformity problems are easier to compare.
Online Screen Tests for Common Display Problems
Use the patterns that match the issue you see instead of changing unrelated monitor settings.
Check a new monitor
Recommended firstTest solid colors, dark contrast and gradients before the return window closes.
Inspect a phone or tablet
Open the tool on the device and check the full panel for pixel, tint and OLED uniformity issues.
Evaluate color transitions
No calibration claimGradients and color bars reveal banding and clipping, but hardware calibration still requires a colorimeter.
Look for ghosting and blur
Moving blocks and scrolling patterns help compare response-time and overdrive settings.
How to Read Your Online Screen Test Results
A test pattern does not diagnose hardware by itself. Compare the same mark across several colors before deciding whether it comes from a pixel, the backlight, image scaling or motion processing.
How to Tell a Dead Pixel from a Stuck Pixel
A dot that stays black on white, red, green and blue is likely a dead pixel. A dot that remains colored or bright on every background is more likely stuck. Clean the panel gently and repeat the test so dust is not mistaken for a defect.
How to Check Monitor Backlight Bleed and Uniformity
View black and dark-gray patterns in a dim room at your normal brightness. Edge glow that changes as you move may be IPS glow; a fixed bright patch can indicate backlight bleed. Use mid-gray screens to compare tint and brightness across the panel.
How to Test Monitor Ghosting and Motion Blur
Watch the trail behind moving shapes. A faint trail can be normal display blur, while a bright or dark inverse outline often points to aggressive overdrive. Change only one response-time setting between comparisons.
Frequently Asked Questions About Online Monitor Testing
Practical guidance for getting reliable results without changing or damaging your display.
Can an online screen test fix a dead pixel?
No. It can help identify a dead or stuck pixel. A truly dead pixel usually needs panel service or replacement.
Which patterns should I run first?
Begin with black, white, red, green and blue. Then use grayscale gradients, fine grids and motion patterns for a broader check.
Does this tool calibrate monitor colors?
No. It helps you spot visible issues. Accurate color calibration requires a colorimeter and a suitable display profile.
Is the flashing pattern safe?
Avoid flashing tests if you are sensitive to flashing light or have photosensitive epilepsy. Stop immediately if you feel discomfort.