Online Screen and Monitor Tests
Open a complete collection of browser-based screen and monitor tests for pixels, colors, contrast, gradients, motion, uniformity, clouding, OLED image retention, and refresh timing.
The center displays controlled full-screen colors, patterns, grids, gradients, and moving references so visible screen behavior can be inspected consistently. Use the display's native resolution, clean the panel, dim distracting room reflections, enter full screen, and complete each visual check one at a time.
What does this test measure?
The center displays controlled full-screen colors, patterns, grids, gradients, and moving references so visible screen behavior can be inspected consistently.
Why is this test important?
Open a complete collection of browser-based screen and monitor tests for pixels, colors, contrast, gradients, motion, uniformity, clouding, OLED image retention, and refresh timing.
How do you run the test?
Use the display's native resolution, clean the panel, dim distracting room reflections, enter full screen, and complete each visual check one at a time.
How should results be interpreted?
Look for persistent dots, uneven brightness, missing tones, visible gradient steps, trails, or timing instability, then repeat the relevant dedicated test.
Normal and problematic results
Look for persistent dots, uneven brightness, missing tones, visible gradient steps, trails, or timing instability, then repeat the relevant dedicated test.
Technical limitations
Browser patterns support visual inspection but cannot electronically read panel health, warranty status, cable quality, or internal monitor diagnostics.
Why can the score decrease?
Unstable measurements, denied permissions, unsupported browser APIs, background load, power saving, or an incomplete test can affect the result. When a score changes, the result screen explains the reason.
What should you do if a problem is found?
Repeat the check with another browser, cable, port, device, and factory display preset before concluding the panel is defective.
Example Result Explanation
Frequently Asked Questions
Which screen test should I run first?
Start with the solid colour screens, which reveal dead and stuck pixels fastest. Then run uniformity and black level to judge backlight behaviour, and finish with motion if you care about gaming or fast video.
Do I need full screen for these tests to be accurate?
Yes. Browser toolbars and window borders hide parts of the panel and change how your eye judges brightness. Use full screen, the native resolution of the monitor and a dim room.
Can these patterns damage my screen?
Standard colour and contrast patterns are harmless. The only reasonable caution concerns OLED panels, where a static bright image left on screen for a long period is best avoided. Keep the still patterns brief on OLED.