Free Monitor Color Test for Uniformity, Banding, Tint, and Brightness
Inspect your display for visible tint shifts, brightness non-uniformity, banding, patch differences, and edge variation using fullscreen fields and controlled patterns from the site palette.
Monitor Color Test for Uniformity, Banding, Tint, and Brightness
Built for a complete diagnostic workflow
Fullscreen solid-color fields
Monitor Color Uniformity Test workflow feature designed for practical browser use.
Dark-field uniformity check
Monitor Color Uniformity Test workflow feature designed for practical browser use.
Light-field uniformity check
Monitor Color Uniformity Test workflow feature designed for practical browser use.
Cyan and purple field checks
Monitor Color Uniformity Test workflow feature designed for practical browser use.
Five-zone comparison grid
Monitor Color Uniformity Test workflow feature designed for practical browser use.
Brightness-step pattern
Monitor Color Uniformity Test workflow feature designed for practical browser use.
Gradient banding pattern
Monitor Color Uniformity Test workflow feature designed for practical browser use.
Edge and corner inspection prompts
Monitor Color Uniformity Test workflow feature designed for practical browser use.
User defect-note capture
Monitor Color Uniformity Test workflow feature designed for practical browser use.
Pattern navigation presets
Monitor Color Uniformity Test workflow feature designed for practical browser use.
Local browser processing
Monitor Color Uniformity Test workflow feature designed for practical browser use.
Copyable diagnostic summary
Monitor Color Uniformity Test workflow feature designed for practical browser use.
How to interpret this monitor color uniformity test
A visual monitor color test can reveal obvious uniformity problems such as one corner looking warmer, darker, brighter, or more saturated than another. It cannot replace a colorimeter or spectrophotometer for quantitative calibration.
View each solid field from your normal centered position first, then inspect corners and edges. Allow the display to warm up and keep brightness, local dimming, HDR, night-light, and color-mode settings consistent while comparing patterns.
Gradient and brightness-step patterns can reveal visible banding or crushed shadow/highlight detail. Browser color management, panel bit depth, dithering, operating-system settings, and content pipeline can all affect what you see.
Use written notes to record where a problem appears. If the location changes when you move your head, viewing angle may be contributing to the perceived difference.
What the browser can and cannot tell you
| Signal | What it represents | How to use it |
|---|---|---|
| Solid dark field | Near-black uniformity and glow | Look for bright patches, edge glow, or tint variation |
| Solid light field | Brightness and tint uniformity | Compare center, edges, and corners |
| Cyan/purple fields | Chromatic uniformity within permitted palette | Look for regional hue or saturation differences |
| Brightness steps | Separation of tonal blocks | Missing steps can indicate clipping or processing |
| Gradient pattern | Smooth tonal transition | Visible abrupt bands can indicate limited precision or processing |
Build a better troubleshooting habit
Start with a baseline
Run the primary diagnostic before changing settings so you have a comparison point.
Repeat the test
One sample can be misleading. Repeat the check and compare the pattern, not only the best number.
Change one variable
When troubleshooting, change one device, browser, permission, cable, or setting at a time.
Separate browser from hardware
A browser result reflects only the parts of the input or output path that the page can observe.
Document the environment
Keep browser, operating system, device connection, scaling, or permission context with the result.
Use the next diagnostic
Open a related ready page when the result suggests a neighboring part of the device or browser stack.
Three quick questions
Finish with a quality review
Recent saved milestones on this device
Continue without a dead end
Free Monitor Color Test for Uniformity, Banding, Tint, and Brightness: FAQ
Can this calibrate my monitor?+
No. It is a visual inspection tool; accurate calibration requires measurement hardware and suitable software.
Should I use fullscreen?+
Fullscreen is recommended because it reduces surrounding page elements and makes field uniformity easier to inspect.
Why does a corner look different when I move my head?+
Viewing-angle behavior can change perceived brightness and color, especially on some panel technologies.
Can HDR affect the result?+
Yes. HDR, local dimming, dynamic contrast, night-light, and vendor image processing can all change the appearance.
What should I record?+
Note the pattern, approximate screen region, viewing position, brightness setting, and whether the issue persists across applications.
Use the result responsibly
This tool reports what a browser can observe or calculate in the current environment. Device firmware, drivers, operating-system processing, permissions, transport, display refresh, acoustic conditions, and browser implementation can add behavior that this page cannot isolate.
External technical reference: MDN: CSS color values ↗.