Pixel Grid and Sharpness Test
Display a fine pixel grid to inspect native-resolution mapping, sharpness, scaling, overscan, focus, and one-to-one pixel rendering.
Alternating lines and grid patterns reveal blur, uneven scaling, chroma loss, overscan, and failure to map content to physical pixels cleanly. Set the display to its native resolution, use 100 percent scaling where practical, disable overscan, and inspect lines without browser zoom.
What does this test measure?
Alternating lines and grid patterns reveal blur, uneven scaling, chroma loss, overscan, and failure to map content to physical pixels cleanly.
Why is this test important?
Display a fine pixel grid to inspect native-resolution mapping, sharpness, scaling, overscan, focus, and one-to-one pixel rendering.
How do you run the test?
Set the display to its native resolution, use 100 percent scaling where practical, disable overscan, and inspect lines without browser zoom.
How should results be interpreted?
Crisp single-pixel lines suggest correct mapping; merged, colored, cropped, or blurry lines may indicate scaling or signal-format issues.
Normal and problematic results
Crisp single-pixel lines suggest correct mapping; merged, colored, cropped, or blurry lines may indicate scaling or signal-format issues.
Technical limitations
High-DPI scaling and browser zoom may intentionally combine pixels, so the result must be interpreted with system settings.
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?
Correct resolution, refresh rate, scaling, HDMI/DisplayPort format, TV PC mode, sharpness, and browser zoom.
Example Result Explanation
Frequently Asked Questions
What does the pixel grid pattern tell me?
A fine alternating pattern shows whether your display is rendering at its native resolution. At native resolution the grid looks clean and even; if it shimmers, blurs or produces moire, the image is being scaled.
Why does my text look soft even at the right resolution?
Scaling settings, a non-native resolution set in the operating system, or sharpness turned up on the monitor all soften text. On a connected television, an overscan setting is a frequent cause.
Does a higher pixel density always mean sharper?
Only up to the point your eyes can resolve, which depends on viewing distance. A dense phone screen held close and a large monitor at arm length can look equally sharp despite very different pixel counts.