Custom Test Builder
Construct custom display test patterns with fine-grained control over colors, geometry, motion speeds, and pixel mapping. Save presets locally or share patterns via validated URLs.
How Custom Test Builder Works
Choose from static fields, pixel-critical checkerboards, continuous ramps, moving objects, or local dimming stress patterns.
Adjust colors, checker sizes, speeds (px/s), grid line widths, and step counts. Controls dynamically adapt to the active pattern.
Click "Copy Test Link" to share the exact pattern configuration through URL query parameters. No accounts, backend, or cloud sync.
ScreenCheck executes entirely within the browser via HTML5 Canvas 2D. While 1:1 Pixel Mapping mode eliminates fractional coordinate positioning, physical 1:1 display pixel mapping also requires your operating system display scale to be set to 100% and your browser zoom to be set to 100%. Operating system subpixel anti-aliasing (e.g. Windows ClearType or macOS CoreText) operates outside web sandbox control.