Why this tool is useful
Use these patterns to visually inspect uniformity, stuck pixels, gradient banding, scaling softness and obvious backlight variation without installing software.
Browser & Privacy · runs locally
Display Color and Pattern Tester
Show solid colors, grayscale steps, fine grids and gradients in a local full-screen surface for visual panel inspection.
Ready. Your working data stays in this browser.
How it works
Choose a pattern, run the tool and optionally open the generated CSS surface in full screen. The browser draws it locally; the page does not claim to repair pixels.
Practical example
Open the black, white, red, green and blue patterns one at a time in full screen, then compare the grayscale ramp and one-pixel grid at normal display scaling.
Validation
The test reports only browser-observable events and measurements; it does not invent hidden hardware health, temperature or manufacturer specifications.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.