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 calculation is deterministic and explains validation errors instead of silently changing invalid input.
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.