Screen & Display Tools
Free full-screen tools for monitor testing, calibration, and display inspection. Zero signup, everything runs in your browser.
Test your screen. Fill it. Measure it.
10 free full-screen display tools. Solid-color screens for dead-pixel checks, RGB test patterns for calibration, live resolution + refresh-rate readouts. Everything runs in your browser — no downloads, no signup.
White Screen
Full-screen pure white — dead-pixel test, tracing lightbox, screen brightness calibration.
Black Screen
Full-screen pure black — stuck-bright pixel test, OLED burn-in reset, screensaver.
Red Screen
Pure red channel — isolates dead red sub-pixels invisible on colored backgrounds.
Green Screen
Pure green channel — isolates dead green sub-pixels. Also useful for chroma-key backdrops.
Blue Screen
Pure blue channel — isolates dead blue sub-pixels. Highest luminance-per-channel test.
Full-Screen Color Picker
Pick or paste any hex color, fill your screen. For tinted calibration tests + custom lighting.
RGB Test Pattern
SMPTE-style color bars with grayscale gradient — quick monitor calibration reference.
Screen Resolution Checker
Live viewport, physical resolution, device pixel ratio, orientation, color depth.
Refresh Rate Test
Measure your display refresh rate — 60/90/120/144 Hz check via requestAnimationFrame.
Full-Screen Timer
Big, visible countdown timer that fills your screen — perfect for classrooms, workouts, meetings.
About these tools
Modern LCD and OLED displays occasionally develop dead or stuck pixels — spots that fail to change color regardless of what should be there. The easiest way to spot them is to fill your entire screen with a single solid color and look for any dot that doesn't match. Different colors reveal different failures: pure red isolates red sub-pixels, pure green isolates green, and so on. A stuck-bright pixel shows most clearly on a black background; a completely dead pixel shows on white.
The RGB Test Pattern uses the classic SMPTE broadcast bars (silver, yellow, cyan, green, magenta, red, blue) plus a grayscale gradient — the industry standard for eyeballing color accuracy and contrast without a colorimeter. The Screen Resolution Checker uses the browser's built-in window.screen and devicePixelRatio APIs to show your true physical pixel count vs the CSS-pixel viewport websites actually render at.