Free Screen Test & Color Tools
Test your monitor online with browser-based tools. Check refresh rate (Hz), dead pixels, FPS, backlight bleed, and full-screen colors—no downloads required.
Screen Tests
Choose a screen test below to check motion, pixels, banding, gamma, sharpness, and other common display issues.
Refresh Rate Test
Measure motion smoothness and verify refresh-rate behavior.
Dead Pixel Test
Locate dead or stuck pixels using clean color fills.
FPS Test
Check browser rendering performance in a lightweight test.
Backlight Bleed Test
Inspect IPS glow, light leakage, and dark-scene uniformity.
Response Time Test
Evaluate ghosting, motion blur, and pixel transition clarity.
Screen Uniformity Test
Spot uneven brightness, tint shifts, dark corners, and panel inconsistencies.
Screen Retention Test
Check temporary image retention, ghost images, and screen persistence.
Monitor Sharpness Test
Evaluate text clarity, edge definition, and fine-detail sharpness.
Gamma Calibration Test
Check gamma balance, grayscale visibility, and tonal transitions.
Screen Burn-in Test
Inspect permanent burn-in, ghost images, and uneven panel wear.
Color Banding Test
Check visible gradient steps, banding, and smooth color transitions.
Monitor Test Patterns
Use fullscreen reference patterns to check sharpness, contrast, color, and geometry.
Display Tools
Use these display tools to check screen resolution, aspect ratio, screen size, and pixel density directly in your browser.
Screen Resolution Checker
Check screen resolution, viewport size, DPR, aspect ratio, and display details in your browser.
Screen Aspect Ratio Calculator
Calculate width, height, and screen aspect ratios such as 16:9, 16:10, 21:9, and 4:3.
Screen Size Calculator
Calculate screen width, height, and diagonal size in inches and centimeters for any aspect ratio.
PPI Calculator
Calculate PPI, dot pitch, and screen pixel density using display size and resolution.
Popular Colors
Browse All Colors
Unlock the Utility of Your Display
Pixel Testing
Easily identify stuck or dead pixels by cycling through high-contrast RGB backgrounds.
OLED Power Saving
Use our true-black screen tool to turn off individual pixels on OLED panels, saving battery.
Creative Tool
Use full-screen colors as reference lighting for photography, mood boards, or webcam ambient lighting.
Simple & Fast
No downloads, no apps. Access professional-grade diagnostics instantly from any browser.
What You Can Test Online
ScreenOfColors is a browser-based screen test hub for checking common display problems and opening full-screen color pages. You can run a quick screen test for refresh rate, dead pixels, backlight bleed, color banding, screen retention, and sharpness, then use display tools to check screen resolution, aspect ratio, screen size, and PPI.
If you need a simple color test, you can also open solid full-screen colors instantly for visual checks, cleaning, lighting, or dead pixel inspection. Everything runs directly in the browser, so there is no download, setup, or account required.