# ScreenTestPro

> A comprehensive online tool to instantly verify and diagnose your monitor or display's visual quality. Test for dead pixels, refresh rates, backlight bleed, and more.

ScreenTestPro is the ultimate web-based monitor health check utility. It provides a full suite of professional-grade diagnostic tools that run directly in your browser without requiring any software installation. Whether you are checking a new 4K gaming monitor, a smartphone screen, or a laptop display, ScreenTestPro has the precise tests needed to ensure hardware perfection.

## Core Features
- **Dead Pixel Test & Stuck Pixel Fixer:** Full-screen color cycling to easily spot dead, stuck, or hot pixels. Includes a rapid flashing tool to attempt repairs on stuck pixels.
- **Refresh Rate Checker (Hz Test):** Real-time, UFO-style frame rate measurement to verify your screen's actual refresh rate (60Hz, 144Hz, 240Hz+).
- **Response Time & Ghosting Test:** Visualize motion blur and overdrive artifacts to tune your monitor for optimal gaming performance.
- **Backlight Bleed & IPS Glow Test:** Dark room testing patterns to find light leakage or clouding on LCD panels.
- **Color Accuracy Test:** Detailed grayscale, saturation, and gradient patterns to check for color banding and contrast crush.
- **Viewing Angle Test:** Evaluates color shifting and contrast loss when viewing screens off-center (vital for TN vs IPS comparisons).
- **Text Clarity Test:** Validates sub-pixel rendering and sharpness for comfortable reading and office work.
- **Input Lag Test:** Measures total system latency (mouse + OS + monitor delay).

## Use Cases
- Verifying the health of a brand new monitor or TV.
- Diagnosing issues on second-hand displays.
- Tuning monitor settings (Overdrive, brightness, color, refresh rate) for gaming or professional work.
- Testing mobile device screens for pixel defects.

## More Information
- [Official Website](https://screentestpro.com/)
- [Dead Pixel Test](https://screentestpro.com/dead-pixel-test/)
- [Refresh Rate Test](https://screentestpro.com/refresh-rate-test/)
- [Response Time Test](https://screentestpro.com/response-time-test/)