Monitor Test: Dead Pixels, Backlight Bleed, Burn-in & Ghosting Check
Comprehensive monitor test suite: check for dead pixels, backlight bleed, IPS glow, OLED burn-in & motion ghosting. Free diagnostics for all screens.
Click the button above to enter fullscreen mode. Press ESC or click anywhere to exit.
Screen Cleaning Mode - Best Way to Clean Fingerprints & Dust
This screen cleaning mode provides a fullscreen black background that makes dust, fingerprints, and smudges clearly visible on your monitor or TV screen. The lock feature prevents accidental touches from closing the screen while you clean - especially useful for touchscreen devices. Set an optional timer (30 seconds to 5 minutes) to ensure thorough cleaning, and adjust brightness to protect OLED screens from static image retention during extended cleaning sessions.
🧹 Safe Screen Cleaning Practices
Use Microfiber Cloths
Always use a clean, soft microfiber cloth. Paper towels, tissues, and rough cloths can scratch your screen. Microfiber cloths are designed to pick up dust and smudges without leaving scratches or streaks.
Never Spray Directly on Screen
Always spray cleaning solution on the cloth, never directly on the screen. Excess liquid can damage electronics, especially on touchscreens or displays with exposed edges. A slightly damp cloth is usually sufficient.
Gentle Circular Motions
Gently wipe in circular motions. Avoid pressing too hard, especially on touchscreens. The black screen makes dust and smudges clearly visible, so you can see exactly where cleaning is needed.
⚙️ Screen Cleaning Features
Lock Mode
Enable lock mode to prevent accidental exits while cleaning. When locked, the screen won't close if you accidentally click, tap, or press keys. This is especially useful for touchscreens.
Cleaning Timer
Set a cleaning timer (30 seconds, 1 minute, 2 minutes, or 5 minutes) to track your cleaning session. The timer displays prominently and helps ensure thorough cleaning without rushing.
Brightness Control
Adjust brightness (0-100%) to optimize visibility and protect your display. Use lower brightness for OLED screens to prevent burn-in, and higher brightness for LCD screens to make dust more visible.
🔗 Related Display Tests
Pixel & Screen Tests
Find display defects
After cleaning, test your screen for dead pixels and display defects.
Calibration Tests
Color accuracy & quality
Check color accuracy and gradient banding after cleaning your display.
This screen cleaning mode provides a fullscreen black background that makes dust, fingerprints, and smudges clearly visible on your monitor or TV screen. The lock feature prevents accidental touches from closing the screen while you clean - especially useful for touchscreen devices. Set an optional timer (30 seconds to 5 minutes) to ensure thorough cleaning, and adjust brightness to protect OLED screens from static image retention during extended cleaning sessions.
How to Use Color Palette & Display Tester
Starting Screen Cleaning Mode
Click "Screen Cleaning" or press keyboard shortcut 'C' to activate screen cleaning mode. The screen will turn black, making dust, fingerprints, and smudges clearly visible. This provides an ideal surface for safe screen cleaning.
Using Lock Mode
Enable lock mode to prevent accidental exits while cleaning. When locked, the screen won't close if you accidentally click or press keys. This is especially useful when cleaning touchscreens or when you need both hands for cleaning. Press Escape to unlock and exit.
Setting a Cleaning Timer
Optionally set a cleaning timer (30 seconds, 1 minute, 2 minutes, or 5 minutes) to track your cleaning session. The timer displays prominently and alerts you when time is up. This helps ensure thorough cleaning without rushing.
Adjusting Brightness
Use the brightness slider to adjust screen brightness (0-100%). Lower brightness is better for OLED screens to prevent burn-in during cleaning. Higher brightness makes dust and smudges more visible on LCD screens.
Safe Cleaning Practices
Always use a microfiber cloth for cleaning. Never spray cleaning solution directly on the screen - spray on the cloth instead. Gently wipe in circular motions. Avoid pressing too hard, especially on touchscreens.
Calculator Features
Lock Mode
Prevents accidental exits while cleaning, especially useful for touchscreens. Screen stays active until you press Escape.
Cleaning Timer
Set a timer (30 seconds to 5 minutes) to track your cleaning session and ensure thorough coverage.
Brightness Control
Adjustable brightness slider (0-100%) to optimize visibility for your screen type and protect OLED displays.
Dust & Smudge Visibility
Black screen background makes dust, fingerprints, and smudges clearly visible for thorough cleaning.
Complete Function List
- Fullscreen black cleaning surface:
- Lock mode for touchscreens:
- Timer options (30s, 1m, 2m, 5m):
- Adjustable brightness control:
- Dust and smudge visibility:
- Keyboard shortcut (C):
- OLED-safe brightness options:
- Safe cleaning guidance:
- Works on all devices:
- No app installation needed:
Common Calculations & Examples
Example 1: Cleaning a Touchscreen Tablet
Problem: Your tablet screen is covered in fingerprints and you need to clean it without accidentally triggering apps
Steps:
- Open the screen cleaning mode in your browser
- Enable lock mode before starting to clean
- Set a 2-minute timer for thorough cleaning
- Reduce brightness to 30-40% for OLED displays
- Clean with a microfiber cloth, starting from the center and moving outward
- Press Escape when finished to exit lock mode
Explanation: Lock mode prevents touch inputs from closing the cleaning screen, letting you clean the entire surface without interruption.