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Display Test - ApexCheck

Comprehensive display testing for resolution, refresh rate, dead pixels, and color accuracy to ensure your monitor is working properly.

Display Basic Information

Screen Size

Unknown

Resolution

0 × 0

Refresh Rate

0 Hz

Color Depth

0 bits

Pixel Density

0 PPI

Orientation

Landscape

Resolution Test

Current Resolution

0 × 0

Refresh Rate Test

Detected Refresh Rate

0 Hz

Screen API value: 0 Hz

Dead Pixel Test

Select a color and enter full screen. Carefully check the entire display for any stuck bright or dark pixels.

Display Test - ApexCheck

Comprehensive display testing for resolution, refresh rate, dead pixels, and color accuracy to ensure your monitor is working properly.

Our display test tool provides a comprehensive evaluation of your screen's performance, helping you understand various technical specifications. With an easy-to-use interface, you can quickly test your monitor's resolution, refresh rate, dead pixels, and color accuracy.
- Real-time display basic information - Accurate resolution and refresh rate detection - Multi-color dead pixel detection - Professional color accuracy and grayscale testing - Full-screen detection mode support - Compatible with various display types
1. Open the display test page, basic information will be shown automatically 2. Click "Test Now" to view detailed resolution information 3. Adjust the refresh rate slider and observe screen flickering 4. Use dead pixel detection and switch colors to find screen defects 5. View grayscale and color gradient tests to evaluate display performance 6. Click "Reset Detection" to restart testing if needed
This tool uses JavaScript screen APIs and CSS animation technology, running directly in your browser without any software installation. Test results are based on screen information provided by the browser and visual tests, serving as reference indicators for display performance.
- Quality testing after purchasing a new monitor - Regular checks for display performance changes - Gamers optimizing display settings - Designers evaluating color accuracy - Office users ensuring display quality
Q: Are the test results accurate? A: They are best-effort and based on what the browser can read/measure. Use them as a reference; hardware tools are needed for professional calibration. Q: Which browsers are supported? A: Modern browsers like Chrome, Edge, Firefox, and Safari. Q: Why do some values differ from my OS settings? A: The browser reports viewport/device metrics and may be affected by DPI scaling, fullscreen mode, power saving, and background throttling. Q: How long does dead pixel detection take? A: Take your time—scan each solid color for 10–15 seconds (longer on large panels) and check edges/corners. Q: Is it safe for OLED? A: Yes for normal testing, but avoid leaving a static bright screen for a long time. Q: Can multiple displays be tested? A: This page focuses on the current display. To test another monitor, move the browser window to that monitor and rerun the tests.