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Monitor Test

Display information, dead pixel test, screen uniformity and color calibration — all on one page.

🖥️ Display Information

📐

Resolution

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🔲

Aspect Ratio

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⚡

Refresh Rate

measuring...

🔍

DPI / PPI

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🎨

Color Depth

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✨

HDR

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🌑

Black Level

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📏

Physical Size (est.)

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⏱ Measuring real refresh rate via requestAnimationFrame... wait ~2 seconds.

💀 Dead Pixel Test

Fills the entire screen with a solid color to make it easier to spot dead, stuck or hot pixels. Look closely at each color — defective pixels appear as dots of a different color.

💡 Click any color to open it fullscreen. Press ESC or click to exit. Use ← → to navigate between colors.

🔆 Screen Uniformity

Displays gradients and patterns to detect backlight bleeding (light leaking at the edges), clouding (irregular patches) and vignetting (darkening at the edges). Click "Fullscreen" to inspect in detail.

Press ESC to exit

🎨 Color Calibration

Reference patterns to check your monitor's calibration. Compare visually with a calibrated monitor or with the manufacturer's specifications.

⬛ Gray Gradient

Should be perfectly smooth from black to white, with no jumps, banding or color dominance. Ideal for calibrating gamma.

🔲 Grayscale (21 shades)

Each block should be visually distinct from the previous one. If some blocks look the same, gamma or contrast are off.

🌈 Primary and Secondary Colors

Pure sRGB color space colors. Should be saturated and distinct, with no unwanted hue dominance.

📊 Gradual Saturation (R · G · B)

From the darkest color (10%) to the most saturated (100%). Checks saturation linearity and tone compression.

👤 Skin Tones (Reference)

Tones used in audiovisual production as a reference for warmth and colorimetry. Useful for photographers and videographers.

🎯 sRGB Primaries — Reference Values

The colors below are the exact primaries of the sRGB color space (IEC 61966-2-1). Well-calibrated monitors should reproduce them faithfully.

〰 Banding Test (8-bit)

256-tone gradient. On well-calibrated 8-bit monitors the transitions are invisible. Visible banding indicates insufficient dithering or an incorrect color profile.

⚠️

Important notice: This site and all of its tests are provided free of charge and on an experimental basis. We are not responsible for any damage caused to your computer or monitor during or after the tests.

How to use: For the dead pixel test, dim the room and look at each color carefully. For uniformity, look especially at the edges and corners for lighter patches (bleeding) or darkening (vignetting). For calibration, compare the colors against a known reference, or use a colorimeter for precise results.

CLICK OR PRESS ESC TO EXIT

← → TO NAVIGATE BETWEEN COLORS

CLICK OR ESC TO EXIT · ← → TO NAVIGATE