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Monitor Calibration Test

Check Contrast, Gamma 2.2 & Dead Pixels

Click to change color. Press ESC to exit.
Pro Tip: Click "Toggle Fullscreen" to remove browser distractions. Use your monitor's physical buttons to adjust settings until these patterns look correct.
1. Black Level (Shadow Detail)
You should be able to read all numbers from 1 to 10. If the first few boxes blend completely into the pure black background, your monitor's contrast is too high or brightness is too low (crushed blacks).
1
2
3
4
5
6
7
8
9
10
2. White Saturation (Highlight Detail)
You should be able to read all numbers from 245 to 254. If the last few boxes blend into the pure white background, your monitor's contrast is set too high (blown-out highlights).
245
246
247
248
249
250
251
252
253
254
3. Gamma Calibration (2.2)
Step back a few feet from your monitor or blur your eyes. The solid gray box in the center should perfectly blend into the striped background. If the box looks much darker or lighter than the background, your Gamma setting is incorrect.
2.2
4. Sharpness & Pixel Mapping
This is a 1-pixel checkerboard pattern. It should look like an even, flat gray box. If you see shimmering, wave-like interference patterns, or halos, your monitor's "Sharpness" setting is turned up too high. Lower it until the box looks flat.
5. Grayscale Banding Test
This gradient should transition perfectly smoothly from pure black to pure white. If you see harsh vertical lines, steps, or non-gray colors (like green/magenta tints), your monitor has color banding issues or low bit-depth.
6. RGB Color Clipping
These pure Red, Green, and Blue gradients should be completely smooth. If the colors suddenly become a solid block on the right side, your monitor's color saturation is pushed too high.

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What we do

Key Features

  • Black Level Test: Precise 1% to 10% blocks to fix crushed shadows.
  • Gamma 2.2 Tuning: Visual blending test to calibrate mid-tones.
  • Sharpness Checker: 1-pixel checkerboard to stop over-sharpening halos.
  • RGB Clipping Test: Prevent oversaturation with Pure RGB gradients.
  • Dead Pixel Tester: Fullscreen RGB cycle to easily spot hardware defects.
  • Fullscreen UI: Hides browser distractions for accurate eye calibration.

How do I use it?

Step 1: Click "Toggle Fullscreen" to remove browser menus. Step 2: Use your monitor's physical buttons to adjust Brightness, Contrast, and Sharpness until the patterns match the descriptions.

How do I test Dead Pixels?

Click the green Dead Pixel Test button. Your screen will turn pure red. Click anywhere on the screen to cycle through Green, Blue, Black, and White to spot any broken or stuck pixels on your display.

Is this tool free?

Yes, this calibration suite is 100% Free. There are no downloads, no sign-ups, and no paywalls. It works instantly right inside your browser.

What devices are supported?

This tool is perfect for calibrating Desktop Monitors, Gaming Laptops, and even Smart TVs (if accessed via a web browser). The test patterns are universally mathematically accurate.

Privacy & Security

Your privacy is our priority. Since this tool runs entirely Client-Side (in your browser using CSS/HTML), no data is collected or sent to our servers.