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Color Tools

Color Blindness Simulator

Upload an image and see how it appears to people with different types of color vision deficiency. 100% private — processed in your browser.

How to Use the Color Blindness Simulator

  1. 1. Select a simulation type (e.g. Deuteranopia for green-blindness).
  2. 2. Upload any image — JPG, PNG, or WebP.
  3. 3. See the original and simulated image side by side.
  4. 4. Switch between types to compare different conditions.
  5. 5. Your image never leaves your browser — 100% private.

Frequently Asked Questions

What is color blindness?
Color vision deficiency (CVD) affects about 8% of men and 0.5% of women. The most common types are red-green color blindness (protanopia/deuteranopia), followed by blue-yellow (tritanopia) and complete achromatopsia.
How does this simulation work?
The tool applies color transformation matrices to each pixel of the uploaded image. These matrices approximate how different types of color blindness alter color perception.
Is the simulation 100% accurate?
The simulation is a mathematical approximation based on the Brettel/Viénot method, which is widely used in accessibility tools. It gives a very good indication of what colors look like to people with CVD.
Is my image stored anywhere?
No. Your image is processed entirely in your browser using the Canvas API. Nothing is uploaded to any server.

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