About Color Blindness Simulator
A color blindness simulator recolors an image to approximate how people with a color vision deficiency see it. This tool multiplies the red, green, and blue values of every pixel by a 3×3 matrix for the chosen type. Red-green deficiencies (protanopia and deuteranopia) are by far the most common. The matrices are a widely used approximation applied directly to sRGB values, so use the result to spot problems, not as an exact picture of anyone's vision.
How to use Color Blindness Simulator
- Choose an image, or drag it onto the upload area. The file is read by your browser and is not uploaded.
- Set "Type of color vision". The preview updates as you change them.
- Check the preview, then press "Download result" to save the file.
Questions about Color Blindness Simulator
How common is color blindness?
Red-green color vision deficiency affects roughly 1 in 12 men and 1 in 200 women of Northern European descent, with lower rates in some other populations. Tritanopia and complete color blindness are rare.
How do I make a design safe for color-blind users?
Never rely on color alone. Add text labels, icons, or patterns to charts and status indicators, keep strong lightness contrast between neighbouring colors, and avoid pairing red with green as the only difference.
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