Color Blindness Simulator - Test Image Accessibility

Simulate how images appear with different types of color blindness. Test protanopia, deuteranopia, tritanopia, and achromatopsia. Browser-based, private.

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Drop your image here or click to browse

Test graphics, charts, UI designs, or any visual content

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Frequently Asked Questions

This tool simulates the four main types: Protanopia (red-blind, 1% of males), Deuteranopia (green-blind, 1% of males), Tritanopia (blue-blind, 0.001% of population), and Achromatopsia (complete color blindness, very rare). Each uses scientifically accurate color transformation matrices.

The simulations use established color transformation matrices based on research into color vision deficiencies. While they provide a good approximation of how people with color blindness see images, individual experiences may vary slightly due to the spectrum nature of these conditions.

About 8% of men and 0.5% of women have some form of color vision deficiency. Testing ensures your graphics, data visualizations, UI designs, and marketing materials are accessible to everyone. Critical information should never rely solely on color to convey meaning.

Protanopia is red color blindness (missing L-cones), making red appear dark and hard to distinguish from green. Deuteranopia is green color blindness (missing M-cones), also confusing red and green but in a slightly different way. Both are types of red-green color blindness affecting about 6-8% of males.

Tritanopia is blue-yellow color blindness (missing S-cones), making it difficult to distinguish blue from green and yellow from violet. It's much rarer than red-green color blindness, affecting about 1 in 10,000 people equally across genders.

Yes! Use the side-by-side view to compare the original image with any color blindness simulation. You can also toggle between simulations quickly to see how different types of color blindness affect your image differently.

Use patterns, textures, labels, or shapes in addition to color. Ensure sufficient contrast between elements. Avoid red-green and blue-yellow as the only distinguishing factors. Use colorblind-safe palettes with distinct hues and lightness values.

Upload any common image format including PNG, JPEG, WebP, GIF, and SVG. The tool works on screenshots, data visualizations, infographics, UI mockups, charts, graphs, and any visual content where color conveys information.

No. All color transformation happens entirely in your browser using the Canvas API and color matrices. Your images never leave your device. This tool works completely offline after the page loads, ensuring total privacy.

Yes, click the download button to save the simulated view as a PNG image. This is useful for including accessibility examples in presentations, documentation, or design reviews to demonstrate how your content appears to people with color vision deficiencies.

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

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