Color Blindness Simulator
Simulate how your design or photo looks to viewers with protanopia, deuteranopia, tritanopia and achromatopsia. 100% in your browser.
100% in your browser — files never uploaded.
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How to use the Color Blindness Simulator
- 1Drop an imageAny PNG, JPG or WebP. Stays on your device.
- 2Wait a secondFour simulations render at once.
- 3Download the variantsEach variant is downloadable as PNG to share or audit.
Common forms of colour blindness
Around 8% of men and 0.5% of women have some form of colour vision deficiency. The three most common forms are protanopia (red-blind), deuteranopia (green-blind) and tritanopia (blue-blind). Achromatopsia (total colour blindness) is rare.
Designing inclusively means relying on more than just colour — use shape, position, labels and contrast. This simulator gives you a fast way to audit existing screenshots or photos.
Frequently asked questions
Free?
Yes.
Are images uploaded?
No — simulations run in your browser via Canvas pixel manipulation.
Are the simulations accurate?
They use the standard Brettel/Machado matrices — close enough for design review, not medical advice.
Can I simulate partial deficiencies?
This tool simulates the full dichromatic versions. Anomalous trichromacies (partial) are a topic for specialised tools.
Mobile?
Yes.
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