Color Blindness Simulator
Upload an image and preview how it looks with protanopia, deuteranopia, tritanopia, and achromatopsia using well-established color transformation matrices.
🔒 Processed locally in your browser
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How to use
- Drag and drop an image into the upload area, or click it to choose a file from your device.
- The tool automatically generates four simulated previews: protanopia, deuteranopia, tritanopia, and achromatopsia.
- Compare each preview side by side with the original to see how colors shift for each type of color vision deficiency.
- Click Download under any preview to save that simulated version as a PNG file.
Features
- Simulates protanopia, deuteranopia, tritanopia, and achromatopsia
- Uses well-established color transformation matrices for accurate previews
- Side-by-side comparison grid against the original image
- Download any simulated variant individually as a PNG
- 100% client-side — your image is never uploaded to a server
Frequently asked questions
What is color blindness (color vision deficiency)?
Color blindness, more precisely called color vision deficiency, is a reduced ability to distinguish certain colors. It affects roughly 1 in 12 men and 1 in 200 women worldwide, most commonly as difficulty telling red and green apart.
What's the difference between protanopia, deuteranopia, and tritanopia?
Protanopia and deuteranopia are both forms of red-green color blindness, caused by missing red-sensing (protanopia) or green-sensing (deuteranopia) cone cells. Tritanopia is much rarer and involves missing blue-sensing cones, which makes blue and yellow hard to tell apart.
What is achromatopsia?
Achromatopsia is complete color blindness — the world appears in shades of gray. It's rare and usually comes with other vision issues like light sensitivity, unlike the red-green and blue-yellow deficiencies simulated alongside it here.
How accurate is this simulation?
The previews use published color transformation matrices commonly used in color-blindness simulation tools. They give a good visual approximation of how colors shift, but individual experiences of color vision deficiency vary, and no simulation can perfectly replicate any one person's vision.
Does this tool store or upload my image?
No. Your image is processed entirely in your browser using the Canvas API — it's never uploaded to a server or stored anywhere.