Color Blindness Simulator
See how an image looks to people with protanopia, deuteranopia, tritanopia or full color blindness — check your designs for accessibility.
What Is the Color Blindness Simulator?
The Color Blindness Simulator shows how any image or design appears to people with color-vision deficiencies. Upload a picture, chart, map or UI screenshot and preview it under protanopia (reduced red), deuteranopia (reduced green — the most common type), tritanopia (reduced blue) or achromatopsia (total color blindness, grayscale). It applies the standard color-transform matrices to every pixel on a canvas so you can instantly spot whether important information relies on color alone. Roughly 1 in 12 men and 1 in 200 women have some form of color blindness, so this is a quick accessibility check for designers, teachers and anyone making charts or diagrams. Everything runs in your browser and you can download the simulated image.
How It Works
Choose an image, pick a color-vision type to simulate, and the preview updates instantly. Try each type to see whether your reds and greens (or blues) stay distinguishable, then download the result to share.
When to Use It
Use it when designing charts, graphs, maps, infographics, dashboards, slides or app UI to make sure color-coded information is still readable to color-blind viewers — and to choose safer color palettes.
Frequently Asked Questions
- Which types can it simulate?
- Protanopia (no red), deuteranopia (no green — most common), tritanopia (no blue) and achromatopsia (complete, grayscale). Each uses a standard color-transformation matrix.
- Is this a diagnostic test?
- No — it simulates how content looks to others; it isn't a medical test for your own color vision. It's an accessibility and design tool.
- Are my images uploaded?
- No. The simulation runs entirely in your browser on a canvas; nothing is sent to a server.
Last reviewed: 2026-06-27