Color Blindness Simulator
Preview how an image looks to users with deuteranopia, protanopia, tritanopia and other types of colour blindness. Free, browser-based.
🖼️ Image Tools
Free
Browser-based
Why Use a Color Blindness Simulator?
Around 8% of men and 0.5% of women experience some form of colour vision deficiency. Testing designs with a simulator ensures graphics, charts and interfaces remain clear for all users — a cornerstone of accessible design (WCAG).
Vision Types Simulated
| Type | Description | Prevalence (males) |
|---|---|---|
| Protanopia | Absent red (L) cones | ~1% |
| Deuteranopia | Absent green (M) cones | ~1% |
| Tritanopia | Absent blue (S) cones | Rare |
| Achromatopsia | No colour perception (greyscale) | Very rare |
| Protanomaly | Weakened red cones | ~1% |
| Deuteranomaly | Weakened green cones — most common CVD | ~5% |
| Tritanomaly | Weakened blue cones | Rare |
How It Works
Each pixel's RGB values are multiplied by a 3×3 colour transformation matrix based on peer-reviewed research (Vienot et al.). The result approximates what someone with that vision deficiency would perceive. All processing uses the browser's Canvas API — your image never leaves your device.