Color Blindness Simulator
Preview how your image looks to people with 8 types of color vision deficiency. Browser-based, instant results.
Drop an image or click to browse
JPEG, PNG, WebP supported
What Is a Color Blindness Simulator?
A color blindness simulator applies a color vision deficiency (CVD) transformation matrix to an image, showing how it appears to people with various types of color blindness. This tool supports 8 vision types including Protanopia (red-blind), Deuteranopia (green-blind), Tritanopia (blue-blind), and Achromatopsia (complete color blindness). Matrices are derived from peer-reviewed research by Viénot, Brettel, Mollon, and Machado.
How to Use
- Upload a JPEG, PNG, or WebP image
- All 8 simulations are rendered instantly in a grid
- Click any tile to enlarge it for a closer look
- Click Download on any simulation to save it as a PNG
- All processing happens in your browser — no data is uploaded
Features
- 8 color vision types: Normal, Protanopia, Protanomaly, Deuteranopia, Deuteranomaly, Tritanopia, Tritanomaly, Achromatopsia
- Scientifically accurate linear-sRGB matrix transformations
- Side-by-side grid view for quick comparison
- Click-to-enlarge for detailed inspection
- Per-simulation PNG download
- 100% client-side — images never leave your device
FAQ
What is the difference between -opia and -anomaly types?
-opia (e.g., Deuteranopia) means the cone type is completely absent — a dichromatic condition. -anomaly (e.g., Deuteranomaly) means the cone is present but shifted in spectral sensitivity — an anomalous trichromacy condition. Anomaly types typically produce milder color confusion than full -opia conditions.
Why should designers use this tool?
About 8% of males and 0.5% of females have some form of color vision deficiency. Checking UI designs, charts, maps, and marketing materials with this simulator helps ensure that important information (error states, data series, call-to-action contrast) is distinguishable for all users, not just those with normal color vision.
How accurate are these simulations?
The matrices are based on peer-reviewed perceptual models and are the same approach used in professional accessibility tools. They operate in linear sRGB space with proper gamma linearization and re-encoding. While no simulation perfectly replicates individual perception, these are the best available approximations for design evaluation.