Color Blindness Simulator

Designing accessible color schemes requires understanding how your visuals appear to users with color vision deficiencies. This tool lets you upload any image and instantly simulate four types of color blindness: Protanopia (red cone absence), Deuteranopia (green cone absence), Tritanopia (blue cone absence), and Achromatopsia (complete color blindness). The simulation uses established LMS color space transformation matrices based on the Brettel method, which is widely accepted as the most accurate computational model for color blindness simulation. The original and simulated images are displayed side by side for easy comparison. All processing happens locally using the HTML5 Canvas API — your images are never uploaded to any server. Download the simulated version to include in accessibility reports or design reviews.