Upload any image and instantly simulate how it appears to someone with color vision deficiency (CVD). Choose from protanopia, deuteranopia, tritanopia, anomalous trichromacy, or achromatopsia. Simulation uses the scientifically validated Brettel-Viénot-Mollon (1997) model. All processing runs locally in your browser—your images are never uploaded to a server.
Free Online Color Blindness Simulator
See How Your Photos and Designs Look Through the Eyes of People with Color Vision Deficiency
Upload Your Image
All processing happens locally in your browser. Your image is never uploaded.
Upload an image to simulate
(or drag and drop, or paste from clipboard)
Protanopia (red-blind)
Protanomaly (red-weak)
Deuteranopia (green-blind)
Deuteranomaly (green-weak)
Tritanopia (blue-blind)
Tritanomaly (blue-weak)
Achromatopsia (monochrome)
Result
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Supported Vision Types
- Protanopia & protanomaly — red cone deficiency (most common red-green CVD)
- Deuteranopia & deuteranomaly — green cone deficiency (red-green CVD)
- Tritanopia & tritanomaly — blue-yellow CVD (rare)
- Achromatopsia — complete color blindness (grayscale vision)
- Side-by-side comparison of original and simulated view
- 100% private — images processed entirely in your browser
How to Use
- Upload a photo, drag and drop, or paste from clipboard
- Select a color vision type (e.g. deuteranopia for green-blind simulation)
- The simulation updates automatically; click Apply to re-render if needed
- Compare the original and simulated images side by side
- Download the simulated image as JPG
Tips for Designers & Accessibility
- Test UI mockups and infographics before launch to ensure color is not the only cue
- Deuteranopia affects roughly 6% of males—test this type for most red-green scenarios
- Pair with our Color Blind Test for personal screening, and Image Color Picker for palette checks
- Simulation is an approximation; individual perception varies with lighting and display calibration