Color Blindness Simulator
Free online color blindness simulator. Upload any image to instantly see how it appears to people with Deuteranopia, Protanopia, Tritanopia, or Achromatopsia. Test your UI designs, color palettes, and images for accessibility.
Color Tester
About Color Blindness Simulator
Our Color Blindness Simulator helps designers, developers, and content creators ensure their work is accessible to people with color vision deficiencies. Using scientifically accurate color transformation matrices based on research by Machado et al. (2009), the simulator applies real-time filters to show how images appear to individuals with different types of color blindness. All processing happens entirely in your browser — no data is uploaded to any server.
Features
- Simulate 4 types of color blindness instantly
- Side-by-side original vs simulated comparison
- Upload any PNG, JPEG, or WebP image
- Download simulated images for sharing
- Built-in hex color tester
- 100% client-side — complete privacy
Frequently Asked Questions
How accurate is the color blindness simulation?
Our simulator uses color transformation matrices based on peer-reviewed research (Machado et al., 2009) that models how different types of color blindness affect human vision. While individual experiences vary, the simulation provides a scientifically grounded approximation.
What types of color blindness are supported?
We support Deuteranopia (green deficiency, ~5% of males), Protanopia (red deficiency, ~1% of males), Tritanopia (blue deficiency, ~0.01%), and Achromatopsia (complete color blindness, ~0.003%).
Is my image data safe?
Absolutely. All image processing happens entirely in your browser using JavaScript and Canvas. Your images are never uploaded to or stored on our servers.
Can I use this for web accessibility testing?
Yes! This tool is perfect for testing UI designs, color palettes, charts, and images for color blind accessibility. For WCAG compliance, we recommend also using our Color Contrast Checker tool.