Accurate Color Blindness Simulator
Machado 2009 colour / color blind simulator · upload image or URL · 4 CVD types · WCAG contrast check
Upload a design or enter a URL
See how your work looks to people with deuteranopia, protanopia, tritanopia, or achromatopsia. Nothing is sent to a server all processing is done in your browser.
Drop your image here, or click to browse
PNG · JPG · GIF · WebP · SVG up to 10 MB
Pro Tips
- Use high-resolution images (800px+) for clearer results
- Focus on UI elements that rely on color to convey information
- Charts, status indicators, and CTAs are the highest-risk areas
- 8% of men and 0.5% of women have some form of CVD
Color Blindness Simulator for Images & Websites
Upload PNG, JPG, SVG, or GIF—or enter a live URL—to preview designs under protanopia, deuteranopia, tritanopia, and achromatopsia. Transforms follow Machado, Oliveira & Fernandes (2009), documented on our methodology page.
Method: Machado 2009 simulation methodology. Also try: free color blind test, WCAG contrast checker, Figma color blind plugin.
FAQ
Can I upload an image to the color blind simulator?
Yes. Upload JPG, PNG, GIF, or SVG—or paste a website URL to simulate color blindness on a live page.
Is this an accurate color blindness simulator?
Yes for screening and design review. We use Machado, Oliveira & Fernandes (2009) matrices—the same family of transforms used in professional tools—not the older Coblis ColorMatrix shortcuts.
Does the simulator upload my files?
No. Image processing runs in your browser. We do not require an account.
Which CVD types can I simulate?
Protanopia, deuteranopia, tritanopia, and achromatopsia, with a severity slider for partial (anomaly) previews.