Color Blindness Simulator — Free Online Tool
Upload any image and see how it appears to people with different types of color blindness: protanopia (no red), deuteranopia (no green), tritanopia (no blue), and achromatopsia (no color). Uses Daltonize simulation matrices applied via Canvas API. All four simulations appear side by side for easy comparison.
100% client-side. No uploads. Your data never leaves your browser.
How to use Color Blindness Simulator
- Upload an image.
- Four simulations appear side by side.
- Compare each type to identify potential accessibility issues.
- Download any simulation for use in presentations or reports.
Frequently Asked Questions
What is protanopia vs deuteranopia?
Protanopia affects red perception; deuteranopia affects green perception. Both are red-green color blindness variants and together affect ~8% of males.
How accurate is this simulation?
The simulation uses Daltonize matrices which approximate color blindness perception. It is a useful design tool but not a perfect medical simulation.
Why should I test my designs for color blindness?
About 8% of males have some form of color blindness. Designs relying on color alone to convey information may be inaccessible to these users.
Related tools
Related reading
Browse all free tools · theproductguy.in