Free Colorblind Simulator Online
Simulate how colors and images appear to people with color vision deficiency using our free online Colorblind Simulator. Test your designs for accessibility by viewing them through 7 types of color blindness — Protanopia, Deuteranopia, Tritanopia, Protanomaly, Deuteranomaly, Tritanomaly, and Achromatopsia. Upload any image and see a side-by-side comparison of the original and simulated versions. The tool also includes color test swatches showing how common colors transform under each simulation type. Based on research by Brettel, Vienot & Mollon. Essential for designers ensuring accessible color choices.
How to Use Colorblind Simulator
Select Simulation Type
Choose from 7 color blindness types to simulate: Protanopia, Deuteranopia, Tritanopia, and more.
Upload Image
Upload an image to see how it appears to people with the selected color vision deficiency.
Compare & Download
Compare original and simulated images side by side. Download the simulated version.
Features
7 Simulation Types
Simulates Protanopia, Deuteranopia, Tritanopia, Protanomaly, Deuteranomaly, Tritanomaly, and Achromatopsia.
Side-by-Side View
Compare original and simulated images side by side for clear visualization.
Color Swatches
See how standard colors (red, green, blue, etc.) transform under each simulation.
Research-Based
Uses color transformation matrices based on Brettel, Vienot & Mollon (1997) research.
Benefits of Using Colorblind Simulator
Completely Free
Use Colorblind Simulator without any cost, limits, or hidden fees. No premium plans needed.
No Installation
Works directly in your browser. No software downloads or plugins required.
100% Private
Your files and data are processed locally. Nothing is uploaded to external servers.
Works Everywhere
Compatible with Chrome, Firefox, Safari, Edge on desktop, tablet, and mobile.
No Sign-Up
Start using the tool immediately. No account creation or email verification.
Always Available
Access this tool 24/7 from anywhere in the world, on any device.
Frequently Asked Questions
Complete Your Design Tools Workflow
These free tools work seamlessly with Colorblind Simulator to handle every step of your workflow.