Color Blindness Simulator
Preview images through color vision deficiency filters
Loading Color Blindness Simulator...
⚙️ How It Works
Upload an image, choose a simulation mode, and the preview updates instantly to reflect how it appears under that condition.
❓ Frequently Asked Questions
What conditions can I simulate?
Common color vision deficiencies including Protanopia (red-blind), Deuteranopia (green-blind), and Tritanopia (blue-blind).
Why should I use this?
To identify contrast issues and avoid relying on color alone, improving accessibility for a wider audience.
How accurate are the simulations?
They use standard color transformation matrices to approximate perception. Useful for design validation, not medical diagnosis.
Are my images uploaded anywhere?
No. Processing happens entirely in your browser. Files never leave your device.
How common is color blindness?
Roughly 8% of males and 0.5% of females of Northern European descent are affected, most commonly with red or green deficiencies.
What's the best way to design for accessibility?
Ensure sufficient contrast, avoid color-only meaning, and pair colors with labels, patterns, or icons.
Does the Color Blindness Simulator work offline?
Yes, the Color Blindness Simulator is fully functional offline. Because this tool runs entirely in your browser, no data is ever uploaded to external servers. Once the page is loaded, you can seamlessly continue using it without an active internet connection. You can also install Knicknaks as a Progressive Web App (PWA) for native-like offline access.