Color Blindness Simulator
FreePreview colors as seen by users with protanopia, deuteranopia, and tritanopia
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How it works
1
Input
Enter a color or upload an image you want to test for colorblind accessibility.
2
Simulate
The tool applies color vision deficiency filters to show how the color appears under each type of color blindness.
3
Compare
Review the simulated results side by side to identify colors that may be indistinguishable for colorblind users.
Frequently asked questions
What types of color blindness does it simulate?+
It covers protanopia, deuteranopia, and tritanopia (the three main types), plus protanomaly, deuteranomaly, tritanomaly, achromatopsia, and achromatomaly.
Is this tool accurate for real-world accessibility testing?+
The simulation uses established color matrix transformations based on published research. It provides a reliable approximation of how colors appear to people with each condition.
Are images processed on a server?+
No. All simulation processing happens locally in your browser using canvas pixel manipulation. Your images and colors never leave your device.
How common is color blindness?+
Approximately 8% of men and 0.5% of women have some form of color vision deficiency. Red-green color blindness (deuteranomaly) is the most prevalent type.
How can I make my design colorblind-friendly?+
Avoid relying on color alone to convey information. Use patterns, labels, or icons alongside color. Test your palette here to ensure sufficient contrast between key elements.