What is color blindness?

Color blindness (color vision deficiency) is a condition where people have difficulty distinguishing certain colors. The most common types are Protanopia (red-green), Deuteranopia (red-green), and Tritanopia (blue-yellow).

Why should I test images for color blindness?

Testing images for color blindness ensures your designs are accessible to all users. Approximately 8% of men and 0.5% of women have some form of color vision deficiency. Accessible designs improve user experience for everyone.

What types of color blindness can I simulate?

Three types: Protanopia (red-green color blindness, difficulty seeing red), Deuteranopia (red-green color blindness, difficulty seeing green), and Tritanopia (blue-yellow color blindness, difficulty seeing blue).

How do I use the color blindness simulator?

Upload your image, select a color blindness type (Protanopia, Deuteranopia, or Tritanopia), and see how the image appears to people with that type of color vision deficiency. Compare with the normal view.

What should I look for when testing?

Check if important information relies solely on color. Ensure text is readable, buttons are distinguishable, and information is conveyed through shapes, patterns, or text labels in addition to color.

Is the color blindness simulator free?

Yes, completely free! No registration, no limits, no hidden fees. All image processing happens in your browser - we never see or store your images.

👁️ Color Blindness Simulator

Simulate color blindness to test image accessibility. Preview how images look with different types of color vision deficiency.

Color Blindness Type

Normal color vision

Upload Image

Click to upload or drag and drop

image/*

Max size: 10.00 MB

About Color Blindness

Protanopia: Red-green color blindness where red cones are missing. Affects ~1% of males.

Deuteranopia: Red-green color blindness where green cones are missing. Affects ~1% of males.

Tritanopia: Blue-yellow color blindness where blue cones are missing. Very rare, affects ~0.01% of population.

Use this tool to test your designs for accessibility and ensure information is conveyed through more than just color.

How to Simulate Color Blindness

Upload a screenshot, UI mockup, or illustration that you want to test.
Select the color vision deficiency: Protanopia, Deuteranopia, or Tritanopia.
Review the preview canvas to see how users with each condition perceive your design.
Download the processed preview to share with teammates or attach to QA reports.

Tip: Test critical flows (forms, buttons, alerts) to ensure color alone isn’t conveying important information.

Color Blindness Types Explained

Protanopia

Red cones missing. Reds look darker and blend with greens. Affects ~1% of males.

Deuteranopia

Green cones missing. Greens fade toward beige. Also affects ~1% of males.

Tritanopia

Blue cones missing. Blues and yellows shift dramatically. Rare (<0.01% population).

Accessibility Best Practices

Use redundant cues: combine color with icons, labels, or patterns.
Maintain sufficient contrast (WCAG AA) so text remains legible for most users.
Avoid pairing problematic colors (red/green, blue/yellow) for status indicators.
Document findings and share the simulated previews during design critiques.