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Color Blindness Simulator

Upload any image and see how it looks to people with color vision deficiency. Test your UI, charts, and designs for accessibility. Simulation runs entirely in your browser — no uploads, no server.

Generator Tools Runs locally No data sent
accessibility color vision wcag design client-side only
Image
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Drop image here or click to upload
PNG, JPG, GIF, WebP — up to 10 MB
Vision Type
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Upload an image to simulate color blindness
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Simulation uses LMS-based color transformation matrices (Brettel method). About 8% of males and 0.5% of females have some form of color vision deficiency. Use the Contrast Checker to ensure text meets WCAG AA/AAA standards.

What is Color Blindness Simulator?

Simulate how images appear to people with color vision deficiency. Test protanopia, deuteranopia, tritanopia, and achromatopsia. Free, browser-based, no data sent.

How to Use Color Blindness Simulator

  1. Upload the image or screen design you want to check.
  2. Switch between the different color-vision deficiency modes.
  3. Compare how key UI elements, charts, or labels change under each mode.
  4. Adjust your design colors if important meaning is lost in the preview.

Related Tools

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WCAG Contrast Checker
Check WCAG AA and AAA color contrast ratios for accessibility
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Color Picker
Convert colors between HEX, RGB, HSL, and CMYK
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Color Palette Generator
Generate complementary, analogous and triadic color palettes
Understand Color Blindness Modes ▾
Example
Input Upload a chart that uses red and green series colors
Output Preview protanopia, deuteranopia, and tritanopia variants to check whether the series stay distinguishable
Common Use Cases
  • Review charts that rely on red-versus-green status colors
  • Test whether UI states stay distinguishable without color labels
  • Spot risky palettes before publishing infographics
  • Check accessibility of screenshots and marketing assets
Frequently Asked Questions
Should I rely on color alone to convey information?

No —WCAG 1.4.1 requires that color is not the only means of conveying information. Always pair color with icons, patterns, or text labels.

How accurate is the simulation?

The simulation uses established color matrix transformations. It is an approximation —individual perception varies.

What does Color Blindness Simulator Online —Test UI Accessibility Free do?

Color Blindness Simulator Online —Test UI Accessibility Free runs entirely in your browser and helps you complete this task without uploading data to a server.

Is Color Blindness Simulator Online —Test UI Accessibility Free free to use?

Yes. This tool is free to use and does not require sign-up.