Color Blindness Simulator
100% Client-Side PrivacyFree color blindness simulator — see how your images and colors appear to people with protanopia, deuteranopia, tritanopia and more.
Quick Features
- 7 simulations: 3 anopia + 3 anomaly + achromatopsia
- Upload any image, or use the built-in test pattern
- Side-by-side grid of all variants
- Download any simulated image as PNG
- Simulate single colors for quick checks
- 100% client-side — images never upload
How to use Color Blindness Simulator
Add an image
Upload any image or keep the built-in color test pattern.
View the simulations
See the image as someone with each type of color vision deficiency sees it.
Check a single color
Simulate any hex value and inspect the resulting colors.
Why choose this tool
- Completely free — no signup or hidden limits
- Runs 100% in your browser — your data stays private
- Instant results, no downloads or installs
- Works on any device with a modern browser
Common Use Cases
- Check data-viz charts for color-blind readability
- Verify alert and status colors still distinguish
- Design accessible brand palettes
- Understand what color-blind users actually see
Technical Details
Frequently Asked Questions
What is color blindness?
Color vision deficiency (CVD) affects the cone cells in the eye. Red-green (protan/deutan) is most common, affecting about 1 in 12 men and 1 in 200 women.
Are the simulations accurate?
They use the standard Brettel–Viénot–Mollon and linear matrix models used in accessibility research. Real experiences vary, but they're a strong approximation.
Is my image uploaded?
No. All simulation runs entirely in your browser on a canvas — nothing is ever uploaded.
How do I make designs color-blind safe?
Never rely on color alone — combine with icons, patterns or labels, and verify contrast separately for each state.
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