Color blindness simulator: test your images and colors
Simulate how an image looks for different color blindness types (protanopia, deuteranopia, tritanopia, achromatopsia).
Load an image to compare the original and the simulated version.
Approximate simulation for accessibility checks. The image is processed locally, nothing is sent.
🔒 100% client-side — no data sent
Check the accessibility of your visuals by simulating how they look for the main color blindness types: protanopia, deuteranopia, tritanopia and achromatopsia. Load an image and compare the original with the simulated version, side by side. Processing is 100% local.
What is it for?
- ▸ Check a chart stays readable for color-blind users
- ▸ Test a palette or brand colors before publishing
- ▸ Verify colored buttons and alerts
- ▸ Raise awareness of visual accessibility
FAQ
Which color blindness types are simulated?
Protanopia (red), deuteranopia (green), tritanopia (blue) and achromatopsia (no color).
Is the simulation accurate?
It is an approximation based on standard matrices, useful to check legibility, not a medical diagnosis.
Which image formats can I load?
Any format the browser can display: PNG, JPEG, WebP, GIF, SVG… Large images are downscaled to stay smooth.
Is my image uploaded online?
No, all processing happens in your browser; the image never leaves your device.