Color Blindness Simulator
Simulate how images and colors appear under different color vision deficiencies.
The Color Blindness Simulator shows how an image or colour appears under common vision deficiencies. It is a practical check for designers who want their work to stay legible for more people.
Original
Deuteranopia
What is a Color Blindness Simulator?
A color blindness simulator is a digital tool that demonstrates how images, designs and colors appear to individuals with various types of color vision deficiencies. These deficiencies occur when one or more of the cone cells in the retina do not function properly, affecting color perception. Common types include deuteranopia where green-sensitive cones are impaired, protanopia where red-sensitive cones are affected, tritanopia affecting blue-sensitive cones and achromatopsia which results in complete color blindness appearing as grayscale vision. Designers and developers use these simulators to test their visual materials for accessibility and ensure content remains comprehensible to users with color vision deficiencies.
The simulator works by applying mathematical transformation matrices to each pixel's RGB values, approximating how the human visual system would perceive colors under different cone cell deficiencies. This simulation helps identify potential accessibility issues early in the design process, preventing problems that might exclude users with color vision deficiencies from fully understanding visual information. By testing interfaces, charts and graphics through these simulators, creators can make informed decisions about color choices, contrast levels and alternative visual cues such as patterns or labels that maintain information clarity regardless of color perception.
This particular color blindness simulator runs entirely within your browser using client-side JavaScript, ensuring complete privacy since no images are ever uploaded to any server. You can upload your own test images or simply pick a solid color to see how it appears under each deficiency type. The tool provides side-by-side comparison of the original and simulated versions, making it easy to spot potential accessibility issues. For web designers, graphic artists, and developers alike, this tool helps ensure your visual content remains accessible to the widest possible audience, which is both sound design practice and an important legal requirement in many jurisdictions today.
How to use this Color Blindness Simulator
- Upload an image file using the file input or skip this step to work with solid colors.
- Select either Image mode or Color swatch mode depending on your testing needs.
- Pick a deficiency type from the dropdown menu: deuteranopia, protanopia, tritanopia or achromatopsia.
- For color swatch mode, use the color picker to choose the color you want to simulate.
- Compare the original image or color with the simulated version to identify potential accessibility issues.
- Adjust your design colors or add additional visual cues to improve accessibility based on what you observe.
FAQ
What is a color blindness simulator?
A color blindness simulator shows how images or colors appear to people with different types of color vision deficiencies such as deuteranopia, protanopia, tritanopia and achromatopsia using standard RGB transformation matrices.
How does the color blindness simulator work?
The simulator loads your image entirely in your browser using FileReader or creates a solid color swatch. It applies transformation matrices to each pixel to simulate the selected color vision deficiency without ever uploading the image anywhere.
Does the color blindness simulator store or upload my images?
No, the color blindness simulator processes images entirely in your browser using client-side JavaScript. Images are never uploaded to any server and no data is stored or collected.
What color deficiencies does it simulate?
The simulator simulates deuteranopia (green-blind), protanopia (red-blind), tritanopia (blue-blind) and achromatopsia (complete color blindness resulting in grayscale).