Color Blindness Simulator
Upload an image to preview how it looks with common types of color vision deficiency. Everything runs in your browser — your image never leaves your device.
JPG, PNG, GIF or WebP. Max 10 MB. Processed locally only.
Preview
Original
Simulated
Reference color swatches
How common colors appear under the selected simulation (original on top row, simulated below):
How to use
- Upload an image (for example a design, chart or poster you want to check for accessibility).
- Choose the type of color blindness to simulate.
- Drag the severity slider to preview mild or complete deficiency.
- Compare the original and simulated previews side by side.
- Use the reference swatches to spot colors that disappear or become identical.
- Download the simulated image to keep or share with your team.
Note: this is a widely used mathematical approximation of color vision deficiency for design and accessibility checks. It is not a medical test — consult an eye specialist for any vision concern. Red-green types (protanopia and deuteranopia) are the most common; blue-yellow and total color blindness are rare.