Workspace Files stay on your device
images · accessibility
Colour-Blindness Simulator
Simulates protanopia, deuteranopia or tritanopia with a fixed 3×3 colour matrix (Machado et al., 2009 severity 1.0) applied to every pixel — a deterministic preview of how the image reads without red, green or blue cones. Lossless PNG out.
A little guidance. A better result.
How to use Colour-Blindness Simulator
Protanopia, deuteranopia or tritanopia via a fixed Machado 2009 matrix — deterministic preview.
Prepare your input
Open the image to inspect.
Use the workspace
Choose a simulated colour-vision mode.
Check your result
Compare labels, shapes and contrast across the previews.
Know the limits
A fixed colour matrix is an approximation, not a diagnosis or a complete accessibility assessment.
Where does my input go?
This browser tool processes your input on your device. Optional analytics is a separate choice; it is not needed to use the tool. Keep your original until you have checked the result.
Read the privacy details →Made for the work in front of you.Report a problem ↗