Art tools
Color blindness simulator
Load an image to see how it looks with different types of color blindness. The picture never leaves your browser.
No image loaded yet. Pick one above to start.
How it works
Load an image and see it the way people with color vision deficiencies do. The simulator renders your picture through four filters side by side with the original: protanopia and deuteranopia (the common red-green types), tritanopia (blue-yellow), and achromatopsia (total color blindness). Each is produced by transforming the pixels of your image on a canvas, so you can spot where a design relies on color alone.
It is a quick accessibility check for charts, maps, UI states, and artwork: if a red "error" and a green "success" become indistinguishable under deuteranopia, you know to add a shape, label, or pattern. Because the transform runs on your device, the image is never uploaded and the tool works offline.
Example. Upload a red-and-green status chart. Under the deuteranopia view the two series collapse to similar muddy tones - a clear sign to differentiate them with labels or textures rather than color.
FAQ
Which types of color blindness can it simulate?
Protanopia and deuteranopia (red-green deficiencies), tritanopia (a blue-yellow deficiency), and achromatopsia (seeing no color at all). They cover the most common and the most severe cases.
How accurate is the simulation?
It uses established color-transform matrices to approximate how each deficiency shifts colors. It is a reliable guide for design decisions, not a medical diagnosis, and real perception varies from person to person.
Why should I check my designs for color blindness?
Around one in twelve men and one in two hundred women have some color vision deficiency. If meaning is carried by color alone, those users can miss it; the simulator shows where to add a second cue such as text, shape, or pattern.
Is my image uploaded?
No. The picture is processed pixel by pixel in your browser on a canvas. Nothing is sent to a server, so it works offline and your images stay private.