Color Blindness Simulator

Protanopia, deuteranopia, tritanopia, achromatopsia, and their partial variants (protanomaly, deuteranomaly, tritanomaly).

Yes, upload an image and it will be fully transformed to show how it appears under the selected color vision type.

Treat color as a secondary cue and make sure the information also arrives another way. In a chart, vary the line style (solid, dashed) or marker shape and place the series name right next to the line. In a form, never rely on a red border alone — pair it with an error message and an icon — and keep links underlined instead of signalling them by color only.

Red-green color deficiency affects roughly 8% of men and 0.5% of women — close to 300 million people worldwide. Even a modest site with a hundred visitors will have several men among them who see it differently. And a screen that relies on color alone also fails in black-and-white printouts and on a dim display in bright sun, so this consideration ends up helping everyone.