Color blindness simulator
Upload a photo and see it with deuteranopia, protanopia, tritanopia or achromatopsia, then correct it or highlight one color.
See it as
Tools for color blind eyes
Tap the original photo to pick the color to find.
- reddiagonal stripes
- orangeback stripes
- yellowvertical lines
- greendots
- bluehorizontal lines
- purplegrid
- pinkrings
- brownchecks
JPG, PNG, WebP, AVIF or HEIC. The photo never leaves this device.
Simulation uses the Machado, Oliveira and Fernandes (2009) matrices at full severity, applied in linear RGB, the same as the ColorID app. Your photo stays on this device.
How to use it
- Choose a photo or drop it on the page.
- Pick a type under See it as: deuteranopia, protanopia, tritanopia or achromatopsia.
- Drag the round handle, or use the arrow keys, to compare the original with the result.
- Try the tools for color blind eyes: Correct, Highlight one color, Find a color and Patterns.
Questions
How accurate is the simulation?
It uses the Machado, Oliveira and Fernandes (2009) model at full strength, in linear RGB, the model most research and design tools use. Milder types sit between the result and the original.
What does Correct do?
It shifts the colors a color blind eye confuses toward ones it can tell apart, a method called daltonization. It helps tell colors apart; it does not restore normal color vision.
Is the photo uploaded?
No. Everything runs in your browser.