This is an approximation, for information only.
It shows how colours may look with each kind of colour blindness. It is not a test or a diagnosis.
Colour Blindness Simulator
See how an image looks with colour blindness.
Drop an image hereAdd your image
JPG, PNG, WebP or AVIF, up to 50 MBor paste with Ctrl+V
Your files stay on your deviceHow?
How to simulate colour blindness
- Choose a JPG, PNG, WebP or AVIF image.
- Press Simulate colour blindness.
- Compare the four versions with your image, then download one or all of them.
Questions
Is my image uploaded anywhere?
No. The versions are made inside your browser, and your image never leaves your device.
How accurate is it?
It is an approximation, for information only. It uses a published model of how each kind of colour blindness changes colours, at its strongest. People see colours differently, and it is not a test or a diagnosis.
What do the four versions show?
Protanopia and deuteranopia are the two kinds of red–green colour blindness, without working red or green cones. Tritanopia is blue–yellow colour blindness. Achromatopsia is seeing no colour at all, only light and dark.
How can I use this for my designs?
Check that charts, maps and buttons can still be told apart in every version. Where they can't, add labels, patterns or a stronger difference in lightness, not only colour.
What size are the versions?
The same size as your image. Each one downloads as a PNG, and all four together as a ZIP.