Color Blindness Simulator
Check that your posters, charts and UI are readable by everyone - preview any image through the three common colour-blindness types.
Upload an image to preview how it looks with colour blindness.
How it works
Upload an image (poster, chart or screenshot).
Pick protanopia, deuteranopia or tritanopia.
Compare the simulated view against the original.
Why use this tool?
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The image is processed locally with SVG colour-matrix filters - it never leaves your device.
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Deuteranopia is the most common type, affecting about 1 in 12 men.
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Use it to check charts, maps and UI contrast before you publish.
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The simulation is an approximation of how colours shift, not a medical view.
Frequently asked questions
Which types are included?
The three most common forms: protanopia (red-blind), deuteranopia (green-blind) and tritanopia (blue-blind).
Is my image uploaded?
No - the file is read in your browser and filtered with SVG; nothing is sent to a server.
Can I download the simulated image?
This preview uses a CSS filter for speed. To export, screenshot the simulated panel - a full export is not built in.
How accurate is the simulation?
It uses the standard colour-modelling matrices, which are a good approximation but not a perfect match for any individual’s vision.
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