Color Blind Simulator

Upload any image and preview how it looks to people with deuteranopia (red-green, most common), protanopia (red-blind), tritanopia (blue-yellow), and achromatopsia (full colour blindness). Useful for checking design accessibility.

100% freeNo sign-upRuns in your browserNo upload · data stays private
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Colour blindness types simulated

Normal vision — original image.
Deuteranopia — reduced green sensitivity (most common, ~6% of males).
Protanopia — reduced red sensitivity (~2% of males).
Tritanopia — reduced blue sensitivity (rare, ~0.01%).
Achromatopsia — no colour perception (very rare; full greyscale).

How to use this tool

  1. Upload an image.
  2. All five simulations render side-by-side instantly.
  3. Right-click any simulation image to save it.

Why it's private

All simulation uses pixel-level colour matrix transforms on an HTML Canvas. Your image never leaves your browser.