Image · Processed locally

Colour-Blindness Simulator

Explore protanopia, deuteranopia, tritanopia and grayscale approximations. Compare and download simulated images locally.

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Local processingNo account needed

Or drop a file here. JPG, PNG or static WebP · up to 25 MB / 24 MP.

Choose an image once, then explore all four approximations. Exports use a maximum 4 MP working copy.

Approximation of missing L-cone function: changes in red/green discrimination.

These are approximations, not a medical assessment or a guarantee of individual perception. Check labels, contrast and non-colour cues separately.

Choose a file to begin.

Files stay in this browser’s memory. Originals are unchanged. Clear files or leave this page to release the studio’s copies.

How to use Colour-Blindness Simulator

  1. Choose an image or Try a colour sample. The tool generates the four supported simulations locally.
  2. Choose Simulation to switch the comparison view, or enable Compare every simulation to see the set together.
  3. Download the simulated image you need. These are approximations, not a diagnosis or proof of accessibility; also check contrast, labels and cues that do not depend on colour.

File names, contents and generated text are not sent to analytics. These utilities are not a content or privacy audit. Review your output before using it.