Color-Blindness Simulator

Preview how an image or UI looks with protanopia, deuteranopia, tritanopia & more — check a11y locally.

Preview how an image or UI looks with protanopia, deuteranopia, tritanopia & more — check a11y locally. Free and 100% private — runs entirely in your browser, nothing is ever uploaded.

About Color-Blindness Simulator

Color-Blindness Simulator is a free, browser-based design tool that lets you preview how an image or UI looks with protanopia, deuteranopia, tritanopia & more — check a11y locally. Because it runs entirely on your device, there’s nothing to install, no account to create, and your data is never uploaded to a server.

How to use Color-Blindness Simulator

  1. Open Color-Blindness Simulator — it loads in any modern browser, with no sign-up.
  2. Drop an image, or click to choose one from your device.
  3. Get the result instantly, processed locally on your device.
  4. Copy or download the output — what you entered is never sent anywhere.

Frequently asked questions

Is Color-Blindness Simulator free?
Yes — Color-Blindness Simulator is completely free, with no account, sign-up or usage limits.
Is my data private?
Yes. Color-Blindness Simulator runs 100% in your browser, so your files and text are processed on your own device and never uploaded.
Do I need to install anything?
No — Color-Blindness Simulator works in any modern desktop or mobile browser with nothing to download.