Color Blindness Simulator
Vision type
Original
#3b82f6
→
Simulated
#5e58dc
Palette preview
Each pair: original (left), simulated (right).
Gradient preview
Color Blindness Simulator — Free Online Tool
Simulates how colors appear to viewers with deuteranopia, protanopia, tritanopia, and achromatopsia by applying dichromacy approximation matrices to a color or gradient, with side-by-side before/after preview — useful for accessibility audits, choosing colorblind-safe palettes, and verifying WCAG contrast across vision types.
How to use the Color Blindness Simulator
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
Is the Color Blindness Simulator free to use?
Yes. The Color Blindness Simulator is completely free, with no signup, no ads inside the tool, and no hidden limits.
Does the Color Blindness Simulator upload my data?
No. The Color Blindness Simulator processes everything locally in your browser. Your input is never sent to a server, so it stays private even on shared devices.
Does the Color Blindness Simulator work offline?
After the page loads, the Color Blindness Simulator runs entirely in your browser, so it keeps working without a network connection.
Free & private — why use this Color Blindness Simulator
The Color Blindness Simulator runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.