Color Blindness Simulator
Simulate protanopia, deuteranopia, or tritanopia with an approximate matrix transform on an uploaded image.
What this tool does
Simulate protanopia, deuteranopia, or tritanopia with an approximate matrix transform on an uploaded image.
Where this tool is useful
Preview how color pairs may be less distinguishable; simulation is indicative, not a clinical test.
Example or format details
Try a chart with red and green categories and compare the original with the simulated output.
How to use Color Blindness Simulator
- 1
Select an image from your device or enter the requested color values, then run the calculation.
- 2
Adjust the fields and options, then select Run tool.
- 3
Inspect the actual result. Copy the text or download the generated file when appropriate.
Privacy and processing
Entered content and chosen files are processed locally in your browser. No conversion request is sent to a freedropper server.
Common questions
What can I use this for?
Preview how color pairs may be less distinguishable; simulation is indicative, not a clinical test.
What does the tool accept?
Select an image from your device or enter the requested color values, then run the calculation.
What should I check before using the output?
The output applies an approximate matrix, not a clinical simulation of an individual observer. Contrast and text labels still need independent accessibility testing.
Does my input leave my device?
The utility runs in your browser. Selected content is not transmitted to a freedropper conversion service.
How can I reuse the result?
Copy the output or use the download control when the tool produces a file. Check the target application accepts the resulting syntax or file type.