Color Blindness Simulator

See how your images appear to people with color vision deficiency. Upload an image and instantly view simulations for protanopia, deuteranopia, and tritanopia. Side-by-side comparison with download. 100% private, no upload to server.

100% Free No Sign Up Privacy First No Upload
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Upload an Image

Click or drag & drop an image here (JPG, PNG, WebP)

Normal Vision
Protanopia (Red-Blind)
Deuteranopia (Green-Blind)
Tritanopia (Blue-Blind)

How to Use Color Blindness Simulator in 3 Steps

1

Upload an Image

Click the upload area or drag and drop an image file. Supports JPG, PNG, and WebP formats. All processing stays on your device.

2

Compare Simulations

View the normal image alongside three color blindness simulations: protanopia (red-blind), deuteranopia (green-blind), and tritanopia (blue-blind).

3

Download & Share

Download the combined comparison grid as a single image to share with your team or use in accessibility reports.

Why Choose HueGrad Color Blindness Simulator?

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Privacy First

All image processing happens locally in your browser using Canvas API. Your images never leave your device.

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Lightning Fast

Simulations are rendered instantly using optimized color matrix transforms. No waiting for server-side processing.

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100% Free

No hidden fees, no subscriptions, no credit card required. Simulate unlimited images without any cost.

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Unlimited Usage

No limits on the number of images or simulations. Use as much as you need for all your accessibility testing.

Frequently Asked Questions

A color blindness simulator is a tool that transforms images using color matrices to simulate how people with different types of color vision deficiency perceive colors. It helps designers and developers create more accessible content.
HueGrad simulates three common types of color blindness: protanopia (red-blind, difficulty perceiving red light), deuteranopia (green-blind, difficulty perceiving green light), and tritanopia (blue-blind, difficulty perceiving blue light).
The simulation uses standard color transformation matrices based on the Brettel-Vienot-Mollon model, which is widely accepted in accessibility research. While it provides a close approximation, individual experiences of color blindness may vary.
Yes, HueGrad is completely free to use. There are no hidden fees, no subscription required, and no sign-up needed. All image processing happens locally in your browser.
No. All image processing in HueGrad happens entirely in your local browser using the HTML5 Canvas API. Your images never leave your device. We prioritize your privacy with 100% client-side processing.