Upload an image and preview it as someone with a color vision deficiency might see it. Compare original vs. simulated side-by-side with a drag slider — useful for checking that your designs remain accessible.
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Upload an image and preview it as someone with a color vision deficiency might see it. Compare original vs. simulated side-by-side with a drag slider — useful for checking that your designs remain accessible.
Whether you're a professional or just need a quick result, the Color Blindness Simulator gives you a fast, reliable image tool that works instantly in your browser. There's no software to install and nothing to sign up for — open the page, get your result and move on. Because everything runs on your own device, it's private by default and available whenever you need it.
The Color Blindness Simulator is part of TechToolsCenter — a free, privacy-first collection of 118+ online tools. Everything runs 100% in your browser, so your data stays private and results are instant.
Input
Output
Formats
Add an image from your device. It's processed locally using your browser's canvas — never uploaded.
Crop, resize, convert or adjust with the controls. The preview updates in real time.
Inspect the result at full quality and fine-tune the settings until you're happy.
Export the finished image in your chosen format. No watermarks, no limits, fully private.
Tips
Common mistakes
Best practices
Input
Image upload — e.g. color blindness simulator
Output
Image download, generated instantly in your browser
It uses well-established approximation matrices common to open-source color-blindness simulators — a useful design/accessibility check, but not a clinically precise model of any individual's vision.
It's free, private and works instantly — no sign-up required.
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