Free Online Color Blindness Simulator
100% Private & No Signup Required
Simulate various forms of color blindness (Deuteranopia, Protanopia, Tritanopia) on your images. Compare side-by-side or in a grid and download results. 100% local.
Initializing Module
Optimizing assets and preparing high-fidelity workspace...
What is Free Online Color Blindness Simulator?
Over 300 million people worldwide experience some form of color vision deficiency (CVD). Red-green color blindness (Deuteranopia and Protanopia) affects approximately 8% of males and 0.5% of females. Designing website graphics, charts, and product images without verifying color accessibility can leave a large portion of your audience unable to read or navigate your content.
Testing visual accessibility manually can be complicated. Setting up specific filters or loading images in heavy graphic design software slows down design workflows.
SimpleClickLab's Color Blindness Simulator provides a fast, browser-based tool to check your images instantly. Drag and drop any image and see it through 8 different types of color deficiency in real-time.
We use GPU-accelerated SVG color-matrix filters directly in your browser. This means simulations render instantly even for high-resolution images, with zero lag.
Features include a premium side-by-side comparison slider to compare original and simulated versions, a Grid view to inspect all vision types simultaneously, and canvas-based exporting to save simulated versions.
Since all processing is run locally on your device, your images are never sent to external servers, ensuring complete privacy for your design drafts and mockups.
Key Features
- GPU-accelerated SVG matrix filters for instant, real-time vision simulation
- Support for 8 distinct vision types: Deuteranopia, Deuteranomaly, Protanopia, Protanomaly, Tritanopia, Tritanomaly, Achromatopsia, Achromatomaly
- Interactive split-screen comparison slider with drag control for 'Before / After' analysis
- Simultaneous Grid view to view the image in all 8 color-deficient styles at once
- Local rendering to Canvas to allow high-quality downloads of the simulated output files
- 100% private: all operations occur locally in the browser with no image uploads
Common Use Cases
- Web designers checking dashboard charts and graphs to make sure data categories remain distinguishable for colorblind users
- UI/UX developers testing landing page CTA button contrasts and color-based system alerts
- Graphic designers and artists previewing how color schemes and brand logos look to colorblind consumers
- Accessibility auditors checking digital assets against WCAG 2.1 contrast and color standards
- Educators and teachers demonstrating vision differences and color perception anomalies in design classes
Your data never leaves your browser
Color Blindness Simulator helps designers, developers, and creators test image accessibility for color-deficient users. Upload any image (PNG, JPG, WebP) and simulate Deuteranopia, Protanopia, Tritanopia, Achromatopsia, and their anomalies. It includes an interactive split-screen slider for direct comparisons, a multi-vision grid view, and full local download capabilities.
How to use it
Upload Image
Drag and drop your image (PNG, JPG, WebP) onto the upload zone, or click to choose a file.
Select Vision Type
Choose a specific vision type from the control panel, or select the 'Grid View' to inspect all types at once.
Compare and Download
Use the interactive slider to compare, and click 'Download Simulated Image' to export the processed output.
FAQ
?What is the difference between Deuteranopia, Protanopia, and Tritanopia?
Deuteranopia is green-cone blindness (the most common type of red-green deficiency). Protanopia is red-cone blindness. Tritanopia is blue-cone blindness (blue-yellow color blindness, which is much rarer).
?Are my images secure?
Yes. The simulator uses browser-side SVG filters. Your images are loaded into local memory and are never uploaded to any server or shared with third parties.
?How accurate are these simulations?
We use standard mathematical matrices (derived from the widely accepted Brettel, Viénot & Mollon algorithms) to simulate color-cone deficiencies. They are highly accurate for general accessibility reviews, though individual real-world perception can vary.
?Can I download the simulated image?
Yes! Click the 'Download' button and the app will render the SVG filter parameters onto a local HTML canvas element, generating a downloadable PNG copy of the simulation.
?Does this check compliance with accessibility standards (WCAG)?
It provides a visual check of color distinctness. For full WCAG compliance, you should also use our Color Contrast Checker to verify specific color contrast ratios for text.
Need a custom tool?
We're constantly adding new tools. Suggest one or report a bug.
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