Color Blindness Simulator - Online Color Blindness Simulator
Simulates the way color blind people see images
Select color blindness type
Click to upload image
Color Blindness Simulator Online - Free color blindness simulation tool for Designers
Tan Phat Digital's free online color blindness simulation tool is an indispensable tool for UI/UX designers, web developers, and product teams who want to create accessible products for all users. With approximately 300 million people worldwide suffering from some form of color blindness (8% of men, 0.5% of women), testing designs with a color blindness simulator is no longer optional but mandatory to comply with WCAG 2.1 accessibility guidelines. The tool supports simulating the 4 most common types of color blindness: Protanopia (red blindness), Deuteranopia (green blindness), Tritanopia (blue blindness), and Achromatopsia (complete/grayscale color blindness). Upload an image of your design, select color blindness, and instantly see how color blind users see your product. All processing takes place offline in the browser using the Canvas API, ensuring absolute security for unpublished designs.
Outstanding features
Simulates the 4 most common types of color blindness with high accuracy based on scientific research
Protanopia - Red color blindness: affects about 1% of men, difficulty distinguishing between red and green
Deuteranopia - Green color blindness: most common, about 1% of men, confuses green and red
Tritanopia - Blue color blindness: rare, difficulty distinguishing between blue and yellow
Achromatopsia - Complete color blindness: only sees grayscale, very rare (1/30,000 people)
Compare the original image and the simulated image side by side to easily evaluate
100% offline processing on the browser using Canvas API, no uploading images to the server
Download the processed image (PNG) to share with the team or include in the documentation
Supports all popular image formats: JPG, PNG, WebP, GIF, BMP
Simple interface, drag & drop or click to upload
Why is color blindness testing mandatory in modern design?
Accessibility is not only an ethical but also a legal requirement in many countries. WCAG 2.1 (Web Content Accessibility Guidelines) requires that information not be conveyed solely through color. If your design uses red for errors and green for success without other indicators, 8% of men will not be able to tell the difference. This affects: forms validation (unknown which fields are errors), data visualization (unreadable charts and graphs), navigation (unclear active states), and call-to-action buttons (not prominent). Testing with the color blindness simulator helps you detect problems early, save on repair costs later, and ensure the product is accessible to all users.
Benefits when used
•Ensuring accessible design for 300+ million color blind people in the world
•Compliant with WCAG 2.1 Level AA - legal requirement in many countries
•Avoid lawsuits about accessibility - increasingly common in the US and EU
•Increase user base - without losing 8% of male potential users
•Improve UX for all users, not just color blind
•Detect problems early in the design process, saving repair costs
•Create documentation for accessibility audit and compliance reports
•Educate team about inclusive design practices
Detailed instructions on how to use Color Blindness Simulator
1Click on the upload area or drag & drop your design image (UI mockup, screenshot, chart, etc.)
2Select the type of color blindness you want to simulate from 4 options: Protanopia, Deuteranopia, Tritanopia, Achromatopsia
3Click the
4button to process images with color transformation matrix
5Compare the original image (left) and the simulated image (right) to evaluate
6Check: are the elements distinguishable? Is the text readable? Do CTAs stand out?
7Experiment with different types of color blindness - each type has its own characteristics
8Click
9to save simulation images, share with team or include in accessibility report
10If you find problems, go back to design and add non-color indicators (icons, patterns, labels)
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