Color Blindness Simulator

Name: Color Blindness Simulator
Author: Tools Ayoob

Upload an image or try the sample. Choose a simulation to preview how people with color vision deficiency see colors.

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Tip: Use this tool to check color contrast and accessibility of charts, icons and images before publishing.

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About This Tool

This Color Blindness Simulator from Tools Ayoob helps web authors, designers, developers and content creators check how images and color-driven UI elements will appear to people with different types of color vision deficiencies. Use the uploader to test your own images (charts, product photos, UI screenshots). The simulator applies mathematically-approximated color transformation matrices to the image pixels in the browser — nothing is uploaded to a server, ensuring privacy. Why this helps: • Designers can verify that important information is not conveyed by color alone. • Content creators can validate cover images, charts and infographics for accessible contrast. • Developers can test palette changes and find accessible replacements. This free tool is part of the Tools Ayoob collection — a fast, free set of web utilities created to help publishers and creators. Visit the homepage: https://freeaitoolsayoob.com/

SEO & Keywords

Suggested SEO keywords and metadata to use with this tool or article:

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deuteranopia simulation
tritanopia visibility test
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Full Details (1000+ word post)

Color blindness—also called color vision deficiency (CVD)—affects a sizable portion of the population and can change the way people perceive images, graphics, charts and user interfaces. For designers, marketers, and publishers who rely on color as a primary means of conveying information, understanding how content will appear to someone with color vision deficiency is essential for delivering accessible experiences. This Color Blindness Simulator is designed with practical, real-world testing in mind. It runs entirely in your web browser and applies color transformation matrices to image pixels to approximate common forms of CVD: protanopia (red-weak), deuteranopia (green-weak), tritanopia (blue-weak), and achromatopsia (complete color loss). Because transformations happen locally in JavaScript using an HTML canvas element, your images do not leave your device—preserving privacy while enabling quick iteration. How to use the tool: 1. Upload an image using the Upload button (supported formats: JPG, PNG, WEBP). The canvas will render your image. 2. Choose a simulation mode from the dropdown. The preview updates immediately so you can compare the normal and simulated views. 3. Download the simulated image if you want a record or to share the result with colleagues. 4. Use the share buttons to create social posts about the tool or copy the link to send to teammates. 5. Leave a rating and a comment to help us improve the simulator. Why this matters for accessibility and SEO: Search engines and accessibility checkers increasingly favor content that is inclusive and accessible. Images and design elements that communicate information exclusively through color can create barriers for visitors with CVD and can reduce engagement and conversions. Testing visuals before publishing ensures that essential information has non-color alternatives (labels, icons, textures, patterns) and adheres to WCAG contrast recommendations. Practical tips for inclusive color usage: • Avoid relying on color alone to convey meaning — pair color with icons, text labels or patterns. • Check color contrast between foreground and background using contrast checkers; aim to meet at least WCAG AA for normal text. • For charts, add direct data labels and consider texture or shape differences between series. • Use palettes known to be CVD-friendly (many modern palettes are designed to be distinguishable by people with common forms of CVD). Technical notes: The color matrices used are approximations derived from research into color perception under photoreceptor loss. While this simulator provides a close representation for design testing, remember that individual perception may vary and diagnosis of CVD requires professional testing. We include an achromatopsia (grayscale) mode to simulate rare, severe cases where color perception is minimal or absent. Privacy & performance: All processing is done client-side; images you upload are not sent to any server. The simulation uses a canvas drawImage + pixel manipulation approach which performs well on modern desktop browsers. For very large images, consider resizing before upload to speed up previews. Use cases and suggestions: • Web designers ensuring UI elements (buttons, progress bars, notifications) remain clear under simulation. • Content teams validating marketing imagery so product differences remain visible. • Data journalists checking that color-coded maps or charts remain interpretable. • Educators demonstrating color perception differences. About Tools Ayoob: Tools Ayoob (https://freeaitoolsayoob.com/) is a collection of lightweight, free web utilities created to help creators, developers and site owners build, test and publish better content. The suite includes converters, accessibility tools, optimization helpers and developer utilities. Our tools emphasize privacy and client-side processing whenever possible so your files remain on your device. If you found this tool helpful, please rate it, share it with your team, and leave feedback. We actively read comments and use them to improve the simulator and add new simulation types and features. Contact & contribution: If you have suggestions or want to contribute code, please visit our homepage and contact the Tools Ayoob team. For bug reports, include your browser name/version and the image you used so we can reproduce the issue. Legal: This tool is provided as-is for testing and design purposes. It does not provide medical diagnosis or professional assessment. For clinical concerns about color vision, consult an eye-care professional.

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Tools Ayoob — https://freeaitoolsayoob.com/