Color Blindness Simulator
Test how your designs, images, and websites appear to people with different types of color vision deficiency. Make your digital content more accessible with this easy-to-use simulator.
Color Blindness Simulator
Free online color blindness simulator. Test designs for accessibility by previewing how they appear to people with protanopia, deuteranopia, tritanopia and other color vision deficiencies.
Drag & drop an image here
or
Supported formats: JPEG, PNG, GIF, SVG, WebP, and more.
All processing happens in your browser - files are not uploaded to any server.
Designing for Color Blindness Accessibility
Do:
- ✓Use strong contrast between text and background
- ✓Include patterns or textures to differentiate areas in charts and graphs
- ✓Use labels or icons in addition to color coding
- ✓Test designs with color blindness simulators (like this one)
- ✓Use colorblind-friendly palettes like blue/orange instead of red/green
Don't:
- ✗Rely solely on color to convey important information
- ✗Use red and green together as contrasting colors
- ✗Place blue and purple adjacent to each other without clear borders
- ✗Use low contrast between text and background colors
- ✗Design interfaces where color is the only visual cue
Key Features
Professional-grade tool designed for speed, security, and simplicity
Multiple Simulations
Preview common color vision deficiencies: protanopia, deuteranopia, tritanopia, and achromatopsia.
Image & UI Preview
Test full images or live UI snippets to find problematic color combinations.
WCAG Guidance
Includes recommendations to improve accessibility and contrast.
How the Simulator Works
Transforms image colors using color vision deficiency matrices to approximate user-visible results.
Upload or paste
Provide an image or screenshot to preview.
Select simulation
Pick a deficiency to preview (protanopia, deuteranopia, etc.).
Review & adjust
Use WCAG tips to modify colors for better accessibility.
Who Uses This
Designers
Improve UI contrast and color choices for accessible design.
Content Creators
Verify images and graphics are accessible to a wider audience.
Preliminary Test Notice
This simulator provides an approximate preview of how colors may appear to people with various color vision deficiencies. It is intended for design and accessibility checks only and is not a medical diagnostic tool. If you suspect you or someone else may have a color vision condition, please consult a qualified optician or eye care professional for a formal assessment.
Similar Tools
Tools for generating various types of data and files.
Color Blindness Statistics
of men have some form of color vision deficiency
of women have some form of color vision deficiency
people worldwide are affected by color blindness
WCAG Accessibility Guidelines
The Web Content Accessibility Guidelines (WCAG) provide recommendations for making web content more accessible to users with disabilities, including those with color vision deficiency:
1.4.1 Use of Color (Level A)
Color is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element.
1.4.3 Contrast (Minimum) (Level AA)
The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, with a few exceptions for large text, incidental text, and logotypes.
1.4.11 Non-text Contrast (Level AA)
The visual presentation of user interface components and graphical objects have a contrast ratio of at least 3:1 against adjacent colors.