Color blindness simulator
Named simulation model, preview modes and clear limits of simulation..
Accepted files: see this tool’s format requirements. Choose one file. Up to 100 MB in total; individual format limits may be lower.
Up to 1,000,000 characters. Review the settings before running.
Your result
How to use Color blindness simulator
- Choose a file in a supported format.
- Review the settings, then choose Run Color blindness simulator.
- Review the result, then use Copy result or a download link when available.
Working with color blindness simulator
Accessibility utilities can calculate contrast, inspect markup and help draft descriptions. They answer specific questions, but a usable experience also depends on navigation, context and the way content is presented to people using different technologies.
Common questions
Does every image need a long description?
No. The useful description depends on the image’s purpose and nearby text. A decorative image and a chart conveying important information need different treatment.
Can an automated pass certify the whole experience?
No. Automated checks cover only part of the problem. Use them to find issues, then review interactions and content with the intended users in mind.