Color Blindness Simulator
See images as color blind people do — simulate deuteranopia, protanopia, tritanopia and achromatopsia online free, with adjustable severity.
Processed locally in your browserHow?
This tool runs in this browser tab. The files, text and values you enter are not uploaded to clkr.work servers — closing the tab clears them. Anonymous usage events (such as which button was pressed) are counted, never your content. Privacy policy
What next?
Found it useful? Share Color Blindness Simulator
Free, no sign-up, works in the browser — send it to a friend or add it to your site.
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Part of the toolkit
How to use Color Blindness Simulator
- 1Upload, drop or paste an image — or use the built-in color sample
- 2Choose a type of color blindness and set the severity (100% = complete, lower = mild)
- 3Compare the original and simulated views side by side and download the result
Frequently asked questions
How do color blind people see?▾
Most color blind people see color, just with some colors confused. With the common red–green types (deuteranomaly and protanomaly), reds, greens, browns and oranges look similar, and purple can look blue. Complete color blindness (achromatopsia) is very rare.
What is the most common type of color blindness?▾
Deuteranomaly (reduced green sensitivity). Red–green color vision deficiency affects about 1 in 12 men (8%) and 1 in 200 women of Northern European descent.
What's the difference between -anopia and -anomaly?▾
-anopia means one type of cone is missing (dichromacy), so colors are fully confused. -anomaly means the cone works but is shifted, giving milder confusion. Use the severity slider to see the range from mild to complete.
How can I make my design color-blind friendly?▾
Don't rely on color alone — add labels, icons, patterns or text. Avoid red/green pairs for important states, use strong lightness contrast, and palettes like blue/orange that stay distinct for most people. Check your charts and UI here before publishing.
How accurate is this simulation?▾
It uses the Machado et al. (2009) model, widely used in research and accessibility tools, applied in linear RGB. It shows average color confusion; real experiences differ between people and screens.
Is my image uploaded?▾
No. The simulation runs in your browser, so the picture never leaves your device.
Embed Color Blindness Simulator on your website▾
Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.