Color blindness simulator
Check that the colors in a chart or sign can be told apart by everyone.
How to use
- Choose the image to check.
- The original and four simulations appear side by side.
- Where colors alone separate things and now look alike, add shapes, labels or patterns.
Questions
Is my image uploaded?
No. It is processed on a canvas inside your browser and never sent or stored.
How accurate is it?
It uses the Machado et al. (2009) model at full severity. Real perception varies, and milder forms (anomalous trichromacy) look closer to the original.
How common is it?
Red-green deficiency is commonly cited at roughly 5–8% of men and about 0.5% of women, varying by population; tritan and achromatopsia are rare.
Related tools
- Color converter (HEX, RGB, HSL)Convert between HEX, RGB and HSL, and check contrast against white and black text (WCAG).
- Image resizerResize photos by width, height or percent and save as JPEG, PNG or WebP, all in your browser.
- Invert image colorsInvert the colors of an image (negative), optionally in greyscale.
- Image mosaic / pixelate toolDrag over the parts of a photo to pixelate them: faces, number plates, personal details.
- SVG to PNG converterTurn an SVG file or code into a PNG at any size, with transparent or solid background.
- Favicon generator (ICO converter)Turn an image into a favicon.ico with 16, 32, 48 and 256 px sizes, plus an apple-touch-icon PNG.