Color Blindness Simulator

Apply colour vision deficiency matrices to a colour or an image and compare the results.

Simulate colour vision

Colour Vision type

Original: #e0342a · Simulated: #e0342a

Left is the original, right is the simulation. Paste an image with Ctrl and V, or drop one on the canvas.

Common questions about the free online color blindness simulator.

It rewrites the colours of a value or an image as they appear to people with a colour vision deficiency, so you can check contrast and clarity.

Protanopia, deuteranopia, tritanopia and achromatopsia, matching the four deficiencies that matter most for interface and chart design.

It uses the full severity Machado, Oliveira and Fernandes matrices for the three cone deficiencies, and the sRGB luminance weights for achromatopsia.

The published matrices are defined on linear light. Applying them there keeps the results accurate instead of distorting mid tones.

Yes. Load an image file, drop one on the canvas, or paste one from the clipboard, and both halves of the canvas are drawn for you.

Roughly one in twelve men and one in two hundred women have some form of colour vision deficiency, most often deuteranopia or protanopia.

Red and green pairs are the hardest to separate, so add a shape, an icon or a text label whenever colour alone carries the meaning.

No. The image is read in your browser, drawn on the canvas and filtered locally, so no pixel ever leaves your device.

Yes. The simulated hex value is shown under the canvas and the copy button places it straight on your clipboard.

Last updated: October 10, 2026