Preview your image or design through eight kinds of colour-vision deficiency to check it still reads — on your device.
Simulated on your device — nothing is uploaded
No size limit · files are processed on your device and never uploaded · how it works
Runs in your browser. Files are never uploaded — you can go offline after the page loads.
How to use the Colour Blindness Simulator
Drop an image or design.
Switch between the colour-vision types.
Download any simulation to share.
Easy to use
Drop files, pick options, download. Whole folders at once, no signup, no daily limit.
Best quality
The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.
Private & secure
Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.
Does your design work for everyone?
Around one in twelve men and one in two hundred women has some form of colour-vision deficiency. This runs your
image, chart, UI or logo through eight simulations — protanopia, deuteranopia and tritanopia plus their milder
anomalies, and full achromatopsia — so you can see whether the colours you chose still carry the meaning.
It uses well-established simulation matrices — a close approximation rather than a medical test, but more than
enough to catch a red/green combination that vanishes for a big slice of your audience. Everything runs in your
browser. Pick accessible colours with the colour picker.
Frequently asked questions
What is this for?
About 1 in 12 men has some colour-vision deficiency. Simulating it on a chart, UI or logo shows whether your colour choices still communicate — a quick accessibility check.
How accurate is it?
It uses well-known simulation matrices — a close approximation, not a medical tool, but reliable for catching colour combinations that break down.
Is my image uploaded?
No — the simulation runs entirely in your browser.
Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.
No upload, ever. Turn off Wi-Fi after the page loads and every tool keeps working.
No limits. No file-size cap, no queue, no watermark, no account.
Runs on your CPU. Batches use several cores in parallel; nothing is throttled.