Free Color Blindness Simulator

A color blindness simulator shows how an image looks to someone with color vision deficiency. It applies a color transform for each type, like protanopia or deuteranopia, so designers and creators can check whether their work relies too heavily on color. Pixellize does this in your browser on any JPG, PNG, or WebP.

The simulation is a close approximation, not a medical diagnosis. It uses standard color-transform matrices for each vision type, which is the same approach used by many accessibility tools. It is accurate enough to guide real design decisions, but individual color vision varies, so treat it as a strong guide rather than an exact result.

You can simulate 8 types: protanopia, deuteranopia, and tritanopia (the full red, green, and blue-blind forms), their milder anomaly versions, and achromatopsia and achromatomaly for total and partial color blindness. Deuteranopia and protanopia are the most common, so start there.

Yes, it is completely free with no signup, no email, and no watermark. You can test as many images as you like. Everything runs in your browser, so there are no upload limits and your images stay private.

No. The simulation runs entirely in your browser using the HTML canvas, so your image never leaves your device. That makes it safe to test unreleased designs, client work, or anything confidential without it touching a server.

Because about 1 in 12 men has some color vision deficiency, so a real share of your audience may miss color-coded information. Testing catches charts, buttons, and labels that rely on color alone, so you can add labels or patterns and make the design work for everyone.