Upload an image to simulate color blindness
Accepted formats: JPG, PNG, WEBP, BMP, GIF (non-animated)
Paste (Ctrl/⌘+V) or drop an image — or import from a URL
The color blindness simulator shows how an image is perceived by people with the three main types of color vision deficiency — protanopia (red-blind), deuteranopia (green-blind), and tritanopia (blue-blind). Image Machine applies the simulation pixel-by-pixel right in your browser, so nothing is uploaded and your image stays private. Drag the severity slider to preview anomalous color vision anywhere between normal sight and full dichromacy, then download the simulated PNG to check that your charts, UI, maps, or designs stay readable for everyone.
How It Works
Choose a tool
Pick from 120+ tools to resize, convert, compress, or enhance your image.
Upload & edit
Drag and drop your image and adjust the settings. It stays on your device.
Download
Save your result instantly — no watermark, no sign-up required.
Why Image Machine?
Your files never leave your device
All processing runs locally in your browser. Your images are never uploaded to a server.
Completely free
Every tool is free, with no limits, no watermarks, and no hidden costs.
Lightning fast
No upload waiting — your images are processed instantly on your own device.
Professional quality
Pixel-perfect output with full control over format, size, and quality.
Frequently Asked Questions
What are protanopia, deuteranopia, and tritanopia?
They are the three main forms of color blindness. Protanopia and deuteranopia are red-green deficiencies — the most common, affecting roughly 8% of men — while tritanopia is a much rarer blue-yellow deficiency. The simulator lets you preview all three so you can design for the widest audience.
Is this a medical or diagnostic tool?
No. It is a perceptual simulation built for designers and developers to test color accessibility, not a clinical instrument. It estimates how colors shift for each type of deficiency so you can spot combinations — like red text on a green background — that may be hard to tell apart.
Does the severity slider matter?
Yes. Many people have anomalous trichromacy — a partial deficiency rather than full color blindness. Setting severity to 100% simulates complete dichromacy, while lower values approximate milder, more common forms, helping you check your design across the whole range.