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ColorBlind

Preview any image through the common kinds of colour-vision deficiency, and find the colour pairs that become hard to tell apart.

Runs in this tab. Nothing is uploaded. Works offline.

ColorBlind showing a sample status chart next to its deuteranopia simulation, where red and green turn the same olive colour
What you'll get, shown on the tool's own sample
Image InputPixels are transformed in your browser. Nothing is uploaded.
Drop a screenshot, chart or design
or click to choose an image. It stays on your device.

PNG, JPG, WebP, GIF or SVG. Big images are scaled down to 900 px on the long side, and the simulated download is that size too.