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Simulate protanopia, deuteranopia and tritanopia on any image or screenshot — great for checking accessibility before you ship.
Drag & drop your file into the tool above, or click Choose Files to browse.
Adjust any settings in the panel on the right to match your needs.
Click the action button and wait a moment while we process your file.
Download your result instantly — 100% browser-based, nothing leaves your device.
Built for speed, privacy and reliability — on any device.
Just upload your file, adjust any settings, and click the button. Done in seconds with no learning curve.
Everything runs locally in your browser. Your files never leave your device — complete privacy guaranteed.
Use Color Blindness Simulator on Windows, Mac, Linux, iOS or Android — any modern browser works perfectly.
No account needed. Color Blindness Simulator is completely free with no file size limits for standard documents.
Preserve image fidelity with lossless processing options. Export to the format that suits your workflow.
Yes, Color Blindness Simulator is completely free. There are no hidden fees, subscriptions or account requirements. Just open the tool and start.
Color Blindness Simulator runs entirely in your browser. Your files are never uploaded to any server — they stay on your device the whole time, so your data is always private.
There is no hard file size limit enforced by the tool. Very large files may take longer to process depending on your device's memory and browser performance.
The tool supports the most common image formats including JPG, PNG, WebP, GIF and BMP. Output format options are shown in the settings panel.
The tool works in all modern browsers including Google Chrome, Mozilla Firefox, Microsoft Edge, Safari and Opera. We recommend keeping your browser up to date for the best experience.
See your design through color-blind eyes