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When this tool is useful
Use this for a quick check of charts, maps, and badges that rely on color differences. Upload an image and choose an approximate protanopia, deuteranopia, or tritanopia view.
Color blindness simulator
Use browser-side simulation as a quick accessibility check.
Color blindness simulator
This is an approximation and may not match a real color-vision experience exactly.
What to check before using it
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How the result is produced
The browser applies a simplified color-vision transformation matrix to each RGB pixel and redraws the canvas. It is a screening preview for possible distinctions, not a diagnosis or a reproduction of one person’s vision.
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Worked example and interpretation
If red and green status badges become hard to distinguish in a preview, add an icon, pattern, or text label. Comparing the original with all three modes helps locate color-only information.
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Scope and limitations
Color vision varies between people, while display brightness and ambient light also affect perception. Combine this preview with contrast checks and testing by real users.
Frequently asked questions
Does Color blindness simulator send my upload to a server?
No. Image reading and canvas processing currently happen in the browser. On a shared device, also manage downloaded files and browser history appropriately.
Does Color blindness simulator preserve the original resolution?
No. Processing uses a fixed preview canvas for performance, so it is not an archival conversion or a replacement for full-resolution editing.
Can I use a PNG from Color blindness simulator commercially?
The tool grants no rights to the source. Upload material you are allowed to use and review copyright, trademarks, and final production quality yourself.