Loading tool…
Preview Images With Colour-Vision Deficiencies
Check how the colours in a chart, design or photo may appear with different forms of colour-vision deficiency. Your file is processed on this device.
Your image is processed by your own browser and never uploaded. Many online editors send your photo to their servers and delete it later — this one never receives it at all.
Why use Colour Blindness Simulator
- Seven vision types
- Anomaly severity control
- Dominant-colour confusion warnings
- Private worker-based processing
Popular uses
- Checking chart series colours
- Reviewing UI screenshots
- Comparing design alternatives
Colour Blindness Simulator: frequently asked questions
Are my images uploaded?
No. Decoding, simulation and comparison happen in your browser.
Which vision types are available?
Protanopia, deuteranopia, tritanopia, their anomaly forms, and achromatopsia.
Is this an exact representation of individual vision?
No. This is a mathematical approximation. Individual perception varies.
How are colour warnings calculated?
Dominant colour pairs are compared in OKLab before and after simulation. Use labels and patterns as well as colour in important charts.