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User quotes:
For me as a man with normal vision it was a shock and an eye opener to see what it means to be colorblind. Of course I knew about the existence of colorblindness, but I discovered that I had no idea what it really means. I became quite interested and followed many of your links to learn more about this deficit. I use vischeck to ensure that our site is at least readable to people with colorblindness. Thank you for this very interesting view in the world of the colorblind!
-Herman W., webmaster
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Try Vischeck on Your Image Files

Select the type of color vision to simulate:

deutan hats Deuteranope (a form of red/green color deficit)
protan hats Protanope (another form of red/green color deficit)
tritan hats Tritanope (a blue/yellow deficit- very rare)

Image file:


  • Vischeck accepts most common image formats. However, we recommend that you use PNG or JPEG format for uploading large images as these tend to transfer faster.
  • For PowerPoint slides, you can save all your slides as PNG images with "Save As..." and run Vischeck on each slide.
  • If you have many images to process, consider downloading Vischeck to run on your own computer.)
  • Uploading a large file may take a while - please be patient!

Privacy policy. Contact: Last modified 2014-Feb-04 23:11 GMT.