WGS 84 Ellipsoid to NAD 83 Geoid converter tool

Can anyone recommend a app or a conversion tool to turn WGS 84 Ellipsoid CVS file into NAD 83 Geoid CVS file?

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Here’s good one.


There is a PC version on the page as well, but I found it to be overkill.


Thank you very much Sir, you have been so kind!