You're right. Thanks for the catch!

How are you rendering the macro?

I'm not. I'm using the default out of the box from Umbraco grid. The rendering is happening here /Views/Partials/Grid/Editors/Rte.cshtml

I can see where the view is parsing the umbraco internal links

@{
    var value = TemplateUtilities.ParseInternalLinks(Model.value.ToString(), Current.UmbracoContext.UrlProvider);
    value = TemplateUtilities.ResolveUrlsFromTextString(value);
    value = TemplateUtilities.ResolveMediaFromTextString(value);
}
@Html.Raw(value)

but there isn't anything to convert the macros, which is why they aren't rendering.

I was attempting to use RteMacroRenderingValueConverter without having to build a VS Project. I'm trying to only use razor on this project for various reasons. There might be a way to do it, but I'm not familiar enough with how.

I hate to refer you to docs, but late here..

You still have to use a macro partial to render the macro, you can definitely do this in razor without VS or compiling anything: https://our.umbraco.com/documentation/reference/templating/macros/

There isn't a problem with the macro partial. The macros work outside of the grid RTE. It works in a regular RTE that is added to a document type via a property. It works in the grid when using the default macro component. Rendering a macro in the view with Umbraco.RenderMacro works.

My problem is specifically about displaying a macro in the RTE via grid and what code is needed to run the default Umbraco process to convert the code Umbraco places by default in RTE (below) to a rendered macro.

<div class="umb-macro-holder siteVariantLink umb-macro-mce_1 mceNonEditable"><!-- <?UMBRACO_MACRO macroAlias="siteVariantLink" firstUrl="test" secondUrl="second" thirdUrl="654" forthUrl="655" linkTitle="testtitle" openInNewWindow="0" /> --><ins>Macro alias: <strong>siteVariantLink</strong></ins></div>

I could write something to converts the macro name and moves all of the macro parameters to render the Umbraco.RenderMacro code, but it would be time-consuming. My hope was that the Umbraco API would have some type of utility that already did this.

It may not and if it's late there, you don't have to find an answer. Was just putting it out there to the masses.

Unfortunately no, I never found a solution. I've just used the default "insert form" module for the grid.