I am trying to project a layer into the web mercator projection used for the basemaps on ESRI online. I created the layer using Arcmap and I am trying to use the Project tool in this program to convert from WGS84 to Web mercator. I am having problems locating the Web mercator transformation in Arcmap. I can find mercator but not Web mercator. I understand that the two projections are different and my layer will not be aligned properly on the basemap if I use the mercator projection. Any assistance would be greatly appreciated.