emd to pes conversion is used for one of the many variants of embroidery design conversion, typically to transfer designs between different stitching / embroidery machines. You can certainly find embroidery software that can be used to achieve direct conversion between these two designs types.
If not, you can always use one of the exchange format for the transfer of the designs, perhaps something like Tajima DST or Janome JEF formats, that are supported in pretty much every embroidery.