Project to convert from various coordinate types to other coordinate types.
Converts from and to: Universal Transverse Mercator (UTM), Military Grid Reference System (MGRS), Decimal Degrees (DD), Degrees Decimal Minutes (DDM), and Degrees Minutes Seconds (DMS).
https://pjobson.github.io/bulk-coordinate-converter/
Just clone the repo to your local http server and browse to it.
Free bugs, all you can eat!
I have no current plans to add other coordinate types.