Assuming I've a point like this :
POINT (751318 9760879)
This point is in EPSG:27700 coordinate reference system.
How do I convert the point to display in a map with EPSG3857 coordinate reference system ?
I don't use any GIS application. I am developing a web application (using leafletjs ). So I don't want to convert data with a tool,I've to convert in code.