Optimize GPX-Track to existing road/way


I’m searching for an online-editor, which can move my gpx-track exactly to a path of an existing road or way. I know that there is such a thing, but I don’t find the website.

My GPX-tracks are beside the roads and are not the direct route. I want to import my track into the map, optimize and download it. Later I want it to show in a officially map.

Do you know a solution??

Thank you very much in advance!

What sort of GPX track is it? cycle.travel can do this if it’s a bike ride on minor roads and cycleways (but not, or at least not well, if it’s on busy roads or rough tracks).