Considering that some visualizations of 3D formats can be exported as plain pictures and so stl to jpg conversion is like doable, especially for some kind of preview purpose. The picture resulting from this conversion no longer work as the original 3D formats, models, meshes or other data but simply are images of what can be seen on the monitor and of course won't be useable in such 3D/CAD software anymore.
Open STL file Open JPG fileA CAD and Gerber conversion software
A 3D CAD translation software