STP is a file extension for a 3-D graphic file used by CAD software
STP files can be opened by Computer Aided Three Dimensional Interactive Application(CATIA ) a CAD software app marketed by IBM company.
We can view,download,share stp file online using AUTODESK online stp viewer Tool
Link:https://viewer.autodesk.com/
Simply signup for free and upload your .stp file and wait for some time. You will get a downloadable,shareable view of file uploaded.
Example File: