STP is a file format used by popular CAD software. STP contains 3-dimensional data saved in the Standard for the Exchange of Product Data (STEP, ISO 10303) file format.
The quick and simple way to handle your files is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch conversions. As you will soon realize, reaConverter will help you avoid spending countless hours trying to figure out how to convert multiple STP files as once.
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3D 3DS 3MF AC AC3D ACC AMJ ASE ASK B3D BLEND BVH COB CSM DAE ENFF FBX GITF GLB HMP IRR IRRMESH LWO LWS LXO MD2 MD3 MD5 MDL MS3D NDO NFF OFF OGEX PK3 PLY PRJ Q3D Q3O Q3S SCN SMD STL STEP SIB TER UC VTA X3D XGL ZGL HMB M3D MESH MOT PMX C4D