Paste a SMILES or draw the molecule, and read the conformers off the list: each one minimised with MMFF94, ranked by its energy relative to the best shape found, and selectable in the 3D view.
Measure a distance, an angle or a dihedral on any of them, refine the set with GFN2-xTB when a force field is not enough, and save the whole set as an SDF.
Conformers in 3D from a structure you draw. This tool needs JavaScript; these are the pages it offers: