Essential

Free online STL editor: edit and repair

Import an STL or OBJ file to prepare it for 3D printing. Sculpt the surface, repair the mesh, reduce triangles, set dimensions in millimetres and create a flat base. Export the edited model as an STL for your slicer.

Free editor, no sign-up or installation. Free exports include ads and a weekly limit shared across the three tools; Partner plans include unlimited exports without ads.