Convert GLB to STL — Free, No Signup

About This Converter

A GLB is a whole scene in one binary file: several meshes arranged in a node hierarchy, physically based materials, embedded textures, vertex colours, skinning and animation. An STL is one surface described as loose triangles. Converting between them is less a translation than a reduction, so it is worth knowing exactly what is left standing at the end. The output is a single binary STL. Every mesh in the scene is baked into place using its node transform and merged into one triangle soup, so a model that arrived as body, lid and handle becomes one object with all three still in their correct relative positions. Materials, embedded textures, texture coordinates, vertex colours, node names, cameras and animation are all dropped, and per-vertex normals are replaced by one direction per triangle. The most common surprise is detail vanishing. In a GLB, a logo, a wood grain or an engraved-looking pattern is very often painted on rather than modelled, and paint has no thickness, so anything that lived only in the texture is simply gone from the STL, which will read as blank where you expected relief. The preview above shows geometry alone: if the detail is not visible there, it will not be in your download either. Size can move either way. Dropping the textures removes the bulk of most GLB files, while un-indexing works against you, because GLB shares a vertex between all the triangles that use it and STL repeats it in each of them at about fifty bytes per triangle. Two practical notes. A GLB that uses Draco or Meshopt mesh compression will not open here, so re-export it uncompressed from your 3D tool first. And watch the scale: glTF treats one unit as a metre, slicers usually read an STL unit as a millimetre, and the preview here resizes the model to fit its grid, so set the dimensions you actually want after import rather than trusting the number that comes through. Binary STL is what slicers, CAM software and print services expect, and Scene Editor imports it as well. Everything runs locally in your browser, with no upload and no account.