Free 3D converter
Drop a glTF file and download it as STL, scaled and set on the build plate. The conversion runs in your browser, so the file never leaves your device. It keeps the exact shape and a real size in millimetres.
Drop a glTF file here
Converted to STL in your browser. Nothing is uploaded.
GLB, glTF, OBJ, STL, PLY, FBX or 3MF, up to 300 MB. Add .mtl, .bin and texture files alongside.
Drop the glTF file, with its textures and .bin if it has separate ones.
Turn the model, check its triangle count, and set the height you want to print in millimetres.
The .stl is written in a second or two for most models.
Every slicer reads STL. The glTF becomes a plain list of triangles, sized in millimetres and ready to slice.
Print bureaus and online quote tools ask for STL more than anything else.
glTF 2.0 (JSON)
A .gltf file is the text form of glTF 2.0: a JSON scene description that points to a separate .bin buffer and image files, or embeds them as data.
Stereolithography
STL was created by 3D Systems in 1987 for its stereolithography printers. It stores a surface as a list of triangles and nothing else: no colour, textures or units.
Yes. There is no account, watermark or limit on conversions. It accepts files up to 300 MB; how large a model your browser can handle depends on your device's memory.
No. The conversion runs in your browser with the open-source three.js loaders and exporters, so your glTF never leaves your device.
glTF is measured in metres and slicers read STL as millimetres. AI-generated models are usually around a metre across, so the converter scales them to a height you choose (100 mm by default). Turn that off to keep the real size.
No. STL stores only triangles. For a full-colour print, keep the glTF and colour it in your slicer, or export to OBJ with its texture.
The converter keeps the shape exactly; it doesn't repair it. Slicers fix small holes automatically. For meshes with many open edges, run them through your slicer's repair or Blender's 3D Print Toolbox first.
Select the .gltf, .bin and images together and they are resolved by name. A .gltf with everything embedded works on its own.
Yes. PhotoGenius turns a photo or a text prompt into a textured GLB with Rodin Gen-2.5, Rodin Gen-2.5 Fast, Tripo H3.1, TRELLIS.2, Rodin Gen-2 or Hunyuan3D 3.1, which you can then convert here. See Image to 3D model.
Rodin Gen-2.5, Rodin Gen-2.5 Fast, Tripo H3.1, TRELLIS.2, Rodin Gen-2 or Hunyuan3D 3.1 builds a textured GLB from one image. The price shows before you run it.