Free 3D converter
Drop a STL file and download it as 3MF, 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 STL file here
Converted to 3MF 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 .stl file or choose it from your device.
Turn the model, check its triangle count, and set the height you want to print in millimetres.
The .3mf is written in a second or two for most models.
3MF records millimetres, so the model can't arrive 1,000 times too big or too small the way an STL sometimes does.
Bambu Studio and PrusaSlicer save their projects as 3MF, so the file drops straight into the same workflow.
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.
3D Manufacturing Format
3MF is an open, zip-based XML format from the 3MF Consortium (founded in 2015) built to replace STL for printing. Unlike STL it records units, so a model always opens at the right size.
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 STL never leaves your device.
The converter shows the output size in millimetres before you download. Set a height to scale it, or keep the original size.
No. This converter writes plain 3MF meshes without colour. For a full-colour print, keep the STL 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.
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.