What does the 3MF keep?

The shape: every triangle of every mesh, placed where the model shows it, as one object. A rigged or animated model is written in its rest pose. Colours and textures are not written; your slicer gives the model its filament colours.

Which way up, and how big?

Slicers expect Z up and millimetres, while glTF is Y up in metres, so the model is turned upright, centred on the plate and set down on it. By default the longest side is 100 mm. Type any length, or choose real size to print it at its own dimensions.

glTF splits a model's corners wherever its texture or shading changes, so a model that looks closed is, to a slicer reading it as it is, many loose pieces. The 3MF joins corners that sit at the same point back into one: the Khronos Duck's 2,399 glTF vertices became one closed mesh of 2,108, and the elephant and fox samples closed the same way.

That depends on the mesh, not the file format. Models made for screens can have holes, very thin parts or pieces that only touch; welding closes the seams the format made, not the holes the model has. Check your slicer's preview before you print.

Can it read compressed GLB files?

Yes. Draco and meshopt compressed geometry and WebP textures are read in the browser, and an FBX, OBJ, STL or .gltf with its files opens the same way.

No. The model is read and the 3MF written by your own browser, in the background of this tab. Nothing is sent to a server or stored.

Free browser tool

GLB to 3MF converter.

Turn a GLB, glTF, FBX or OBJ model into a 3MF for Bambu Studio, Orca, PrusaSlicer or Cura: upright, in millimetres, centred on the build plate, at the size you choose. It runs in your browser and your file never leaves your device.

Your model, on the stage

GLB, glTF, FBX, OBJ, STL, 3MF or a .zip · Up to 150 MB · No upload

Drop a model to convert it.

A .glb, .gltf, .fbx, .obj, .stl or .3mf, with its textures (or the whole folder). Check it in 3D, then download it in the format you need.

Your files stay in this browser tab.

Open a .glb, a .gltf with its files, an .fbx, .obj, .stl or .3mf, or a .zip of any of them. Select it together with the files it uses (a .gltf's .bin, an .obj's .mtl, textures), or drop the whole folder. A Mixamo character's FBX selected together with its animation FBXs becomes one GLB with every animation. Several models at once (an asset pack's folder or .zip) are converted or made smaller together and download as one .zip. Files are neither uploaded nor saved. Closing the model or leaving this page releases them.

Create a model in the studio →

How it works

Drop a .glb (or a .gltf, .fbx or .obj with its files). It opens in 3D with a report of its triangles and size.
Choose 3MF for 3D printing, set the length of the longest side (or real size), and convert.
Download the .3mf and open it in your slicer.

Need an STL instead? GLB to STL writes the same shape in the same place. Want something new to print? Almighty turns a sentence or a photo into a textured 3D model.

More free 3D file tools

Questions

What does the 3MF keep?: The shape: every triangle of every mesh, placed where the model shows it, as one object. A rigged or animated model is written in its rest pose. Colours and textures are not written; your slicer gives the model its filament colours.
Which way up, and how big?: Slicers expect Z up and millimetres, while glTF is Y up in metres, so the model is turned upright, centred on the plate and set down on it. By default the longest side is 100 mm. Type any length, or choose real size to print it at its own dimensions.
Why weld the seams?: glTF splits a model's corners wherever its texture or shading changes, so a model that looks closed is, to a slicer reading it as it is, many loose pieces. The 3MF joins corners that sit at the same point back into one: the Khronos Duck's 2,399 glTF vertices became one closed mesh of 2,108, and the elephant and fox samples closed the same way.
Will it print?: That depends on the mesh, not the file format. Models made for screens can have holes, very thin parts or pieces that only touch; welding closes the seams the format made, not the holes the model has. Check your slicer's preview before you print.
Can it read compressed GLB files?: Yes. Draco and meshopt compressed geometry and WebP textures are read in the browser, and an FBX, OBJ, STL or .gltf with its files opens the same way.
Is my file uploaded?: No. The model is read and the 3MF written by your own browser, in the background of this tab. Nothing is sent to a server or stored.