GLB to 3MF Converter

Turn GLB models into slicer-ready 3MF: millimetres, Z up, resting on the plate, with base-color materials as filament colors.

  • Files stay on your device
  • Free, no sign-up
  • Units and up axis handled
  • Batch and .zip

Drop a GLB file to convert

One file, many, or a .zip

In: STL · STEP · IGES · OBJ · 3MF · GLB · glTF · PLY · FBX · DAE · 3DS · AMF · VRML · ZIP

Converted on your device. Nothing is uploaded.

    How to convert GLB to 3MF

    1. Drop your GLB files

      Drop .glb files, including Draco, Meshopt and KTX2 compressed ones.

    2. Check the preview

      The model appears at the size and orientation it will have. Fix the file units, up axis or size under Size, units and orientation if needed.

    3. Choose 3MF options

      Keep parts as one object for a simple print, or tick separate objects to move them independently in the slicer.

    4. Convert and download

      One file downloads straight away. A batch gives a download per file and one .zip of all of them.

    What carries over from GLB to 3MF

    Worked out from what each format can store and what this converter writes. Nothing is changed silently: the preview shows the size and orientation before you download.

    Geometry Every triangle is kept at full precision.
    Color Material, face and painted colors become slicer filaments (up to 16). Textures and vertex colors do not, so those models come out single-color.
    Units Converted from metres to millimetres, so it keeps its real size. A 0.05 m part comes out 50 mm.
    Orientation Turned from Y up to Z up, so it stands on the plate in a slicer.
    Objects One object by default, or one 3MF object per part. Placed on Z = 0 and centered on a 256 mm plate.
    Animation Dropped: the model is written in its rest pose.

    GLB to 3MF: what actually happens

    The converter turns glTF's metres and Y up into a 3MF in millimetres and Z up, resting on the plate. Meshes with plain base colors (no texture) become painted filament colors, up to 16, that Bambu Studio and OrcaSlicer open already assigned.

    Most AI-generated GLBs color with a texture instead. Textures are not filament colors, so those come out single-color; the AMS converter reduces a texture to 2 to 8 filaments for a multi-color print.

    GLB at a glance

    glTF 2.0 binary · .glb

    Stores
    Meshes, PBR materials, textures, animation and scenes in one binary file
    Color
    Full: textures, base colors and vertex colors
    Units
    Metres, fixed by the glTF spec
    Up axis
    Y, fixed by the spec
    File size
    Compact; Draco or Meshopt compression shrinks meshes 5 to 10 times
    Opens in
    Web viewers, Blender, Windows, Android Scene Viewer, Godot, Unity and Unreal importers

    glTF 2.0 is the Khronos Group's "JPEG of 3D", and GLB is its single-file binary form. It is what AI 3D generators, Sketchfab downloads and web apps hand out, and it is the only common format whose units (metres) and axes (Y up) are fixed by the spec.

    Open GLB files in the viewer

    3MF at a glance

    3D Manufacturing Format · .3mf

    Stores
    A zipped XML model: shared vertices, objects with transforms, a build plate
    Color
    Materials and per-triangle colors; slicers add painted filament colors
    Units
    Declared in the file, millimetres by default
    Up axis
    Z
    File size
    Compressed, usually under half of a binary STL
    Opens in
    Bambu Studio, OrcaSlicer, PrusaSlicer, Cura, Creality Print

    The 3MF Consortium (founded 2015 by Microsoft, Autodesk, HP and others) designed 3MF to replace STL for printing. Bambu Studio, OrcaSlicer and PrusaSlicer save whole projects in it: plates, painted colors and print settings alongside the meshes.

    Open 3MF files in the viewer

    Tips for GLB to 3MF

    Set a size

    AI models are often a metre or two across; set a target height in millimetres.

    Check watertightness

    Open the 3MF in the 3MF viewer for a mesh check.

    Single color

    Want one color? GLB to STL is simpler.

    GLB to 3MF FAQ

    Does GLB to 3MF keep textures?
    No. Textures become one color. Use the AMS converter to turn them into filaments.

    Which colors are kept?
    Base colors of untextured materials, as filament colors.

    Is the 3MF to scale?
    It has the GLB's size converted to millimetres. Set a height if the GLB isn't built to scale.

    Is the converter free? Are there limits?
    Free, with no sign-up, watermark or file count limit. Batches and files of a few hundred MB work on most laptops; the only limit is your device's memory.

    Are my files uploaded?
    No. Files are read and written by JavaScript and WebAssembly in your browser and never sent to PrintPal. The STEP and IGES reader is the only extra download, once, from a public CDN.