GLB to glTF Converter

Unpack a GLB into readable glTF JSON to inspect nodes, meshes and materials, or to edit them by hand.

  • 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 glTF

    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 glTF options

      Written as a single .gltf with the buffers embedded, in metres and Y up.

    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 glTF

    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 Kept: materials, textures and vertex colors are embedded.
    Units Both are in metres, so sizes are unchanged.
    Orientation Both are Y up, so it stays the right way up.
    Objects Each part stays a separate object or mesh.
    Animation Dropped: the model is written in its rest pose.

    GLB to glTF: what actually happens

    A GLB is a binary container; the .gltf form is JSON you can open in any text editor. The converter writes a single .gltf with the buffers and textures embedded as data, so it stays one file while becoming readable.

    The data is rebuilt from the loaded scene: meshes, materials and textures come across, Draco and Meshopt are decompressed, animations and skins are dropped. Units and axes are unchanged (metres, Y up), since both are glTF.

    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

    glTF at a glance

    glTF 2.0 JSON · .gltf

    Stores
    A JSON scene that points at .bin buffers and image files (or embeds them)
    Color
    Full: textures, base colors and vertex colors
    Units
    Metres, fixed by the spec
    Up axis
    Y, fixed by the spec
    File size
    JSON plus buffers; embedded base64 adds about a third
    Opens in
    Web viewers, Blender, three.js, Babylon.js, game engines

    A .gltf is the readable JSON form of glTF 2.0. The geometry usually sits in a separate .bin file and textures in image files, which makes it easy to inspect and edit, and easy to break by moving one file.

    Open glTF files in the viewer

    Tips for GLB to glTF

    Separate .bin?

    For a .gltf with a separate .bin and image files, use Blender's glTF exporter with "glTF Separate".

    Large files

    Embedded data is base64, about a third larger than the GLB.

    Just looking?

    The GLB viewer shows triangle counts, materials and size without converting.

    GLB to glTF FAQ

    What is the difference between GLB and glTF?
    The same glTF 2.0 data, as one binary file (GLB) or as JSON (.gltf), here with the data embedded.

    Are animations kept?
    No. The converter writes static meshes, materials and textures.

    Why is the .gltf larger?
    Binary data is stored as base64 text inside the JSON, which adds about 33%.

    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.