glTF to GLB Converter

Pack a .gltf, its .bin buffers and texture images into one GLB file: easier to share, upload and drop into a web page.

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

Drop a glTF 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 glTF to GLB

    1. Drop your glTF files

      Drop the .gltf together with its .bin and textures, or a .zip of the folder.

    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 GLB options

      No options needed: GLB is written in metres, Y up, with materials and textures embedded.

    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 glTF to GLB

    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.

    glTF to GLB: what actually happens

    GLB and glTF hold the same glTF 2.0 data; GLB just packs it into one binary file instead of JSON plus side files. Drop the .gltf with its .bin and images, or a .zip of the folder, and get a single GLB back with the meshes, materials and textures embedded.

    The converter rebuilds the file from the loaded scene rather than copying bytes, so it also cleans up: it writes standard materials and decompresses Draco and Meshopt data. Animations, skins and morph targets are not carried. For a byte-exact repack of an animated asset, use glTF-Transform's copy command.

    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

    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

    Tips for glTF to GLB

    Animated assets

    Use glTF-Transform for animated or skinned files; this converter writes static meshes.

    Smaller GLB

    Re-apply Draco or Meshopt compression after packing for the web.

    Check textures first

    Open the folder in the glTF viewer to see that every texture resolves.

    GlTF to GLB FAQ

    Is glTF to GLB lossless?
    For static meshes, materials and textures, yes. Animations, skins and compression extensions are not carried over.

    Why is my GLB bigger than the .gltf files?
    Compressed (Draco or Meshopt) input is written uncompressed. Compress the GLB again if size matters.

    Do I need to drop the .bin and textures?
    Yes, unless they are embedded in the .gltf. A .zip of the folder is easiest.

    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.