OBJ to GLB Converter

Pack an OBJ, its .mtl and its textures into one GLB for the web, AR or a game engine. Drop the folder or a .zip and get a single file back.

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

Drop an OBJ 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 OBJ to GLB

    1. Drop your OBJ files

      Drop the .obj with its .mtl and texture images, 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 OBJ 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 face is kept; quads and n-gons are split into triangles.
    Color Kept: materials, textures and vertex colors are embedded.
    Units OBJ has bare numbers, so they pass through as metres: 1 unit becomes 1 metre. If the preview size is wrong, set the file units.
    Orientation Both are Y up, so it stays the right way up.
    Objects Each part stays a separate object or mesh.

    OBJ to GLB: what actually happens

    An OBJ with textures is at least three files that break if one goes missing. A GLB is one. The converter reads the .obj, follows its .mtl to the texture images, and writes a single GLB with every material and texture embedded.

    OBJ has no units, so the numbers pass straight into glTF's metres: a model built in Blender (1 unit = 1 m) stays the same size. If your OBJ was made in millimetres for printing, set the file units to millimetres and it shrinks to real size. OBJ's Y up already matches glTF.

    OBJ at a glance

    Wavefront OBJ · .obj

    Stores
    Vertices, faces (triangles, quads, n-gons), UVs and normals as text
    Color
    Materials and textures in a separate .mtl file; vertex colors as an unofficial extension
    Units
    None, the numbers are bare
    Up axis
    Y by convention (Blender, Maya, most 3D apps)
    File size
    Text: about a binary STL's size for bare geometry, up to twice that with UVs and normals
    Opens in
    Blender, Maya, 3ds Max, ZBrush, Cinema 4D, game engines, most slicers

    OBJ came out of Wavefront Technologies' animation software and became the plain-text lingua franca of 3D. The geometry is in the .obj; colors and texture references live in a companion .mtl file, which is why OBJs so often arrive grey.

    Open OBJ 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 OBJ to GLB

    Drop everything

    Drop the .obj, .mtl and images together, or a .zip, so the textures make it into the GLB.

    Check the preview

    If the preview is grey, the converter didn't get the .mtl or textures; the note says which file is missing.

    Lighter files

    Run the GLB through Draco or Meshopt compression for the web.

    OBJ to GLB FAQ

    Does OBJ to GLB keep textures?
    Yes, as long as you drop the .mtl and texture images (or a .zip) with the .obj. They are embedded in the GLB.

    Why is my GLB 1000 times too big?
    Your OBJ was in millimetres, but OBJ has no units, so 50 became 50 m. Set the file units to millimetres and convert again.

    Can I convert OBJ to glTF instead?
    Yes: pick glTF as the output for a JSON file with the data embedded.

    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.