Free online OBJ to GLTF converter

Web viewers, game engines, and many real-time applications commonly require glTF rather than OBJ. Converting the model to a binary .glb file packages geometry and supported assets into a format that loads efficiently without installing software on 101convert.com.

What the OBJ format is

OBJ is a text-based 3D geometry format created by Wavefront Technologies. It stores vertex positions, texture coordinates, surface normals, polygon faces, and references to materials in a separate .mtl file. Texture images, commonly PNG or JPEG, remain separate from both files.

Blender, Autodesk Maya, 3ds Max, MeshLab, SketchUp, CAD applications, and 3D scanning tools use OBJ for exchanging static meshes. OBJ is suitable for modeling, sculpting, scanning, and asset libraries, but the format does not natively store animation, rigging, scene hierarchy, cameras, or a complete physically based material definition.

What the glTF format is

glTF 2.0 is a Khronos Group format designed for real-time 3D delivery in browsers, applications, augmented reality, and game engines. It can store meshes, node hierarchies, cameras, animations, skinning, UV coordinates, normals, and physically based rendering materials.

A .gltf file is a JSON description that commonly references a .bin buffer and separate texture files. A .glb file is a binary container that can package the scene, geometry, and textures into one file. GLB is usually easier to distribute and less prone to broken relative texture paths, while separate glTF files can be more convenient when assets must remain independently editable or cached.

How to convert OBJ to glTF with Blender

1. Place the .obj, matching .mtl, and all referenced texture images in a known folder. Keep the filenames and relative paths unchanged.
2. Open Blender and choose File → Import → Wavefront (.obj). Select the OBJ file and import it.
3. Inspect the imported mesh. Check its scale, orientation, UV mapping, normals, object hierarchy, and material assignments. Use Material Preview or Rendered view to confirm that textures are visible.
4. Select the objects to export, then choose File → Export → glTF 2.0 (.glb/.gltf).
5. Set the export format to GLB for one self-contained file. Choose a glTF variant that writes a .gltf, .bin, and separate texture files when the receiving application specifically requires them.
6. Enable Selected Objects when the Blender scene contains unrelated objects. Set any required transform, mesh, material, and animation options, then click Export glTF 2.0.

For a conversion without installed software, upload the OBJ file to the free converter on 101convert.com and download the resulting glTF or GLB file. If the model depends on an MTL file or external textures, provide those assets when the converter accepts accompanying files; otherwise, the output may lack materials or images.

Quality and compatibility limitations

An OBJ conversion cannot create animation, rigging, hierarchy, cameras, or material data that the source does not contain. A static OBJ normally produces a static glTF scene. Material properties from MTL, such as specular highlights, transparency, and illumination settings, do not map exactly to glTF’s PBR model and may require manual adjustment.

Missing or incorrectly referenced .mtl and texture files commonly produce an untextured result. Check image formats, UV coordinates, and color settings after import. Inspect normals because reversed normals can cause dark or invisible surfaces. Non-manifold geometry, duplicate vertices, very large coordinates, unsupported texture formats, and complex polygon faces can also cause shading or loading problems.

Triangulate the mesh only when the target engine requires predictable triangles; otherwise, let the receiving application handle compatible polygons. Test the exported file in the intended browser, engine, or glTF viewer, and verify that texture paths and material appearance remain correct after moving the output file.