Convert OBJ to GLTF Online (Free & Secure)
To convert OBJ to glTF, drop your .obj file on this page and download a .gltf file seconds later. The route is OBJ → GLB → glTF (parsed into a GLB scene, then exported as glTF), and geometry and materials are carried across where glTF allows.
Select .OBJ file
or drag & drop .obj file here
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⚡ AI Summary & Quick Answer
To convert OBJ to glTF, drop your .obj file on this page and download a .gltf file seconds later. The route is OBJ → GLB → glTF (parsed into a GLB scene, then exported as glTF), and geometry and materials are carried across where glTF allows.
Legacy and DCC formats are heavy and awkward on the web; converting them gives you a compact asset that loads in any modern browser. OBJ (.obj) is plain ASCII text with a companion .mtl material file. It holds polygons (triangles, quads and n-gons) with shared UV and normal pools and is most often opened in Blender, Maya, and 3ds Max. glTF (.gltf) is a JSON scene description that references separate .bin and image files, holding indexed triangle meshes with optional morph targets and skins, and is typically used in Blender, Visual Studio Code glTF tools, and three.js.
Under the hood, the OBJ file is decoded into an in-memory scene, then serialised as glTF. The axis convention moves from conventionally Y-up, but not enforced to Y-up, right-handed. Everything runs in your browser or an isolated, auto-purged instance, so models stay private.
.objAbout OBJ (Wavefront)
Universal geometry definition format supported by almost every 3D modeling and rendering software.
- Structure: plain ASCII text with a companion .mtl material file
- Materials: Phong-style MTL materials (diffuse, specular, ambient)
- Units: unitless (the importing application decides the scale)
- Axis: conventionally Y-up, but not enforced
- Opens in: Blender, Maya, 3ds Max, ZBrush or MeshLab
.gltfTarget format: glTF (JSON)
Standard open-source 3D scene description format using JSON with external or embedded buffers and textures.
- Structure: a JSON scene description that references separate .bin and image files
- Materials: PBR metallic-roughness materials
- Units: meters (fixed by the glTF specification)
- Axis: Y-up, right-handed
- Opens in: Blender, Cesium, three.js or any glTF 2.0 viewer
What happens to your data in OBJ → glTF conversion
Conversion route: OBJ → GLB → glTF (parsed into a GLB scene, then exported as glTF).
| Aspect | Result | Outcome |
|---|---|---|
| Geometry | Preserved | OBJ stores polygons (triangles, quads and n-gons) with shared UV and normal pools; glTF stores indexed triangle meshes with optional morph targets and skins. Surfaces are retriangulated where needed and positions, normals and UV coordinates are carried across. |
| Materials | Preserved | OBJ uses Phong-style MTL materials (diffuse, specular, ambient) and glTF can represent the same information, so base colour and surface settings are preserved. |
| Textures | Preserved | In OBJ, texture images are referenced by file name from the MTL file. glTF can reference or embed textures too, so images and UV mapping stay linked. |
| Vertex colours | Preserved | Per-vertex colours in OBJ are written to glTF as vertex colour data. |
| Animation | Not applicable | OBJ is a static format, so the glTF result is a single static pose. |
| Units & scale | Adapted | OBJ uses unitless (the importing application decides the scale); glTF uses meters (fixed by the glTF specification). Check the scale in your target application, and use the Scale tool if the model looks too big or too small. |
| Orientation | Adapted | OBJ is conventionally Y-up, but not enforced and glTF is Y-up, right-handed. The converter writes a consistent orientation, but verify the up axis in your target software. |
Expect the glTF file to be roughly 3.3x smaller than the OBJ source, since glTF is similar to GLB, but split across several files.
Why convert OBJ to glTF?
Why leave OBJ
People most often convert from OBJ when they are rescuing an old sculpt or archive from a text-based format. Other common cases include moving a model out of ZBrush or Blender into a web pipeline and turning a vendor download into a modern, textured asset. In OBJ → glTF specifically, preserved: geometry, materials, textures, and vertex colours; adapted: units & scale and orientation. Expect the glTF file to be roughly 3.3x smaller than the OBJ source, since glTF is similar to GLB, but split across several files.
Why choose glTF
glTF is the right target when you are debugging materials and node hierarchies. It also fits scenarios such as keeping a human-readable scene you can diff in version control and feeding pipelines that expect separate buffers. Legacy and DCC formats are heavy and awkward on the web; converting them gives you a compact asset that loads in any modern browser.
Where the result opens
After conversion you can open the .gltf file in Blender, Cesium, three.js or any glTF 2.0 viewer.
Step-by-Step Guide: OBJ → glTF
- 1
Upload your .obj file
Drag your OBJ model onto the converter or click to browse. Texture images are referenced by file name from the MTL file; zip the model with its textures and companion files if you want them included.
- 2
Check your free quota
Free accounts can run a few conversions per day; signing in unlocks tracking of your remaining uses. No watermark is ever added.
- 3
Convert to glTF
Press the Convert to glTF button. The pipeline follows OBJ → GLB → glTF (parsed into a GLB scene, then exported as glTF), which usually takes a few seconds for models under 100 MB.
- 4
Download the .gltf file
Your glTF file downloads automatically. Open it in Blender and Visual Studio Code glTF tools to confirm scale and orientation.
Tips for OBJ → glTF
- No unit information means scale surprises between applications (OBJ source).
- Relative paths to .bin and texture files break when the files are separated (glTF target).
- Always verify real-world size: OBJ is unitless (the importing application decides the scale), while glTF is meters (fixed by the glTF specification).
- Since OBJ is much heavier than glTF, converting is also a good way to shrink your asset.
Frequently Asked Questions
How do I convert OBJ to glTF without losing quality?
Upload the .obj file and press convert; the route is OBJ → GLB → glTF (parsed into a GLB scene, then exported as glTF). Geometry is carried over exactly; materials are preserved, and textures stay linked through UV coordinates.
Does OBJ to glTF conversion keep textures?
In OBJ, texture images are referenced by file name from the MTL file. glTF can reference or embed textures too, so images and UV mapping stay linked.
Why does my glTF model look the wrong size or rotation?
OBJ uses unitless (the importing application decides the scale); glTF uses meters (fixed by the glTF specification). Check the scale in your target application, and use the Scale tool if the model looks too big or too small. OBJ is conventionally Y-up, but not enforced and glTF is Y-up, right-handed. The converter writes a consistent orientation, but verify the up axis in your target software.
Will the glTF file be bigger or smaller than my OBJ file?
Expect the glTF file to be roughly 3.3x smaller than the OBJ source, since glTF is similar to GLB, but split across several files.
What software can open the converted glTF file?
glTF files open in Blender, Cesium, three.js or any glTF 2.0 viewer. If you need to go back, use the glTF to OBJ converter.
Is it safe to upload my OBJ model?
Yes. Files are processed in your browser or on isolated instances and purged right after conversion. They are never used to train AI models, and no watermark is added.