Free Online OBJ to glTF Converter
Convert OBJ to glTF for web 3D development. Human-readable JSON format with PBR materials. Free, fast, no sign-up.
How to Convert OBJ to glTF
Upload Your OBJ File
Drag and drop your .obj file onto the converter above. Include .mtl material file if available for texture support.
Automatic Conversion
The converter transforms OBJ geometry and MTL materials into glTF format with JSON scene description and binary geometry data.
Download Your glTF
Once complete, download your glTF files (.gltf + .bin + textures) and use them in web 3D development and debugging.
Why Choose Our Converter
Free & No Sign-Up
Convert OBJ to glTF for free with no registration, no watermarks, and no hidden costs.
Debuggable JSON Format
Unlike binary GLB, glTF uses human-readable JSON for scene structure. Perfect for development, debugging, and pipeline customization.
MTL Material Transfer
Materials from companion .mtl files are converted to glTF material format with base color, metallic, and roughness properties.
Web 3D Standard
glTF is the Khronos Group open standard for web 3D. The output works in Three.js, Babylon.js, CesiumJS, and Google Model Viewer.
2 Ways to Convert OBJ to glTF
Online OBJ to glTF Converter (This Tool)
Best for: quick conversion
- Drag and drop your .obj file.
- Wait for the automatic conversion.
- Download the glTF files.
Pros: Free, no software install, works on any device.
Cons: Requires internet. glTF is multi-file format (.gltf + .bin + textures).
CesiumJS obj2gltf (Command Line)
Best for: developers and pipelines
- Install Node.js on your computer.
- Run: npx obj2gltf -i model.obj -o model.gltf.
- The tool generates .gltf with embedded geometry.
Pros: Free, open-source by CesiumJS. Batch processing. Programmatic control.
Cons: Requires Node.js and command line knowledge.
Quick Checks Before You Convert
Include MTL for Materials
Without the .mtl companion file, the glTF output will have default grey materials. Upload both .obj and .mtl together for textured output.
glTF vs GLB Output
glTF produces separate files (.gltf JSON + .bin geometry + texture images). GLB bundles everything into one binary file. Use glTF for development; use GLB for production deployment.
Texture File Paths
MTL files reference textures by file path. Ensure paths are relative and textures are accessible. Missing textures produce untextured glTF output.
UV Coordinates
glTF uses UV mapping for textures. OBJ files without UV coordinates will produce glTF models that cannot display textures correctly.
Fixing Common Issues After Conversion
glTF has no textures
The MTL file or textures were missing. Include the .mtl and all texture image files when uploading. Alternatively use obj2gltf CLI tool with the -t flag to check for texture references.
Model appears dark in web viewer
glTF uses PBR materials. OBJ/MTL diffuse materials may convert differently. Adjust material properties (metallic, roughness) in the glTF JSON or use Blender for material editing.
Multiple files are hard to manage
glTF outputs separate .gltf + .bin + texture files. For production deployment, convert to GLB instead (single binary file). Use glTF only during development and debugging.
Normals appear inverted
Some OBJ exporters flip normals. Check the glTF in a viewer and compare with the original OBJ. Use Blender to recalculate normals (Ctrl+N) before exporting.
Frequently Asked Questions
How do I convert OBJ to glTF?
Upload your .obj file using the converter above. Include the .mtl file for materials. The tool converts to glTF format. Download the output files when complete.
Is this OBJ to glTF converter free?
Yes, completely free. No registration, no watermarks, no hidden costs.
What is the difference between glTF and GLB?
glTF is a multi-file format: a .gltf JSON file describing the scene, a .bin binary file with geometry, and separate texture images. GLB bundles all of these into one compact binary file. Use glTF for development; use GLB for production.
How do I convert OBJ to glTF using obj2gltf?
Install Node.js, then run: npx obj2gltf -i model.obj -o model.gltf. The CesiumJS obj2gltf tool is a free, open-source command-line converter that handles OBJ to glTF conversion with material support.
Does converting OBJ to glTF preserve textures?
If the OBJ has a companion .mtl file with texture references and the texture images are available, they will be included in the glTF output. The glTF references textures as separate files or embedded as base64.
OBJ vs glTF: which is better?
glTF is far better for web 3D. It supports PBR materials, is optimized for real-time rendering, and has native browser support via Three.js and Babylon.js. OBJ is a legacy interchange format without modern material support.
Can I convert OBJ to glTF in Blender?
Yes. In Blender, go to File > Import > Wavefront (.obj). Then go to File > Export > glTF 2.0 (.glb/.gltf). Select .gltf format and click Export.
What is glTF format?
glTF (GL Transmission Format) is the royalty-free open standard for 3D content on the web, maintained by the Khronos Group. Often called the "JPEG of 3D," it supports PBR materials, animations, and is natively supported by modern web browsers and 3D engines.
Can I convert OBJ to glTF on Mac?
Yes. Our online converter works in any browser on macOS. Alternatively, install Node.js and use obj2gltf, or use Blender on Mac.
Why use glTF instead of OBJ for web?
glTF supports modern PBR materials (metallic-roughness workflow), is optimized for GPU loading, and is the web 3D standard. OBJ lacks modern material support, requires multiple files, and is not optimized for web rendering performance.