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How to Convert OBJ to GLTF
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When Do You Need to Convert OBJ to GLTF?
glTF is the format for showing 3D on the web and in modern viewers, and OBJ is what most older tools export. Converting OBJ to glTF is the step before putting a model on a web page, into an AR viewer, or into an engine that expects a modern asset.
What Happens When You Convert OBJ to GLTF
Assimp reads the OBJ along with its MTL material file and writes glTF. This is a step up in what the file can carry: glTF holds materials, textures and a scene graph in a single well defined structure, where OBJ relies on a companion file and loose texture references. Geometry and UV coordinates come across. Materials are translated to glTF's physically based model, which does not map exactly from OBJ's older lighting model, so appearance can shift and may need adjusting.
Worth knowing before you convert
An OBJ with missing or mislinked texture files converts to a glTF with missing textures. Check the MTL references before converting.
About OBJ and GLTF
model/obj
OBJ is a geometry definition file format.
model/gltf+json
glTF is a file format for 3D scenes using JSON.
Conversion Notes
3D conversion from OBJ to GLTF preserves mesh geometry, but features like rigging, blend shapes, physics constraints, or procedural modifiers may not transfer if the target format doesn't support them. Material definitions are mapped to the closest equivalent — PBR textures are preserved where the target format supports them, otherwise a best-effort approximation is applied.
Frequently Asked Questions
Material definitions convert, but the image files are referenced rather than invented. Keep the texture files alongside the OBJ so they can be found.