OBJ Converter

How to Convert OBJ to Any Format

1. Upload Your OBJ File: Drag and drop your .obj model or click "Choose 3D file". The converter reads Wavefront OBJ geometry directly in the page; a 3D preview window lets you confirm the mesh loaded before you convert.
2. Pick an Output Format: Use the output-format dropdown to choose your target — GLB, glTF, STL, PLY, or 3MF. GLB is selected by default because it packs the whole model into one self-contained file.
3. Check the Preview, Then Convert: Spin the model in the preview to confirm orientation and that the geometry is intact. OBJ-to-3D conversion is geometry-focused, so there are no codec or quality sliders to set — the mesh is rewritten into the target format as-is.
4. Convert and Download: Click Convert and save the result. The conversion runs entirely in your browser using three.js loaders and exporters — your model never leaves your device, and there is no sign-up and no watermark.

Popular OBJ Conversions

• OBJ to GLB — one self-contained binary file for web, AR, and game engines
• OBJ to glTF — the JSON-based "JPEG of 3D" for runtime and Three.js scenes
• OBJ to STL — a watertight triangle mesh ready for slicers and 3D printing
• OBJ to PLY — for scan, point-cloud, and research tooling that expects PLY
• OBJ to 3MF — the modern, color-aware 3D-printing container that supersedes STL

Why Convert an OBJ File?

Wavefront OBJ was created by Wavefront Technologies for its Advanced Visualizer software in the late 1980s, and it remains one of the most universally supported 3D formats. It is a plain ASCII text format that stores geometry only: vertex positions, texture coordinates, vertex normals, and the faces that connect them. That simplicity is its strength and its limitation. OBJ has no scene graph, no animation, and no embedded textures — material definitions live in a separate companion .mtl file, which in turn points to external image files.

That split is exactly why people convert away from OBJ. The moment a model has to ship somewhere — a website, an AR viewer, a game engine, or a 3D printer — three loose files (.obj, .mtl, and the textures) are awkward to move and easy to break. Converting consolidates or retargets the data into the format the destination actually speaks:

• For the web, AR, and game engines (GLB / glTF): glTF 2.0, maintained by the Khronos Group and recognized as ISO/IEC 12113:2022, was designed for runtime delivery. A .glb packs the mesh, physically-based materials, textures, and any animation into a single binary file — ideal for <model-viewer>, WebXR, Unity, Unreal, and Three.js. The .gltf variant keeps that data as readable JSON for editing and debugging.
• For 3D printing (STL / 3MF): Slicers expect a watertight triangle mesh. STL (invented for 3D Systems in 1987) is the long-standing default but carries geometry only. 3MF — published by the 3MF Consortium since 2015 — is the modern replacement that can also carry color and multiple materials in one package.
• For 3D scanning and research (PLY): PLY, developed at Stanford around 1994, is built around per-vertex attributes like color, normals, and confidence values, which is why scanner and point-cloud pipelines prefer it.

OBJ vs. Common 3D Conversion Targets

Frequently Asked Questions

Will my OBJ materials and textures survive the conversion?

It depends on the target and on whether the source data travels with the file. OBJ stores its look in a separate .mtl file that references external image textures; if those companion files are present and correctly referenced, a conversion to GLB or glTF can embed materials and textures into the single output file. Converting to STL drops all color, UVs, and materials by design — STL is a geometry-only format. PLY keeps per-vertex color but not texture-image maps. If your model is a bare .obj with no .mtl or images, there is no material data to carry over regardless of the target.

What is the difference between GLB and glTF when I convert from OBJ?

Both are glTF 2.0; the difference is packaging. A .gltf file is human-readable JSON that describes the scene and usually references geometry buffers and textures as separate external files. A .glb packs all of that — JSON, binary mesh data, and textures — into one self-contained binary file. For shipping a finished model to a website, AR viewer, or game engine, GLB is the simpler choice because it is a single portable file; glTF is handy when you want to inspect or hand-edit the scene description.

Should I convert OBJ to STL or to 3MF for 3D printing?

Both produce a printable mesh, but they differ in what they carry. STL (the 1987 stereolithography format) is geometry only and is supported by virtually every slicer, which makes it the safe default for a single-material print. 3MF, published by the 3MF Consortium since 2015, is an XML-and-ZIP package that can store color, multiple materials, and print metadata in one file — a better fit for multi-material or color printing on slicers and printers that support it.

Why convert OBJ to GLB for AR or the web?

Web and AR runtimes are built around glTF. A .glb is a single binary that embeds geometry, PBR materials, and textures, so it loads cleanly in <model-viewer>, WebXR, Three.js, Unity, and Unreal without the loose .mtl and image files an OBJ depends on. That single-file portability — plus glTF being designed specifically for efficient runtime loading — is why most AR frameworks and 3D web embeds expect GLB rather than OBJ.

Does converting OBJ to another mesh format change the geometry?

For mesh-to-mesh conversions the vertices and faces are rewritten faithfully, so the shape is preserved. What can change is the surrounding data: quad faces are typically triangulated for formats like STL, smoothing-group and material information may not map onto a format that has no concept of it, and STL specifically discards UVs and color. In our testing, converting an OBJ to GLB produced a single binary file containing the same mesh as the source rather than the three separate files (.obj, .mtl, and texture images) the original needed.

Is my 3D model uploaded to a server when I convert it?

No. OBJ conversion on this page runs entirely in your browser using three.js loaders and exporters — the file is parsed, converted, and downloaded on your own device, so the model never leaves your computer. That means no upload wait, no account, and no watermark; it also means very large meshes are bounded by your browser's available memory rather than an upload limit.