OBJ Converter

How to Convert OBJ to Any Format

1. Choose Your OBJ File: Click "Choose 3D file" and select your .obj model. A 3D preview window renders the mesh directly in the page so you can confirm it loaded before converting; the tool reads the single .obj geometry file.
2. Pick an Output Format: Open the "To format" dropdown and choose your target — GLB, glTF, STL, PLY, or 3MF. GLB is selected by default because it packs the whole model into one self-contained binary file.
3. Check the Preview, Then Convert: Spin the model in the preview to confirm orientation and that the geometry is intact. OBJ-to-mesh conversion is geometry-focused, so there are no codec or quality sliders — the mesh is rewritten into the target format as-is.
4. Convert and Download: Click "Convert" and save the result with the Download button. The conversion runs entirely in your browser using three.js loaders and exporters — your model never leaves your device, with 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 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 first developed by Wavefront Technologies for its Advanced Visualizer animation package in the late 1980s, and it remains one of the most universally supported 3D formats. It is a plain-text (ASCII) format that stores geometry: vertex positions, texture coordinates, vertex normals, and the faces that connect them, where each face can be a triangle, a quad, or a larger polygon. That simplicity is its strength and its limitation. OBJ has no scene graph and no animation, and it stores no textures inline — 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 texture images) are awkward to move and easy to break. Converting consolidates or retargets the geometry 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 published 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 (created for 3D Systems in 1987) is the long-standing default but carries geometry only. 3MF — published by the 3MF Consortium since 2015 and standardized as ISO/IEC 25422:2025 — is the modern replacement that can also carry color, multiple materials, and print metadata 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 Format at a Glance

OBJ vs. Common 3D Conversion Targets

Frequently Asked Questions

Will my OBJ materials and textures carry over when I convert?

This converter works from the .obj geometry file alone, so the mesh — vertices, UVs, and normals — transfers, but surface colors and texture maps do not. OBJ keeps its look in a separate .mtl file that points to external image textures, and those companion files aren't part of the conversion here. If you need materials and textures to travel with the model, load the full .obj + .mtl + image set in a desktop tool such as Blender and export to GLB or glTF from there. Converting to STL drops color and UVs by design; PLY keeps per-vertex color but not texture-image maps.

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 any 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, standardized as ISO/IEC 25422:2025, 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. If you have an STL and want to go the other way, our STL to OBJ converter turns it back into an editable OBJ mesh.

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 and n-gon faces are 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 self-contained binary that carried the mesh — vertices, faces, and normals — intact, while the material and texture data that lives in a separate .mtl did not travel.

What software opens an OBJ file?

OBJ is one of the most widely supported 3D formats: Blender, Autodesk Maya and 3ds Max, Cinema 4D, ZBrush, and MeshLab import it directly, and both Windows and macOS can preview it. Because it stores only geometry, some of those apps won't show the intended surface look unless the .mtl file and its textures sit alongside the .obj. If your destination is a printer, a web viewer, or a game engine rather than a modeling app, converting to STL, GLB, or glTF is usually smoother than opening the raw .obj.

Is OBJ a compressed or lossy format?

Neither — OBJ is uncompressed plain text. Every vertex coordinate is written out as human-readable numbers, which makes .obj files easy to inspect and edit but larger than binary formats for the same mesh. Because it stores exact coordinates rather than re-encoding them, moving geometry in and out of OBJ does not degrade the mesh the way a lossy image or video codec would. Converting to a binary target like GLB, or a zipped package like 3MF, typically produces a much smaller file for the same model.

Do OBJ vertex normals and smoothing carry across?

Vertex normals written directly in the .obj (the vn lines) transfer with the geometry. Smoothing-group information and non-triangular faces are handled per target: STL is triangle-only, so quads and n-gons are triangulated and smoothing groups are baked into flat facets. GLB and glTF keep normals and preserve the mesh topology more faithfully, which is one reason a converted GLB looks better for shaded viewing than an STL of the same model.

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.