twineconvert

free · in-browser · no upload

GLB to OBJ
Converter

Drop your GLB file. We'll convert it to OBJ right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .glb

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a GLB from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your OBJ the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Why convert GLB → OBJ

What this conversion is actually for

Some 3D pipelines (older renderers, legacy CAM software, certain academic toolchains) still require OBJ. Converting GLB to OBJ extracts the mesh as plain ASCII text that any DCC tool from the last 30 years can read. Useful when you have a modern GLB but need to feed a legacy workflow.

A real example

Your downstream renderer is an ancient academic raytracer that only reads Wavefront OBJ. The mesh you have is `scene.glb` from a recent Blender export. Convert here, get `scene.obj`, pipe into the renderer. Done.

Troubleshooting

The OBJ has no texture coordinates (vt lines).

Same limitation as the reverse direction — we currently emit only positions and faces from the GLB's first primitive. Open in Blender if you need the UVs back: Import GLB → Export OBJ with default settings (which include `vt` and `vn` lines).

Formats involved

About GLB and OBJ

GLB, glTF 2.0 Binary

GLB is the binary container for glTF 2.0 — the Khronos Group's web-native 3D format, often called "the JPEG of 3D." A single .glb file packs the model's JSON metadata (scene graph, materials, animations) and binary buffers (vertex positions, normals, UVs, indices, textures) into one self-contained download, ideal for streaming over HTTP. Universal support across the modern 3D stack: Three.js, Babylon.js, model-viewer (Google's `<model-viewer>` web component), Sketchfab, Facebook 3D posts, Microsoft 3D Viewer, Apple QuickLook (via USDZ conversion), Blender (import/export), Unreal Engine, Unity. Every WebXR/AR/VR pipeline reads GLB. Spec finalized in 2017 as glTF 2.0; binary chunk format kept stable since.

How to open

Drag-and-drop into https://gltf-viewer.donmccurdy.com or https://sandbox.babylonjs.com/. Blender opens .glb via File → Import → glTF 2.0. The `<model-viewer>` web component renders them on any webpage with `<model-viewer src="model.glb">`. Microsoft 3D Viewer (Windows) and macOS Preview (with USDZ Tools) handle GLB natively.

Full GLB format guide →
OBJ, Wavefront Object

OBJ is Wavefront's text-based 3D mesh format from 1990, the most-used asset interchange in computer graphics for decades. Plain text: "v" lines for vertices, "f" for faces, "vn" for normals, "vt" for texture coordinates. Optional companion .mtl file describes materials. Universal compatibility across 3D software but lacks newer features like PBR materials, animations, and skeletons.

How to open

Blender, Maya, 3ds Max, Cinema 4D, ZBrush, Modo, MeshLab, every 3D software ever. Plain text in any editor.

Full OBJ format guide →

Related tools

Convert other files to OBJ

Convert your GLB to other formats

FAQ

Common questions

Is this GLB → OBJ converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert GLB to OBJ?

3D model delivery for the web (AR product viewers, WebXR scenes, embedded 3D widgets) and modern game-engine workflows. 3D mesh interchange between modeling/rendering applications. The most common reason to convert is compatibility, OBJ works in places where GLB doesn't, or vice versa.

How do I open a GLB file in the first place?

Drag-and-drop into https://gltf-viewer.donmccurdy.com or https://sandbox.babylonjs.com/. Blender opens .glb via File → Import → glTF 2.0. The `<model-viewer>` web component renders them on any webpage with `<model-viewer src="model.glb">`. Microsoft 3D Viewer (Windows) and macOS Preview (with USDZ Tools) handle GLB natively.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.