twineconvert

free · in-browser · no upload

OBJ to GLB
Converter

Drop your OBJ file. We'll convert it to GLB 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 .obj

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 OBJ 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 GLB 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 OBJ → GLB

What this conversion is actually for

OBJ is the de-facto legacy DCC interchange (Maya, 3ds Max, Blender, ZBrush all read it) but it's text-based, lacks compression, and has no scene graph. GLB is the modern web/AR/VR replacement. Converting OBJ to GLB shrinks file size, gains binary streaming, and gets you into the modern 3D pipeline (model-viewer, Sketchfab, WebXR, USDZ via gltf2usd).

A real example

Your sculptor delivers final asset as `character.obj`. You need it on a Next.js product page rendered via `<model-viewer>`. Convert to `character.glb`, drop in `public/`, reference in the component. 10x smaller than the OBJ source after binary packing, loads in 200ms on a typical connection.

Troubleshooting

UVs and texture from my OBJ don't appear in the GLB.

Our OBJ→GLB converter currently emits only vertex positions and faces. UVs (vt lines), normals (vn), and material references (mtllib + usemtl) are dropped. For textured models, open the .obj in Blender → File → Import → Wavefront .obj (with `Image Search` enabled to find the .mtl + textures) → File → Export → glTF .glb. That round-trip preserves materials.

Faces look inverted (interior of the model is visible).

OBJ winding-order convention varies between exporters. If your model came out inside-out, open in Blender → Edit Mode → Select All → Mesh → Normals → Recalculate Outside (Shift-N) → re-export to OBJ → re-run.

Formats involved

About OBJ and GLB

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 →
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 →

Related tools

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FAQ

Common questions

Is this OBJ → GLB 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 OBJ to GLB?

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

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

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

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.