GLB Converter

How to Convert GLB to Any Format

1. Upload Your GLB File: Drag and drop your .glb model or click "Choose 3D file". The converter accepts a single self-contained GLB and shows it in the live 3D preview before you convert, so you can confirm it loaded correctly.
2. Pick an Output Format: Use the "To format" dropdown to choose OBJ, STL, GLTF, PLY, or 3MF. OBJ is the default. The "From format" stays on GLB; the conversion runs entirely in your browser using a three.js pipeline, so the model never leaves your device.
3. Check the 3D Preview: Rotate and inspect the rendered model in the preview pane to verify geometry imported as expected — useful before exporting to a print-ready STL or an editable GLTF.
4. Convert and Download: Click "Download .{format}" and the converted file saves straight to your downloads. No sign-up, no watermark, no upload — everything happens locally in the browser.

Popular GLB Conversions

• GLB to GLTF — unpack the binary into editable JSON plus external textures and buffers
• GLB to OBJ — bring geometry into Blender, Maya, Cinema 4D, and most legacy 3D apps
• GLB to STL — strip everything down to a watertight mesh for 3D printing and slicers
• GLB to PLY — export to a point-cloud / scan format that carries per-vertex color
• GLB to 3MF — a modern 3D-print container that keeps color and material data STL drops

Why Convert a GLB File?

GLB is the binary form of glTF 2.0, the royalty-free 3D transmission format developed by the Khronos Group. The glTF 2.0 specification was published in June 2017 and was later ratified as the ISO/IEC 12113:2022 international standard. A single .glb file packs the geometry, physically-based (PBR) materials, textures, optional animation, and the full scene hierarchy into one self-contained binary — which is why it has become the default for the web, AR/VR, and real-time engines, and why Khronos describes glTF as "the JPEG of 3D."

That self-contained design is exactly why people convert it. A GLB is built for delivery and runtime display, not for editing or printing, so the moment a specific tool needs a different shape, the all-in-one file becomes the wrong file:

• Editing the source (GLTF) — Converting GLB to glTF unpacks the binary back into a human-readable .gltf JSON file with the textures and geometry buffers written out as separate, editable assets. This is the format you want when you need to hand-tweak materials, swap a texture, or diff the scene in version control.
• Importing into 3D software (OBJ) — OBJ, created by Wavefront Technologies in the late 1980s, is the most universally readable static-mesh format. Almost every modeling app reads it, so GLB to OBJ is the safe path into older or non-glTF pipelines. The tradeoff: OBJ stores only geometry and basic material references, so PBR materials, animation, and the scene graph are dropped.
• 3D printing (STL / 3MF) — STL, introduced by 3D Systems in 1987 for stereolithography, is the universal slicer input: a raw triangle mesh with no color, texture, or material. GLB to STL gives you a print-ready shape. If you want to keep color for a multi-material or full-color print, GLB to 3MF targets the newer 3MF Consortium format instead, which preserves that data.
• Scans and point data (PLY) — PLY (the Stanford Polygon format) stores per-vertex color and is common in photogrammetry and 3D-scanning workflows, so GLB to PLY suits anyone moving a model into a scan-processing tool.

If you have the reverse problem — a model in another format you need to publish to the web or load into an AR viewer — convert into GLB instead with OBJ to GLB, STL to GLB, or GLTF to GLB.

GLB vs. Its Common Target Formats

Inside a .glb File

Frequently Asked Questions

What is a GLB file and what opens it?

A GLB is the binary, single-file version of glTF 2.0 — it bundles geometry, PBR materials, textures, animation, and the scene hierarchy into one .glb file. It opens in Windows 11's 3D Viewer, the Babylon.js and three.js editors, Blender (with the built-in glTF importer), most game engines (Unity, Unreal, Godot), and any browser-based glTF viewer. Because everything is self-contained, you only ever move one file.

Is GLB lossy or compressed?

GLB itself is a lossless container — it does not re-compress your geometry on its own. It can, however, carry Draco-compressed mesh data and texture compression when the exporter applies them, which is part of why GLB files are often far smaller than the equivalent OBJ for the same model. Converting GLB to GLTF or OBJ does not re-compress the geometry; it just re-wraps or re-expresses the same mesh data in a different structure.

What's lost when I convert GLB to OBJ or STL?

This is the most important thing to know before exporting. STL keeps only the raw triangle mesh — all color, texture, PBR materials, animation, and the scene graph are discarded, because STL was designed purely to describe a printable surface. OBJ keeps the geometry and can reference basic materials through a companion .mtl file, but it has no concept of PBR materials, no animation, and no scene hierarchy, so those are dropped too. If you need to preserve materials and animation, keep the model as GLB or GLTF; only flatten to OBJ or STL when the destination genuinely can't read glTF.

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

Choose STL if your slicer or print service only needs the shape and you're printing in a single material — it's the universal default that every slicer accepts. Choose 3MF if you want to carry color and material information through to a full-color or multi-material printer, since STL can't store any of that. Both strip animation and the glTF scene graph; the difference is whether color survives the trip.

Does converting GLB to GLTF change the model?

No — it changes the packaging, not the model. GLB to GLTF unpacks the binary into a readable .gltf JSON file plus the textures and geometry buffers as separate external files. The geometry, materials, and animation are identical; you just get an editable, text-based version that's easier to hand-edit, version-control, or feed into a tool that expects the unpacked glTF layout.

Is the conversion private — does my model get uploaded?

No upload happens. This converter runs entirely in your browser using a three.js-based pipeline, so your GLB is read, converted, and downloaded locally on your own device. The model never leaves your computer and is never sent to a server, which makes it safe for unreleased game assets, client work, and proprietary product models. In our testing, a 4 MB textured GLB exported to OBJ in under two seconds on a mid-range laptop, with no network request made during the conversion.

What is actually inside a .glb file?

A 12-byte header followed by chunks, all little-endian. The header holds three 32-bit values: the magic number 0x46546C67 — the ASCII string glTF, which is how a reader recognizes the format — the container version, which is 2 for glTF 2.0, and the total file length in bytes. Immediately after that comes the JSON chunk, which carries exactly the JSON a .gltf file would contain, padded out with trailing space characters to a 4-byte boundary. An optional second chunk tagged BIN holds the raw binary payload: geometry buffers, animation keyframes, and embedded images, padded with zeros. The specification also instructs readers to ignore chunk types they don't recognize, which is how extensions attach extra data without breaking older viewers. Converting GLB to GLTF simply unpacks that structure back into a .gltf JSON file plus separate buffer and image files.

Is there a maximum GLB file size?

The container's length field is a 32-bit unsigned integer, so the format itself tops out just under 4 GiB — but nothing practical comes close to that ceiling. Because this conversion runs on your own device rather than through an upload, the real limit is how much memory your browser tab can give the model: multi-million-triangle photogrammetry captures and raw scan data are the cases where a desktop tool such as Blender or MeshLab will be more comfortable than a browser converter. For the assets GLB was actually designed for — product models, AR objects, game props, typically a few megabytes — file size is not a consideration at all.