A GLB file (extension .glb) is the binary version of glTF, a 3D format that packs a 3D model's shape, colors, materials, and animation into a single portable file. It is fair to think of it as one of the easiest standard formats available today whenever you want to hand a 3D model to someone else or show it in a web browser. In this article we walk through what GLB is, how to open it, what it is good for, and how it differs from other formats, at a level that does not require any specialist knowledge.
Note: Figmee currently lets you upload a drawing or illustration and then generate and download figurine-style images and 3D model data (GLB / 3MF). Sales of physical 3D-printed items are Coming Soon.
What is a GLB file: the binary version of glTF
The quickest way to understand what GLB really is, is to start with its foundation: glTF.
glTF is a free (royalty-free), open standard for efficiently exchanging 3D scenes and models, created by the industry consortium Khronos Group (source: Khronos glTF official site, as of July 2026). The current version, glTF 2.0, was also adopted as the international standard ISO/IEC 12113:2022 in 2022. A helpful way to picture it is as a shared format that everyone can use, designed to be something like the JPEG or PDF of 3D.
glTF can be saved in two main ways.
- glTF (.gltf): A main JSON file accompanied by separate files for meshes, images, and so on. This lets you manage the contents as individual pieces.
- GLB (.glb): All of glTF's contents (shape, materials, texture images, animation, and more) bundled into a single binary file. Because everything lives in one file, it is well suited to sharing and handing off.
The official Khronos description says the same thing: the core of glTF is a JSON file describing the scene structure, and this can be stored in a single binary glTF file (.glb). In other words, think of GLB as glTF that stays together in one file instead of scattering into many.
What a GLB file contains
The main elements that glTF and GLB can hold are as follows (source: Khronos glTF official site, as of July 2026).
- Scenes and nodes (the placement and hierarchy of models)
- Meshes (shape information)
- Materials (PBR: base color, metalness, roughness, normals, emission, and other information that renders light reflection realistically)
- Textures (images applied to the surface)
- Skins and animation (motion information)
- Cameras
Unlike formats such as STL that hold "shape only," GLB's biggest strength is that colors and surface qualities all fit into one file. That is why it excels when you want to share a 3D model exactly as it looks.
How to open a GLB file (three ways)
You do not need expensive specialist software to open a GLB. Here are three methods, depending on what you want to do.
- Open it in an online viewer in your browser (about 1 minute)
This is the easiest option. Just drag and drop the
.glbfile into an online 3D viewer that supports glTF/GLB, and it will be displayed. Khronos also publishes an official glTF sample viewer. No installation is needed, so this is ideal when you first want to check what is inside. - Open it in Blender, the free 3D software (about 2 to 3 minutes)
Blender (free and open source) supports importing and exporting glTF 2.0 (.gltf / .glb) out of the box. Choose your GLB via
File → Import → glTF 2.0and it loads in an editable state. Use this route when you want to fix the shape or export to another format. - Open it in a compatible app or AR viewer (about 1 to 2 minutes) Smartphones and computers have 3D and AR viewer apps that support glTF/GLB. Whether this works out of the box depends on the operating system and device, so if you need it to open reliably, the browser viewer above or a compatible app is the safe choice.
3D models you create with Figmee can be rotated 360° inside the app to check them before exporting. Once you have downloaded a model as a GLB, you can open it again with any of the methods above to inspect it. Free online viewers and Blender are the simplest ways to take a quick look at any 3D model you receive.
What GLB is used for
Typical situations where GLB is the format of choice include:
- 3D display on the web: Because a single file can carry colors and materials, it is widely used for 3D views embedded in websites and apps.
- Handing off and sharing 3D models: Nothing gets separated, so sending it to someone or archiving it is easy.
- Bringing models into game engines and 3D software: Many tools support importing glTF/GLB.
- A starting point for editing: A base GLB made with AI or similar tools can be loaded into Blender and refined from there, making it the starting point of a workflow.
For the full picture of exporting an AI-generated 3D model as GLB and finishing it in your own tools, see how to edit a 3D model made with AI.
How GLB differs from other 3D formats
Here is a comparison of common 3D formats by the information they can hold and their main uses.
| Format | Color and textures | Animation | Main uses |
|---|---|---|---|
| GLB / glTF | Supported (PBR) | Supported | Web display, sharing, handoff |
| OBJ | Supported via separate files | Not supported | Exchange between 3D programs (a long-standing classic) |
| FBX | Supported | Supported | Game and animation production (widespread in the industry) |
| STL | Not supported (shape only) | Not supported | 3D printing (the standard, but single-color) |
| 3MF | Supported (full color) | Not intended | 3D printing (handles color and settings too) |
Roughly speaking, GLB is a format for showing and handing off, while STL and 3MF are formats for producing a physical object. For more on 3MF for 3D printing, see what is a 3MF file and how it differs from STL. In short, OBJ is a widely supported older format for moving meshes between 3D programs, FBX is the common choice in game and animation pipelines, and GLB is the best fit when you want everything, including appearance, in one lightweight file.
How to convert GLB files
Depending on your purpose, GLB can be converted to other formats.
- GLB → STL / OBJ / FBX and others: The reliable approach is to load it into Blender and export it in the target format from
File → Export. It can all be done for free. - glTF ⇄ GLB: These are just two ways of storing the same glTF data, so many tools can convert back and forth between them.
- Caution: Converting to STL loses the color information (because STL stores shape only). If you want to 3D print while keeping the colors, choose a format that can carry color, such as 3MF, rather than STL.
Frequently asked questions
What is the difference between GLB and glTF?
They are two different ways of saving the same glTF standard. glTF (.gltf) splits the main file and assets like images into separate files, while GLB (.glb) bundles them into a single binary file. Their expressive power is identical, and because GLB is self-contained in one file, it is better suited to handoff and sharing.
Can I open a GLB file for free?
Yes. Drag and drop it into an online viewer that supports glTF/GLB and it opens without any installation. If you want to edit it, the free Blender supports importing it.
Can I 3D print a GLB file as is?
GLB is a format meant for showing and handing off, so many 3D printing services ask for STL or 3MF. If you want to 3D print, convert it in Blender or a similar tool to a print-oriented format (such as STL or 3MF), and if you want to keep the colors, choose a format that carries color, such as 3MF. When you actually print, always check which formats your print service accepts.
Where can I use GLB files from Figmee?
3D models generated with Figmee can be downloaded as GLB and opened in browser viewers, Blender, and other tools. Sales of physical 3D prints are Coming Soon, so if you want a physical version for now, the route is to take the exported data to an external 3D printing service.
Summary
GLB (.glb) is a binary format that bundles glTF, an open 3D standard, into a single file, and its strength is that it carries shape, color, materials, and motion all together. The easiest way to open one is an online viewer in your browser, and for editing, the free Blender is the go-to choice. If your goal is 3D printing, convert it to a format that preserves color, such as 3MF, and pick the right format for each job.
Start by creating a 3D model with Figmee, downloading it as GLB, and checking its contents in a browser viewer, and you will see for yourself how easy GLB is to work with.
