3D Tools

Format guide

GLB vs glTF: which 3D format should you use?

GLB and glTF are two packaging styles for the same modern 3D asset standard. The choice is usually not about visual quality. It is about how the asset is stored, moved, cached and shared.

The short answer

Use GLB when you want a single file that is easy to upload, preview, email, store and serve from a website. Use glTF when you want a human-readable JSON file with separate buffers and textures that can be inspected, edited or processed by a pipeline.

For most ecommerce pages, portfolio previews, AR model handoffs and web-based viewers, GLB is the simpler option. For production pipelines where artists or build tools need to replace textures, inspect material definitions or diff JSON changes, glTF can be easier to work with.

What GLB contains

A GLB file is a binary container. It can include the glTF JSON, binary geometry buffers, animation data, material definitions and image resources in one file. That makes it convenient for upload forms and content management systems because there are no missing sidecar files.

The tradeoff is that a GLB is less convenient to inspect manually. If a texture is wrong or a material needs a small edit, you usually open the file with a tool rather than editing it directly.

What glTF contains

A glTF asset commonly includes a `.gltf` JSON file plus separate `.bin` buffers and image textures. The JSON file describes scenes, nodes, meshes, materials, cameras and animations. External resources are referenced by URI.

This split is useful in pipelines, but it is easier to break when moving files. If the `.gltf` file is copied without its buffer or texture folder, a viewer may load an empty or partially textured model.

When GLB is better

  • You need one uploadable file for a product page, configurator, portfolio or marketplace listing.
  • You want fewer broken texture paths when sharing the model with another person.
  • Your viewer or platform expects a self-contained web asset.
  • You are publishing to a CDN and want simple cache rules for a single model file.

When glTF is better

  • You are debugging material definitions, scene hierarchy or extension usage.
  • Your build pipeline compresses textures and buffers separately.
  • You want to review JSON changes in source control.
  • You need to swap images or buffers without repacking the whole model every time.

Practical recommendation

Keep the editable source file in your 3D tool or pipeline, export glTF while you are debugging, and publish GLB when the model is ready for a website or user upload. If the model is large, optimize geometry and textures before conversion rather than expecting the container change alone to reduce size.

You can check a finished GLB in the 3D model viewer before sending it to a client or uploading it to a web page.