Free online GLB and glTF viewer

glTF and GLB in one paragraph

glTF 2.0 is the Khronos Group's open format for delivering 3D scenes — often called "the JPEG of 3D". It stores meshes, a node hierarchy, physically based (PBR) materials, textures, skinning and animation in a form that real-time engines can load with little processing. It comes in two packagings: .gltf, a JSON file that points to separate .bin buffers and image files, and .glb, a single binary file that contains everything.

GLB is what web stores, AR pipelines and most 3D-asset sites hand out, because one file is hard to break.

How to open a GLB or glTF here

1. For a .glb: drag it onto the drop zone above, or click Choose 3D file.
2. For a .gltf: drag the whole folder, select the .gltf, .bin and texture files together, or drop a ZIP of them. A lone .gltf usually cannot load, because its geometry lives in the .bin.
3. The scene opens full screen. Select Original as the model colour to see its materials; pick a solid colour to judge the shape alone.
4. Rotate, zoom and pan, switch to orthographic or wireframe view, and on a computer measure distances or open the mesh analysis.

If a referenced file is missing, Mes3D lists it by name instead of showing an empty scene.

What is shown

• Every mesh in the scene, with its node transforms applied.
• PBR base colour and textures in the Original view.
• Bounding-box dimensions and triangle count.
• Volume, surface area, watertightness and overhang ratio in the analysis panel — handy when a GLB from a 3D-asset site is meant to be printed.

What it is not: an animation player or a material editor. Animations are not played, and lighting is the viewer's own neutral setup rather than the scene's lights.

Compressed GLB files

Many GLB files on the web are compressed to download faster:

Compression	What it does	Opens in Mes3D?
None	Plain buffers	Yes
Draco (KHR_draco_mesh_compression)	Compresses mesh geometry	Not yet
Meshopt (EXT_meshopt_compression)	Compresses buffers	Not yet
KTX2 / Basis (KHR_texture_basisu)	GPU-compressed textures	Not yet

If a GLB will not open and came from a web pipeline, compression is the likely cause. The open-source glTF-Transform command line can write an uncompressed copy, and most 3D tools (Blender included) can re-export without it.

GLB for printing

GLB is a display format: it is excellent for web and AR, but slicers mostly expect STL or 3MF. Before printing a GLB, check two things:

• Is it closed? Display models are often built from open surfaces and intersecting pieces. The analysis panel reports open and non-manifold edges.
• What size is it? glTF is defined in metres, while printing works in millimetres. Check the dimensions before you send it to a slicer.

The guide to watertight and manifold meshes explains what to do when the check fails.

On a phone

GLB files open in a mobile browser here for viewing, rotating and dimensions. The Mes3D app for iPhone, iPad and Android opens GLB attachments directly, and adds AR so you can place the model in the room in front of you, plus measuring, mesh analysis and cross-sections. On iPhone and iPad, installing it also gives .glb and .gltf files a 3D preview and thumbnail in the Files app.