glTF format (.gltf) — open, view, convert

What is a glTF file?

glTF is the Khronos royalty-free standard for transmitting 3D scenes. The JSON variant keeps the scene description human-readable with geometry in sidecar buffers, and the ecosystem — Babylon.js, Unity, Unreal, Blender and the browser engines — treats it as the native interchange format for real-time 3D.

Industry-standard for real-time and web 3D
Readable JSON scene description
Full PBR material model and animation support

Best for: Real-time engines, web development and 3D pipelines.

View glTF files online

Open .gltf files in the free online glTF viewer — assembly tree, section views and display modes, entirely in your browser.

How to open a glTF file

Open the online glTF viewer. It runs in your browser, so there is no software to install and no account to create.
Drop your .gltf file in. The file is parsed locally and never uploaded. Inspect it with the assembly tree, section views and display modes.
Convert it if you need another format. Press Convert to turn glTF into STL, then download the result straight from your browser.

Convert glTF to other formats

glTF to STL glTF to OBJ glTF to PLY glTF to GLB glTF to 3MF glTF to OFF glTF to USDZ

Convert other formats to glTF

STEP to glTF IGES to glTF BREP to glTF STL to glTF OBJ to glTF PLY to glTF GLB to glTF 3MF to glTF COLLADA to glTF AMF to glTF FBX to glTF 3DS to glTF OFF to glTF LAS to glTF PCD to glTF XYZ to glTF PTS to glTF

Frequently asked questions

How do I open a .gltf file?

Drop it into the free online glTF viewer on this site — it renders in your browser with an assembly tree and section views, and the file is never uploaded. No software install needed.

Does glTF store units and colors?

Units: meters by spec. Colors/materials: full pbr materials. Geometry is stored as gpu-ready triangle mesh.

How do I convert glTF to STL?

Use the free glTF to STL converter: drop the file, press Convert, download. Everything runs locally in your browser — no upload, no signup.

What is glTF best used for?

Real-time engines, web development and 3D pipelines.

Why can a glTF file fail when its JSON looks valid?

A .gltf document can depend on external .bin buffers and texture images referenced by relative paths. Moving only the JSON breaks those references; use GLB when the model must travel as one file.

Can glTF store animation?

Yes. The conversion pipeline on this site handles static geometry, hierarchy and flat colors only, so it does not write or display animation tracks.

glTF file format (.gltf)