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glTF™ (GL Transmission Format) is a royalty-free specification for the efficient transmission and loading of 3D scenes and models by applications. glTF minimizes both the size of 3D assets, and the runtime processing needed to unpack and use those assets. glTF defines an extensible, common publishing format for 3D content tools and services that streamlines authoring workflows and enables interoperable use of content across the industry.

Specification

NOTE as of September 23, 2021, the glTF 2.0 Specification has been moved to AsciiDoc markup format.

Please provide spec feedback by submitting issues. For technical or art workflow questions, or to showcase your work, join the glTF forum. For quick questions, use the #gltf channel in the Khronos Group Slack.

Quickstart

Overview

<a href="specification/2.0/figures/gltfOverview-2.0.0d.png"><img src="specification/2.0/figures/gltfOverview-2.0.0d-small.png" /></a> From <a href=https://github.com/javagl/gltfOverview/>github.com/javagl/gltfOverview/</a> | <a href="https://www.khronos.org/files/gltf20-reference-guide.pdf">PDF</a> | <a href="https://www.lulu.com/shop/khronos-group/gltf-20-quick-reference/paperback/product-23977667.html">hardcopy</a> | <a href="https://www.khronos.org/developers/reference-cards/">Khronos reference cards</a> <a href=https://github.com/randall2835/gltfOverviewJapanese/releases/tag/v0.1>Japanese translation</a> | <a href=https://github.com/randall2835/gltfOverviewJapanese/releases/download/v0.1/gltfOverview2.0-Japanese.pdf>PDF</a> | by <a href=https://github.com/randall2835/gltfOverviewJapanese>Takuto Takahashi</a> <a href=https://github.com/leeyeel/gltfOverview-Chinese/releases/tag/v2.0.0d>Chinese translation</a> | <a href=https://github.com/leeyeel/gltfOverview-Chinese/releases/download/v2.0.0d/gltfOverview2.0-cn.pdf>PDF</a> | by <a href=https://github.com/leeyeel/gltfOverview-Chinese>@leeyeel</a>

For developers

Sample models for testing runtime engines and content pipeline tools.
- glTF-Asset-Generator provides assets for robust importer validation.
- 100,000+ models under Creative Commons license on Sketchfab (check license for individual models).
Drag-and-drop validator for verifying correctness of existing glTF files.
glTF Tutorial Series
Khronos glTF Sample Viewer with WebGL PBR shaders. (source code)

For artists

Preview tools

Sketchfab
PlayCanvas Viewer
BabylonJS Sandbox
Drag-and-drop viewer
glTF VSCode Extension 3D previews, glTF validation, conversion to/from GLB

glTF Tools
- Resources
Formats Built on glTF
Stack Overflow
Presentations and Articles

glTF Tools

Tools, applications and libraries for working with glTF can be found in the glTF Project Explorer.

Resources

glTF-Generator-Registry - An open registry of tools that create glTF assets, along with structured metadata such as links to documentation and bug trackers.

Formats Built on glTF

3D Tiles - An open standard for streaming and rendering massive heterogenous 3D content.
VRM - A 3D avatar format for VR applications.

Stack Overflow

glTF tagged questions

Presentations and Articles

Intros

glTF 2.0 Launch by Neil Trevett. June 2017
glTF Webinar (video, slides) by Marco Hutter. February 2017
glTF Brief by Tony Parisi, FormVR and Amanda Watson, Oculus. October 2016

Tutorials

All Presentations and Articles

Streamlining 3D Commerce with Material Variant Support in glTF Assets by Daniel Beauchamp and Stephan Leroux at Shopify on behalf the 3D Commerce Working Group. November 2020
Live glTF Asset Editing in Your Browser—Even in AR by Emmett Lalish. August 2020
View a glTF model in AR on Android without leaving your browser by Emmett Lalish. May 2020
The glTF Model Authoring Pipeline video series on authoring glTF models in Blender, by Ed Mackey and Alex Wood. April 2020
glTF Ecosystem Forum during SIGGRAPH. July 2019
SIGGRAPH 2019 glTF BOF Video and slides
- Khronos: Ed Mackey - glTF Overview
- Facebook: Renee Rashid - Spark AR, glTF at Facebook
- Cesium: Omar Shehata - 3D Tiles, Basis Universal
- DGG: Max Limper - Automating the 3D Processing Pipeline
- Uber: Georgios Karnas - glTF in Big Data Visualization
- UX3D: Fabian Wahlster and Moritz Becher - glTF Editor and Tools
- Esri: David Körner - glTF with Esri JS API
- Sketchfab: Alban Denoyel - Publish & Find 3D Models Online
- Google: Adrian Perez - AR Search at Google
- Wayfair: Shrenik Sadalgi - Khronos 3D Commerce Working Group introduction
How to make a PBR 3D model for the web by Arturo Paracuellos. June 2019
Uber’s vis.gl brings glTF to geospatial data visualization by Georgios Karnas, Ib Green, Travis Gorkin, and Xintong Xia. June 2019
Exporting glTF from Animate by Ram Kulkarni. April 2019
glTF: Everything You Need to Know! by Ben Houston. April 2019
GDC 2019 Khronos Developer Days - WebGL & glTF video. March 2019 (slides)
- Khronos: Patrick Cozzi - Overview
- Microsoft: Saurabh Bhatia - Ecosystem and SDK Update
- Google: Chris Joel - <model-viewer> Fidelity Testing
- Adobe: Mike Bond - Adobe Dimension
- Mozilla: Robert Long - Publishing Virtual Worlds with glTF
- Facebook: Susie Su - An On-Demand, Optimizing glTF Backend
glTF Debugging in Visual Studio Code by Gary Hsu. January 2019
SIGGRAPH Asia glTF Overview and CTTF Update by Khronos. December 2018
droidcon SF 2018 - The JPEG of 3D: Bringing 3D scenes and objects into your 2D Android app with glTF by Pierre LaFayette. November 2018
Using the Babylon.js viewer with WebVR and Windows Mixed Reality home by Saurabh Bhatia. November 2018
Behind the Scenes with Adobe Dimension Engineers: How We Built the 3D Publish Feature by Mike Bond. November 2018
OGC and Khronos Form a Liaison to Improve Interoperability within the Geospatial and 3D Graphics Communities. October 2018
If you build it (together), they will come...Mozilla and the Khronos Group collaborate to bring glTF capabilities to Blender by Rosana Ardila. October 2018
glTF and Construction – Part 1: Secrets of the Cloud by Tim Davies. September 2018
glTF and Construction – Part 2: 3D for Everyone by Tim Davies. September 2018
SIGGRAPH 2018 glTF BOF video and materials. August 2018
- Ecosystem update: Patrick Cozzi, Cesium
- glTF for artists: Patrick Ryan, Microsoft
- TurboSquid: Beau Perschall
- Facebook: Pär Winzell
- Microsoft: Gary Hsu and Cedric Caillaud
- STK: Alex Wood, AGI
- VSCode: Ed Mackey, AGI
- Industrial AR with glTF: Johannes Beh, Fraunhofer
- Google Draco: Jamieson Brettle
- Texture transmission: Mark Callow
- IKEA: Martin Enthed
glTF 2.0 – Status and Outlook by Norbert Nopper. July 2018
TurboSquid adds glTF to supported formats for its StemCell initiative. July 2018
Why glTF 2.0 is awesome! by Arthur Brainville. July 2018
Get your glTF on with WebGL/WebVR at Microsoft - June 2018
- Meetup video
- Ecosystem update by Saurabh Bhatia (slides)
- 3D product displays on the web using glTF by Matthew Cedeno and Gary Hsu
- Publishing Virtual Worlds with glTF by Robert Long (slides)
- Compressed Texture Transmission Format by Mark Callow (slides)
- What's new with Draco 3D compression by Frank Galligan (slides)
- glTF at Adobe by Mike Bond
Building the Metaverse One Standard at a Time by Neil Trevett. Web3D. June 2018
Sketchfab uses glTF to bring a search bar to the world of 3D. May 2018
Draco Compressed Meshes with glTF and 3D Tiles by Gabby Getz. April 2018
glTF Momentum Accelerates with New Support from Facebook, Epic, Unity, and Adobe by Khronos. April 2018
GDC 2018 Khronos Developer Days - WebGL & glTF video. March 2018
glTF Ecosystem Update, GTC by Neil Trevett. March 2018
glTF Ecosystem Update, GDC by Patrick Cozzi. March 2018
Adobe Dimension & glTF by Mike Bond. March 2018
Draco 3D Compression Extension to glTF 2.0 by Frank Galligan. March 2018
Mixed Reality with glTF by Tom Mignone. March 2018
glTF Texture Transmission Extension by David Wilkinson. March 2018
glTF in Unreal Engine by Mike Erwin. March 2018
glTF Asset Generator Deep Dive by Gary Hsu. March 2018
GLB Tutorials (exporting from Modo, Substance Painter, Maya, and others) by Facebook. February 2018
[Archived] Convert FBX format to glTF format on Blender and animate it with Three.js (Japanese) by Ryosuke Sakaki. February 2018
Art Pipeline for glTF by Patrick Ryan. January 2018
Call for Participation: glTF Creating a Compressed Texture Extension by Khronos. December 2017
Using glTF Models with A-Frame by Josh Marinacci. December 2017
Creating animated glTF Characters with Mixamo and Blender by Don McCurdy. November 2017
State of glTF 2.0 for WebVR Devs by Don McCurdy, Google. September 2017
glTF Exporter in three.js and A-Frame by Fernando Serrano. August 2017
SIGGRAPH 2017 glTF BOF video. August 2017
- glTF 2.0 and Community Update: Tony Parisi, Unity, and Patrick Cozzi, Cesium
- Microsoft update - Paint 3D, View 3D, 3D in Office and one more thing…: Saurabh Bhatia and Gary Hsu, Microsoft
- glTF VSCode editor: Ed Mackey, AGI
- Autodesk Forge and glTF: Nop Jiarathanakul, Autodesk
- Three.js and A-Frame update: Don McCurdy, Google and Ricardo Cabello, Google
- Introduction to geometry compression on the web with Draco: Michael Hemmer and Jamieson Brettle, Google
- WebGL PBR reference implementation: Scott Nagy, Microsoft, and Mohamad Moneimne, Cesium
- Sketchfab update: Aurelien Chatelain, Sketchfab
- glTF 2.0 Export in InstantUV: Max Limper, Fraunhofer
Physically-Based Rendering in Cesium by Mohamad Moneimne. August 2017
Why we should all support glTF 2.0 as THE standard asset exchange format for game engines by Juan Linietsky. August 2017
Exporting glTF 2.0 from Maya LT by Don McCurdy. June 2017
glTF 2.0: PBR Materials by Saurabh Bhatia. May 2017
glTF Workflow for a Saturday Night by Diego F. Goberna. April 2017
2017 GDC WebGL/WebVR/glTF Meetup YouTube recording. March 2017
Reach the Largest Gaming Platform of All: The Web. WebGL, WebVR and glTF. March 2017
PBR-ready glTF in instant3Dhub / instantUV by Max Limper. March 2017
Call for feedback on glTF 2.0 by Neil Trevett. February 2017
[Archived] Improve expressiveness of WebGL with the topic 3D file format glTF now! (in Japanese) by Yuki Shimada(@emadurandal), WebGL advent calendar 2016 at Qiita. December 2016
Bringing 3D to everyone through open standards by Forest W. Gouin and Jean Paoli. October 2016
Using Quantization with 3D Models by Rob Taglang. August 2016
glTF and Mobile VR: Inclusive standards for a 3D world. Amanda Watson, Oculus, WebGL + glTF BOF. July 2016
glTF Update and Roadmap. Tony Parisi, WebGL + glTF BOF. July 2016
PBR in glTF: Current State. Max Limper, Johannes Behr, and Timo Sturm, WebGL + glTF BOF. July 2016
glTF: The Runtime Asset Format for GL-based Applications. July 2016
glTF working group updates (slides, video). Patrick Cozzi and Tony Parisi, WebGL + glTF BOF. March 2016
FBX to/from glTF (slides, video). Cyrille Fauvel, WebGL + glTF BOF. March 2016
Khronos Group glTF Webinar. Neil Trevett, Virtual AR Community meeting. October 2015
An Introduction to glTF 1.0. October 2015
The state of WebGL and glTF. Patrick Cozzi, The Graphical Web. September 2015
glTF ecosystem and mesh compression update. Khronos 3D Formats Working Group, SIGGRAPH 2015. August 2015
glTF and the WebGL Art Pipeline. Tony Parisi, WebGL Meetup. March 2015
Writing an FBX importer / Exporter plug-in. Cyrille Fauvel. January 2015
glTF Tips for Artists. Branden Coker. December 2014
3D for the Modern Web: Declarative 3D and glTF. Brian Coughlin. Summer 2014
glTF: Designing an Open-Standard Runtime Asset Format. Fabrice Robinet et al, GPU Pro 5. May 2014
Building a WebGL Santa with Cesium and glTF. Patrick Cozzi. December 2013
glTF update. Tony Parisi. August 2013
[Archived] How I got involved in glTF and Khronos. Patrick Cozzi, WebGL Meetup. March 2013

We believe the true usefulness of glTF goes beyond the spec itself; it is an ecosystem of tools, documentation, and extensions contributed by the community. You are encouraged to get involved!