Glossary

GLB

GLB stands for GL Transmission Format Binary. It's the binary variant of the glTF standard, developed by the Khronos Group. GLB packs geometry, textures and animations into a single file and has become the de-facto format for 3D on the web, formally standardized as ISO/IEC 12113:2022. Every modern browser, Android device and 3D viewer can display GLB directly, which is why most Web AR runs on it.

Quick Facts

Developed by: Khronos Group
File extension: .glb (binary variant of .gltf)
Standardized as: ISO/IEC 12113:2022
Used for: 3D in the browser, Android Scene Viewer, model-viewer
Alternatives: USDZ (iOS), FBX, OBJ
Typical file size: 500 KB to 10 MB, often much smaller with Draco

GLB won out because it’s the only 3D format that genuinely works everywhere: every smartphone, every modern browser, every game engine import. For WordPress sites that want to show a product in 3D, GLB is almost always the right call, whether for a plain 3D spinner or for the AR step on Android.

On top of that, GLB compresses well. With Draco compression you can often shrink geometry to a third of its size with no visible quality loss. For load times and Core Web Vitals that’s a real win.

For WordPress sites with Elementor, PausAR Viewer handles GLB end to end: drop the Elementor widget in, upload your GLB file, and the plugin renders it as an interactive 3D viewer with an AR button for compatible devices. Add a USDZ variant for iOS users in the same widget and every platform is covered.

Comparison

Property	GLB	glTF (.gltf)
Structure	Single binary file	JSON file plus separate texture files
Practicality	Very high, one upload	Better suited for developer workflows
File size	Compact, minimal with Draco	Similar, more files to manage

FAQ

What's the difference between GLB and glTF?

Content-wise, nothing. glTF splits across multiple files (JSON, textures, geometry), GLB wraps everything into one binary. For day-to-day web use, GLB is usually the better pick.

How do I embed GLB in WordPress?

Use PausAR Viewer, the WordPress 3D and AR plugin for Elementor. Drag the widget into your page, upload your GLB (plus a USDZ for iOS AR), and the plugin serves the right format to each device.

Does GLB work on iPhone?

In the browser as 3D, yes. For real Apple AR you also need a USDZ 3D model. To convert your GLB files into USDZ you can use our free online USDZ Converter.

How do I shrink GLB files?

Use Draco compression at export time in Blender, or run the file through tools like gltf-transform. 8 MB often turns into 2 to 3 MB.