GLB vs FBX: Which 3D File Format Should You Use in 2026?

Choosing between GLB and FBX is one of the most common format decisions in 3D workflows — and picking wrong costs you hours of re-exporting, broken textures, or lost animations. This guide breaks down exactly where each format excels, what breaks when you convert between them, and how to switch formats in seconds without installing any software.

What Is GLB?

GLB is the binary container format for glTF (GL Transmission Format), a standard originally published by the Khronos Group — the same organization behind OpenGL and Vulkan. It was designed from the ground up for one purpose: delivering 3D content efficiently over the web.

A single .glb file packs everything together:

Geometry — vertices, faces, normals, and UV coordinates
PBR materials — base color, metallic, roughness, emissive, and normal maps
Textures — embedded directly in the file, no external dependencies
Skeletons and animations — keyframed animation and skinning weights
Scene hierarchy — node transforms and parent-child relationships

Because of this completeness in a compact package, GLB has become the de facto standard for web 3D, AR experiences, and most modern game engines' asset pipelines. Three.js, Blender, Unity, Unreal Engine, Godot, and every major AR platform (Apple's AR Quick Look, Google's Scene Viewer) all read GLB natively.

What Is FBX?

FBX (Filmbox) is a proprietary format owned by Autodesk. It emerged from the film and game production world in the late 1990s and remains deeply embedded in professional DCC (digital content creation) pipelines.

FBX's strengths come from its production heritage:

Complex animation rigs — FBX stores sophisticated skeletal hierarchies, blend shapes, and animation stacks that legacy tools understand deeply
Industry incumbency — Maya, 3ds Max, MotionBuilder, and countless older pipelines treat FBX as their native interchange language
Mature tool support — ZBrush, Cinema 4D, Houdini, and most DCC software import and export FBX reliably

The catch: FBX is proprietary and its specification is not fully open. Support outside the Autodesk ecosystem depends on SDKs that tools must license or reverse-engineer, which is exactly why web browsers and lightweight viewers avoid it.

Head-to-Head Comparison

Here's how the two formats stack up across the factors that matter most:

Feature	GLB	FBX
Open standard	✅ Khronos Group, royalty-free	❌ Autodesk proprietary
File size	Compact binary	Larger, redundant data common
PBR materials	✅ Native glTF 2.0 PBR	Partial (converter-dependent)
Textures	Embedded in file	Often external or embedded inconsistently
Animation	Keyframes, skinning, morph targets	Advanced rigs, blend shapes, animation layers
Web browsers	✅ Universal (Three.js, Babylon.js, model-viewer)	❌ Not supported
AR platforms	✅ AR Quick Look, Scene Viewer	❌ Not supported
Blender	✅ Full support	✅ Full support
Unity	✅ Full support	✅ Full support
Unreal Engine	✅ Full support	✅ Full support
ZBrush / older DCC tools	Limited	✅ Native
Long-term archiving	✅ Specification is public	Risky (vendor-controlled)

When to Use GLB

Reach for GLB whenever your destination is any of the following:

Websites and web apps — if the model will be viewed in a browser, GLB is essentially your only sane choice. The <model-viewer> web component, Three.js, and Babylon.js all expect glTF/GLB.
AR experiences — both iOS and Android AR ecosystems treat GLB as first-class content.
E-commerce product visualization — compact file size and embedded textures mean faster load times and higher conversion.
Cross-engine asset sharing — moving assets between Blender, Unity, and Unreal is frictionless with GLB because the PBR material model maps cleanly across all three.
Long-term storage — an open specification means you'll still be able to open these files in 20 years.

When to Use FBX

FBX remains the right call in specific professional contexts:

Legacy pipeline handoff — if the receiving studio or artist works in Maya, 3ds Max, or MotionBuilder daily, FBX preserves their existing workflow.
Complex character rigs — blend shapes, animation layers, and constraint systems survive FBX round-trips through Autodesk tools better than through glTF.
Motion capture data — mocap suites and retargeting tools in film production still overwhelmingly speak FBX.
Older DCC software — tools like ZBrush and legacy versions of CAD-adjacent packages often have mature FBX import but weak or missing glTF support.

What Breaks When Converting Between Them

Conversion between GLB and FBX is well-supported, but no conversion is lossless. Know what to expect:

GLB → FBX

PBR materials may arrive as simplified Phong or Lambert shaders; you may need to reconnect texture nodes manually in the destination tool
KHR extensions (draco compression, texture transforms, clearcoat) are typically dropped — decompress Draco before converting
Some metadata (custom node properties) won't transfer

FBX → GLB

Animation layers get flattened to a single animation clip
Blend shapes usually convert, but shape order and names can shift
Embedded media in older FBX versions (pre-2014) may fail to extract; re-export from the source tool with "binary" format and embedded media enabled first

Universal advice

Always verify these four things after any GLB↔FBX conversion: texture assignments, animation timing, scale (FBX unit systems vary wildly — centimeters vs meters is the classic gotcha), and axis orientation (GLB is Y-up, FBX conventionally Z-up).

How to Convert GLB to FBX (and Back) in Your Browser

You don't need a Blender install or an Autodesk subscription for a one-off conversion. Our free online converter handles GLB ↔ FBX directly:

Open the 3D Converter page
Drag in your GLB file (or click to browse) — files process locally in your browser, nothing is uploaded
Choose FBX as the target format
Download the result

The same workflow works in reverse for FBX to GLB when you're bringing legacy assets to the web. Conversions run client-side using WebAssembly, so even files with hundreds of thousands of polygons finish in seconds — and your IP never leaves your machine.

Frequently Asked Questions

Is GLB better than FBX?

Neither is universally better — they serve different ecosystems. GLB wins for web, AR, and open pipelines; FBX wins inside legacy Autodesk-centric production workflows. If you're starting a new project in 2026 with no legacy constraints, default to GLB.

Does FBX have better compression than GLB?

No. GLB binary output is typically 20–40% smaller than equivalent FBX files because glTF's binary layout was designed for minimal size, while FBX carries legacy overhead. If file size matters, also consider dedicated 3D compression tooling with Draco or meshopt.

Can FBX animations play in a browser?

Not directly. Browsers can't read FBX. Convert the FBX to GLB first — keyframed animations and skeletal animation transfer cleanly, though animation layers flatten into single clips.

Why does my model double in size after conversion?

Unit scale mismatch is the usual culprit: FBX files in centimeters imported into a meters-based system get scaled 100×, which also inflates bounding boxes and physics calculations. Check the import scale settings, not the geometry itself.

Which format should I use for Unity?

Both work, but GLB is increasingly preferred for new Unity projects. Unity's glTF import via plugins is mature, and GLB keeps your pipeline consistent with web delivery. Use FBX only when pulling assets from Maya/Max artists who deliver in it.

The Bottom Line

GLB is the open, compact, web-native standard that every modern platform reads. FBX is the entrenched professional interchange format that legacy DCC pipelines demand. Convert rather than compromise: keep authoring in whatever your tools prefer, and deliver GLB for everything that touches a screen in a browser.

Ready to make the switch? Run your first GLB to FBX or FBX to GLB conversion now — free, private, and no sign-up required.

GLB vs FBX: Which 3D File Format Should You Use in 2026?