Convert FBX to GLTF Online
Convert Autodesk FBX (Filmbox) files to GL Transmission Format (glTF), entirely in your browser. No upload, no sign-up. Your files never leave your device.
Drop your FBX file here
or click to browse from your computer (up to 100 MB)
Medieval lantern with dark iron, bronze accents, and warm glass — multi-material FBX model for format conversion testing.
FBX is a proprietary Autodesk format. glTF is an open Khronos Group standard ratified as ISO/IEC 12113:2022, giving you broad tool and engine compatibility.
Skeletal rigs, keyframe animations, and blend shapes stored in FBX are carried over into glTF's standardized animation structure.
Unlike the binary FBX container, glTF uses a human readable JSON file that references external binary buffers and textures, making inspection and debugging straightforward.
Other ways to get GLTF
How to Convert FBX to GLTF
Animations, materials, and rigs preserved in an open, inspectable format.
Upload FBX
Drag and drop or select your .fbx file. FBX bundles geometry, materials, skeletal rigs, and animations into a single file.
Processing
Conversion runs entirely in your browser. Meshes, PBR materials, skeletal rigs, and keyframe animations are extracted from the FBX and mapped to the open glTF format.
Download glTF
Get your ready to use glTF files with animations and materials preserved. The JSON structure is easy to inspect, and assets load natively in web viewers and game engines.
Why convert FBX to glTF?
FBX was originally developed by Kaydara and is now a proprietary format owned by Autodesk. It became an industry standard in game development and film production because it can store meshes, materials, skeletal rigs, keyframe animations, and blend shapes in a single proprietary container. However, reading and writing FBX reliably requires Autodesk's SDK, which limits interoperability with open source tools and web platforms.
glTF solves that problem. Maintained by the Khronos Group and published as ISO/IEC 12113:2022, glTF uses a readable JSON file that references external binary buffers and texture images. This separation makes assets easy to inspect, version control, and selectively update. The format is supported natively by three.js, Babylon.js, Unity, Unreal Engine, and Blender, making it a practical choice for teams that need to move assets across tools without vendor lock in.
Key advantages of glTF over FBX
glTF is maintained by the Khronos Group and ratified as ISO/IEC 12113:2022.
The glTF manifest is plain JSON, making it easy to inspect and debug with any text editor.
Textures and buffers are separate files, so you can replace one without reprocessing the whole model.
glTF loads directly in browsers via WebGL and WebGPU without plugins or proprietary libraries.
Unity, Unreal Engine, Blender, and all major 3D tools import glTF without additional plugins.
glTF does not depend on any single vendor's SDK for reading or writing.
The JSON text format works well with Git and other version control systems.
FBX vs GLTF
| Feature | FBX | GLTF |
|---|---|---|
| File structure | Single binary or ASCII file | JSON scene + .bin buffer + texture files |
| Animation | Full skeletal, morph, keyframe | Full skeletal, morph, keyframe |
| Materials | Phong/Lambert | PBR metallic-roughness |
| Textures | Embedded or external | External image files |
| Editability | Binary is not human-readable | JSON scene description is editable |
| Specification | Proprietary, no public spec | Open standard with full documentation |
| Default units | Centimeters | Meters |
When to Use Each Format
Use FBX when
- Working within Autodesk tools or game engine import pipelines
- Your assets were authored in Maya, 3ds Max, or similar DCC software
- You need named animation stacks and blend modes during authoring
- Collaborating with teams that use FBX as their standard format
Use GLTF when
- You want to inspect and edit the scene structure in a text editor
- Your pipeline processes textures and geometry as separate files
- You need to swap individual textures without re-exporting the whole asset
- Building for the web and you prefer working with the multi-file glTF layout
Known Limitations
Phong materials are converted to PBR approximations with heuristic metallic/roughness values
FBX animation layers are flattened into linear keyframe tracks
TGA and PSD textures are re-encoded to PNG since glTF only supports JPEG, PNG, and WebP (via extension)
The output is multiple files that must stay in the same directory structure for paths to resolve
FBX to GLTF FAQ
What's the difference between converting to GLTF vs GLB?
The data is identical. GLTF splits it into a human-readable JSON file, a binary buffer, and separate texture images. GLB packs everything into one binary file. Choose GLTF if you want to inspect or edit the scene structure; choose GLB for easy distribution.
Will FBX animations survive the conversion?
Yes. Both formats support skeletal animation, morph targets, and keyframes. Named animation clips are preserved as separate animations in the GLTF output.
Can I convert GLTF back to FBX?
Yes, but some information may be lost in the round trip. PBR materials in GLTF will be approximated as Phong in FBX, and any glTF-specific extensions will be dropped.
Why are my textures separate files now?
That's how GLTF works. The JSON file references textures by relative file path. If you'd prefer everything in one file, convert to GLB instead.
Proprietary vs. Open: The Fundamental Split
FBX was created by Kaydara in the mid-1990s and acquired by Autodesk in 2006. It has no public specification. The binary format is undocumented, and reading or writing FBX files with full fidelity requires Autodesk's C++ SDK. The Blender Foundation reverse-engineered enough of the binary layout to build a partial importer, but gaps remain. Any tool that wants complete FBX support must depend on Autodesk's proprietary library, which ships under a restrictive license that prohibits redistribution and sublicensing without written consent.
glTF takes the opposite approach. The Khronos Group published the full glTF 2.0 specification as an open, royalty-free standard in 2017 and later formalized it as ISO/IEC 12113:2022. Anyone can read the spec, build a parser, or write an exporter without licensing agreements. The format uses JSON for its scene description and references external binary buffers and image files, making every part of the asset inspectable with standard text editors and image viewers. Extensions follow a documented proposal process with public review.
This difference in governance shapes everything else: which tools can support the format, how quickly bugs get fixed, and whether the format will evolve to meet new needs or remain tied to one company's product roadmap.
Tooling and Engine Support
FBX has deep roots in professional animation and game development. Maya, 3ds Max, MotionBuilder, Cinema 4D, Houdini, Unity, and Unreal Engine all treat FBX as a primary interchange format. For skeletal animation workflows, FBX remains the most battle-tested option. Unreal Engine 5 still recommends FBX for importing animated characters, and Unity's animation pipeline was built around it.
glTF support has expanded rapidly. Blender 4.x treats glTF as a first-class citizen with full import and export. Three.js, Babylon.js, PlayCanvas, and other WebGL frameworks load glTF natively. Unity added glTF import through official and community packages. Unreal Engine 5 imports glTF geometry, though animation support lags behind FBX as of UE 5.4. Godot Engine actively recommends glTF over FBX for asset import, citing the open specification and consistent behavior across platforms.
The web ecosystem is where the gap is widest. No major browser engine or web framework loads FBX without a conversion step. glTF loads directly through WebGL and WebGPU with no plugins, no SDK dependencies, and no server processing. For AR experiences, Apple's Quick Look uses USDZ, but Google's Scene Viewer and most web AR frameworks default to glTF. Shopify adopted glTF for product visualization because it delivered fast load times on mobile without sacrificing detail.
Material Systems: Phong vs. PBR
FBX defines materials using two models from the pre-PBR era: Lambert and Phong. Lambert materials have ambient and diffuse color properties. Phong adds specular color and a shininess exponent that controls highlight tightness. These models were designed for visual approximation, not physical accuracy. There is no concept of metalness, roughness, or energy conservation. A polished chrome surface and a matte gray plastic would be described using the same parameters, just with different specular values.
glTF standardizes on PBR metallic-roughness. Every material has a base color, a metallic factor (0.0 for dielectrics, 1.0 for conductors), and a roughness factor (0.0 for mirror-smooth, 1.0 for fully diffuse). The metallic and roughness values pack into a single texture, blue channel for metalness, green channel for roughness. This model separates metals from non-metals at a fundamental level, producing consistent results across any compliant renderer. Extensions add clearcoat, sheen, transmission, and other properties for specialized surfaces.
When converting FBX to glTF, the converter must translate Phong parameters into PBR terms. Diffuse color maps to base color. Specular intensity and shininess get approximated as roughness. Metalness is usually set to 0.0 because the Phong model provides no information about whether a surface is metallic. Results vary, and manual adjustment in a 3D editor after conversion often improves fidelity. Some FBX files exported from newer tools contain Stingray PBS material presets, which map almost directly to glTF's metallic-roughness model, but this is not the common case.
Where the Industry Is Heading
The trend line favors glTF. The Metaverse Standards Forum established a working group specifically to address 3D asset interoperability using glTF and USD, with active participation from Autodesk, Nvidia, Epic Games, and others. The group published gap analyses comparing FBX capabilities to glTF and USD, identifying migration paths and pain points. Their goal is reducing the industry's dependence on proprietary interchange formats.
Khronos continues to extend glTF into new domains. In late 2025, the group announced the KHR_gaussian_splatting extension to bring 3D Gaussian splat data into the glTF ecosystem, with contributions from Autodesk, Bentley Systems, Huawei, Niantic, and Nvidia. A release candidate shipped in February 2026. This kind of active, multi-vendor evolution is possible only because the format is governed by an open consortium rather than a single company.
FBX is not disappearing tomorrow. Animation studios and game teams have decades of tooling and pipeline scripts built around it. But the direction is clear. New web platforms, AR applications, e-commerce viewers, and open-source engines are building on glTF. Converting FBX assets to glTF positions them for this broader ecosystem without discarding the original files.
Practical Guidance for Conversion
Converting FBX to glTF is straightforward, but a few details affect the quality of the output.
- Check your materials after conversion. Phong-to-PBR translation is approximate. Open the glTF result in a viewer and compare surfaces to the original. Adjust metalness and roughness values in Blender or another glTF editor if metals look flat or plastics look too shiny.
- Verify animation integrity. Skeletal rigs and keyframe animations generally transfer well, but blend shapes and complex animation curves may need review. Play back the full animation timeline in a glTF viewer to confirm timing and deformation are correct.
- Embedded textures transfer automatically. FBX files often embed textures inside the binary container. The conversion extracts them and references them from the glTF JSON. If you choose GLB output instead of glTF, textures stay packed in a single binary file for easier distribution.
- Consider GLB for deployment, glTF for editing. GLB bundles everything into one file and is ideal for web delivery and AR. glTF separates the JSON manifest from binary data and textures, making it easier to inspect, version control, and selectively update assets.
- Keep the FBX original. Conversion is lossy in the material direction. If you need to return to Phong-based workflows or feed assets into tools that expect FBX, having the source file saves a round trip.