Q
Is a GLB file smaller than a GLTF file?
A
The file size is usually about the same as the original GLTF. Because all assets are combined into one file, loading requires only a single request, so the perceived loading speed is clearly faster.
GLTF to GLB
GLTF → GLB: bundle scattered assets into one file.
Workspace
Drop files here
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About This Tool
GLTF models often ship as multiple files: separate JSON, BIN buffers, and textures. Each one triggers a separate network request when loaded in a browser, which slows things down. This converter merges those scattered assets into a single GLB file. Everything lives in one compact package, so deployment is simpler and pages load faster, making GLB a natural fit for CDN delivery and WebGL applications.
Frequently Asked Questions
View all FAQsQ
Do I still need the original GLTF files after conversion?
A
No. The GLB already contains all of the original GLTF data, so the source files can be archived or deleted. If you later need to edit individual assets, unpack the GLB with a GLB-to-GLTF converter.
Q
Are GLTF material extensions preserved?
A
Yes. Standard material extensions such as metallic roughness and transmission are kept in the GLB. Custom or non-standard effects may not display correctly in every viewer.
Q
What happens to multiple .bin files?
A
GLTF can reference several .bin files for mesh and animation data. During conversion all .bin content is merged into the single GLB file, so you no longer have to manage separate assets.
Q
My GLTF is already a single embedded file. Do I still need to convert it to GLB?
A
If every asset is already inlined, converting makes little practical difference: GLB is essentially the same glTF content wrapped in a binary container. The conversion is most valuable when the model is split across many files, since GLB bundles everything into one compact package.
Q
Is GLB a good choice for hosting on a CDN?
A
Yes. With all content in one file, a GLB requires only one request and has no relative paths that can break, which makes it a reliable option for CDN delivery and web distribution.
About Configuration Options
General Settings
Up axis
Y-up- Determines the 'up' axis of the exported model. Different 3D software uses different conventions. Selecting the wrong system may cause the model to lie on its side.
- Y-upRecommended: Convention used by OpenGL, Three.js, and most Web 3D engines. Choose this for models from web or game engines.
- Z-up: Convention used by Blender (default), 3ds Max, and some CAD software. Try this if the model appears sideways.
Rotation X
0°-180° – 180°- Rotate the model around the X axis (degrees). Useful for correcting axis misalignment or print orientation.
Rotation Y
0°-180° – 180°- Rotate the model around the Y axis (degrees). Useful for correcting axis misalignment or print orientation.
Rotation Z
0°-180° – 180°- Rotate the model around the Z axis (degrees). Useful for correcting axis misalignment or print orientation.
Rotation Application
Root node transform- Choose how rotation is written to the exported model. Baking into vertices rewrites all vertex coordinates so every export format (including geometry-only formats such as STL and STEP) applies it consistently; root node transform keeps the original vertex coordinates, which is friendlier to animated or skinned models, but formats that ignore node transforms (such as STEP) won't apply the rotation.
- Bake into vertices: Rotation is written into all vertex coordinates and applies consistently to every export format; geometry data is rewritten.
- Root node transformRecommended: Rotation is written as a root node transform while vertex coordinates stay unchanged; better for skinned or animated models, but formats that ignore node transforms (such as STEP) won't apply it.
Format Information
Input format
- Full Name:
- GL Transmission Format (glTF 2.0)
- Type:
- 3D Scene
- Format:
- GLTF
- Tools:
- Three.js、Babylon.js、Blender
- Open With:
- 3D Model Viewer、GLTF Viewer
- Description:
- glTF is an open standard 3D format by Khronos, dubbed the JPEG of 3D. It uses JSON for scene structure, separate .bin for geometry, and independent textures, enabling incremental loading and streaming. glTF 2.0 is the mainstream format for exchanging 3D content across web, mobile, and game engines. Compared to GLB, glTF uses multiple files, ideal for CDN on-demand loading and resource reuse, but prone to reference loss. For single-file sharing, GLB is more reliable. For fine-grained loading or frequent partial updates, glTF offers flexibility.
Notes:
- External resources (.bin, textures) need to be kept together
- May require additional tooling for CAD workflows
Supported Features:
- Common 3D format
Output format
- Extension:
- glb
- Full Name:
- GL Transmission Format Binary (glTF 2.0)
- Type:
- 3D Model
- Format:
- GLB
- Tools:
- Three.js、Babylon.js、Blender
- Open With:
- 3D Model Viewer、GLB Viewer
- Description:
- GLB is the binary glTF 2.0 format from Khronos Group, packing meshes, materials, textures, and animations into one file. It is the standard for Web 3D and AR/VR, used by Three.js, Babylon.js, model-viewer, and e-commerce previews for self-contained, reliable distribution. GLB supports PBR materials, skeletal animations, Draco and Meshopt compression, suitable for web, AR, and cross-software use. However, it loses CAD parametric history when tessellated from STEP or native CAD. For 3D printing, use STL or 3MF as slicers cannot import GLB.
Notes:
- Some 3D printing slicers cannot directly import GLB files
- Not suitable for CAD parametric editing
Supported Features:
- Single self-contained binary file
- PBR material support (base color, metallic, roughness, normal maps)
- Skeletal animation, skinning, and morph targets
- Draco mesh compression and KTX2 texture compression
- Multi-mesh nodes and scene hierarchy