# glTF to GLB Converter

> Pack a .gltf, its .bin buffers and texture images into one GLB file: easier to share, upload and drop into a web page.

Page: https://printpal.io/convert/gltf-to-glb
Updated: 2026-11-12
Use it: open https://printpal.io/convert/gltf-to-glb in a browser and drop a file. Free, no account, files are processed locally and never uploaded.

GLB and glTF hold the same glTF 2.0 data; GLB just packs it into one binary file instead of JSON plus side files. Drop the .gltf with its .bin and images, or a .zip of the folder, and get a single GLB back with the meshes, materials and textures embedded.

The converter rebuilds the file from the loaded scene rather than copying bytes, so it also cleans up: it writes standard materials and decompresses Draco and Meshopt data. Animations, skins and morph targets are not carried. For a byte-exact repack of an animated asset, use glTF-Transform's `copy` command.

## How to convert glTF to GLB

1. **Drop your glTF files.** Drop the .gltf together with its .bin and textures, or a .zip of the folder.
2. **Check the preview.** The model appears at the size and orientation it will have. Fix the file units, up axis or size under Size, units and orientation if needed.
3. **Choose GLB options.** No options needed: GLB is written in metres, Y up, with materials and textures embedded.
4. **Convert and download.** One file downloads straight away. A batch gives a download per file and one .zip of all of them.

## What carries over

| | Result |
|---|---|
| Geometry | Every triangle is kept at full precision. |
| Color | Kept: materials, textures and vertex colors are embedded. |
| Units | Both are in metres, so sizes are unchanged. |
| Orientation | Both are Y up, so it stays the right way up. |
| Objects | Each part stays a separate object or mesh. |
| Animation | Dropped: the model is written in its rest pose. |

## glTF at a glance (glTF 2.0 JSON)

A .gltf is the readable JSON form of glTF 2.0. The geometry usually sits in a separate .bin file and textures in image files, which makes it easy to inspect and edit, and easy to break by moving one file.

- **Stores:** A JSON scene that points at .bin buffers and image files (or embeds them)
- **Color:** Full: textures, base colors and vertex colors
- **Units:** Metres, fixed by the spec
- **Up axis:** Y, fixed by the spec
- **File size:** JSON plus buffers; embedded base64 adds about a third
- **Opens in:** Web viewers, Blender, three.js, Babylon.js, game engines

## GLB at a glance (glTF 2.0 binary)

glTF 2.0 is the Khronos Group's "JPEG of 3D", and GLB is its single-file binary form. It is what AI 3D generators, Sketchfab downloads and web apps hand out, and it is the only common format whose units (metres) and axes (Y up) are fixed by the spec.

- **Stores:** Meshes, PBR materials, textures, animation and scenes in one binary file
- **Color:** Full: textures, base colors and vertex colors
- **Units:** Metres, fixed by the glTF spec
- **Up axis:** Y, fixed by the spec
- **File size:** Compact; Draco or Meshopt compression shrinks meshes 5 to 10 times
- **Opens in:** Web viewers, Blender, Windows, Android Scene Viewer, Godot, Unity and Unreal importers

## Tips

- **Animated assets** Use glTF-Transform for animated or skinned files; this converter writes static meshes.
- **Smaller GLB** Re-apply Draco or Meshopt compression after packing for the web.
- **Check textures first** Open the folder in the [glTF viewer](https://printpal.io/tools/gltf-viewer) to see that every texture resolves.

## FAQ

### Is glTF to GLB lossless?

For static meshes, materials and textures, yes. Animations, skins and compression extensions are not carried over.

### Why is my GLB bigger than the .gltf files?

Compressed (Draco or Meshopt) input is written uncompressed. Compress the GLB again if size matters.

### Do I need to drop the .bin and textures?

Yes, unless they are embedded in the .gltf. A .zip of the folder is easiest.

### Is the converter free? Are there limits?

Free, with no sign-up, watermark or file count limit. Batches and files of a few hundred MB work on most laptops; the only limit is your device's memory.

### Are my files uploaded?

No. Files are read and written by JavaScript and WebAssembly in your browser and never sent to PrintPal. The STEP and IGES reader is the only extra download, once, from a public CDN.

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