# OBJ to GLB Converter

> Pack an OBJ, its .mtl and its textures into one GLB for the web, AR or a game engine. Drop the folder or a .zip and get a single file back.

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

An OBJ with textures is at least three files that break if one goes missing. A GLB is one. The converter reads the .obj, follows its .mtl to the texture images, and writes a single GLB with every material and texture embedded.

OBJ has no units, so the numbers pass straight into glTF's metres: a model built in Blender (1 unit = 1 m) stays the same size. If your OBJ was made in millimetres for printing, set the file units to millimetres and it shrinks to real size. OBJ's Y up already matches glTF.

## How to convert OBJ to GLB

1. **Drop your OBJ files.** Drop the .obj with its .mtl and texture images, 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 face is kept; quads and n-gons are split into triangles. |
| Color | Kept: materials, textures and vertex colors are embedded. |
| Units | OBJ has bare numbers, so they pass through as metres: 1 unit becomes 1 metre. If the preview size is wrong, set the file units. |
| Orientation | Both are Y up, so it stays the right way up. |
| Objects | Each part stays a separate object or mesh. |

## OBJ at a glance (Wavefront OBJ)

OBJ came out of Wavefront Technologies' animation software and became the plain-text lingua franca of 3D. The geometry is in the .obj; colors and texture references live in a companion .mtl file, which is why OBJs so often arrive grey.

- **Stores:** Vertices, faces (triangles, quads, n-gons), UVs and normals as text
- **Color:** Materials and textures in a separate .mtl file; vertex colors as an unofficial extension
- **Units:** None, the numbers are bare
- **Up axis:** Y by convention (Blender, Maya, most 3D apps)
- **File size:** Text: about a binary STL's size for bare geometry, up to twice that with UVs and normals
- **Opens in:** Blender, Maya, 3ds Max, ZBrush, Cinema 4D, game engines, most slicers

## 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

- **Drop everything** Drop the .obj, .mtl and images together, or a .zip, so the textures make it into the GLB.
- **Check the preview** If the preview is grey, the converter didn't get the .mtl or textures; the note says which file is missing.
- **Lighter files** Run the GLB through Draco or Meshopt compression for the web.

## FAQ

### Does OBJ to GLB keep textures?

Yes, as long as you drop the .mtl and texture images (or a .zip) with the .obj. They are embedded in the GLB.

### Why is my GLB 1000 times too big?

Your OBJ was in millimetres, but OBJ has no units, so 50 became 50 m. Set the file units to millimetres and convert again.

### Can I convert OBJ to glTF instead?

Yes: pick glTF as the output for a JSON file with the data embedded.

### 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.

## Related

- [OBJ to STL Converter](https://printpal.io/convert/obj-to-stl)
- [GLB to STL Converter](https://printpal.io/convert/glb-to-stl)
- [GLB to OBJ Converter](https://printpal.io/convert/glb-to-obj)
- [GLB to glTF Converter](https://printpal.io/convert/glb-to-gltf)
- [OBJ to 3MF Converter](https://printpal.io/convert/obj-to-3mf)
- [GLB to 3MF Converter](https://printpal.io/convert/glb-to-3mf)
- [GLB to USDZ Converter](https://printpal.io/convert/glb-to-usdz)
- [OBJ to USDZ Converter](https://printpal.io/convert/obj-to-usdz)
- [3D model viewer](https://printpal.io/tools/3d-model-viewer)
- [3D model converter](https://printpal.io/tools/3d-model-converter)
- [Mesh Repair](https://printpal.io/tools/mesh-repair)
- PrintPal for LLMs: https://printpal.io/llms.txt