# GLB Viewer

> Open GLB files from AI generators, Sketchfab, Blender or your web app. Textures, PBR materials and compressed meshes at real size, with a check that tells you whether it will print.

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

GLB is glTF 2.0 packed into one binary file: meshes, materials, textures and animation together. It is the default download from AI 3D generators and most web 3D tools. The viewer reads **Draco** and **Meshopt** compressed meshes and **KTX2** textures, the three things that make simpler viewers fail on optimized files.

glTF is defined in metres with Y up, so the viewer converts it to millimetres and Z up on a build plate: a 0.12 m figure shows as 120 mm, the size a slicer will use if you save it as STL or 3MF. AI generators often export at an arbitrary size, a metre or two across, so check the readout before you print.

## How to use the GLB viewer

1. **Open the file.** Drop .glb files, including Draco, Meshopt and KTX2 compressed ones.
2. **Check size and orientation.** The model stands on the plate in millimetres. Switch to inches, or change the file units or up axis if it looks wrong.
3. **Run the checks.** Read the mesh check, pick your printer to see whether it fits, and use Measure (M) or Section (X) for a closer look.
4. **Save or convert.** Take a PNG screenshot, or save the model as STL, 3MF, OBJ, GLB, PLY or USDZ.

## What you can check

- Textures, PBR materials, vertex colors and multiple meshes
- Draco, Meshopt and KTX2 compressed files
- Size in mm or inches, converted from glTF metres
- Watertight check: AI and scanned models often have holes
- Save as STL, 3MF, OBJ with textures, or USDZ for iPhone AR

## 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 GLB?** The viewer shows the model in its rest pose; animations are not played.
- **Huge textures** Textures are decoded on your device, so a 200 MB GLB opens on most laptops but may struggle on older phones.
- **Print it in color** The [AMS converter](https://printpal.io/tools/ams-converter) turns textures into 2 to 8 filament colors for a multi-color printer.

## FAQ

### What is a GLB file?

A binary glTF 2.0 file: a 3D model with its materials and textures in one file. It is used on the web, for AR on Android, in game engines and by AI 3D generators.

### How do I open a GLB file on Windows or Mac?

Drop it on this page in any modern browser. No app is needed and the file stays on your computer.

### Can I 3D print a GLB file?

Yes, after converting: save it as STL or 3MF here, or use [GLB to STL](https://printpal.io/convert/glb-to-stl). Textures don't print on a single-color printer.

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

Free, with no sign-up, watermark or file limit. The practical limit is your device's memory: files of a few hundred MB open on most laptops.

### Are my files uploaded anywhere?

No. Files are read by JavaScript and WebAssembly in your browser and never sent to PrintPal. Only the code is downloaded, and the STEP and IGES reader once, from a public CDN.

## Related

- [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)
- [GLB to 3MF Converter](https://printpal.io/convert/glb-to-3mf)
- [GLB to USDZ Converter](https://printpal.io/convert/glb-to-usdz)
- [STL to GLB Converter](https://printpal.io/convert/stl-to-glb)
- [OBJ to GLB Converter](https://printpal.io/convert/obj-to-glb)
- [glTF to GLB Converter](https://printpal.io/convert/gltf-to-glb)
- [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