GLB vs STL
GLB carries materials, textures and animation for rendering and AR. STL carries geometry only, for printing. They are not really alternatives: converting GLB to STL is what you do before printing, and it discards everything except the mesh.
Side by side
| Spec | GLB | STL |
|---|---|---|
| Type | 3D model | 3D model |
| Extensions | .glb | .stl |
| Introduced | 2017 | 1987 |
| Compression | Both | None |
| MIME type | model/gltf-binary | model/stl |
| Use it when | Showing a 3D model on the web, in a game engine, or in AR. | Sending a model to a slicer or a 3D printer. |
| Avoid it when | Printing the model (use STL) or continuing to author it in a DCC tool (use its native format). | The model needs colour, textures or materials, or is destined for a web viewer or AR. Use GLB. |
Where the usual answer breaks
None worth noting. Choose by destination: printer means STL, screen means GLB.
GLB
- Everything in one file: meshes, PBR materials, textures, animation
- Designed for fast runtime loading, not for editing
- Native support in browsers, game engines and AR viewers
- Not an editing format; round-tripping through it loses authoring data
- Not accepted by 3D printing slicers
STL
- Accepted by essentially every slicer and 3D printer
- Dead simple format, hard to get wrong
- Decades of tooling support
- No colour, texture, material or animation data
- No units, so scale is ambiguous between applications
- Files get very large because vertices are repeated per triangle
Tools for these formats
GLB to STL Converter
Pulls mesh geometry out of GLB or glTF files and exports clean, printable STL, handy for slicing software and 3D printers.
GLB to OBJ Converter
Extracts mesh geometry from GLB or glTF files and exports it as Wavefront OBJ for editing in older desktop 3D modeling tools.
STL to GLB Converter
Converts STL 3D models to GLB (glTF binary) entirely in your browser, no upload or account needed, ready for web viewers, Unity, or Godot.
STL to OBJ Converter
Converts STL mesh files to Wavefront OBJ format, useful when an older modeling tool or export pipeline expects OBJ instead of STL.
Other comparisons
Last updated 2026-08-03