Free 3D File Converter
STL to GLB Converter
Drag in a .stl file, see it in 3D, and download a clean .glb in seconds — right in your browser. No upload, no sign-up. Review the 3D preview before downloading the converted file.
- ✓ 100% free
- ✓ Private — nothing uploaded
- ✓ Instant, in-browser
- ✓ No sign-up
No 3D file handy? Try a classic model
Click any model to load it into the converter above and convert it instantly.
Sample models from the public common-3d-test-models repository.
.stl in 3D printing & CAD export .glb out Web, AR & real-time (single file) How to convert STL to GLB
Drop your .stl file into the box above, click to browse, or pick a classic sample model. It loads instantly — nothing is uploaded.
Your model renders in an interactive 3D viewer. Drag to rotate and confirm it is the right mesh.
Click Convert to GLB and download your .glb file — ready for three.js and any GLB app.
STL vs GLB: what's the difference?
| Feature | STL | GLB |
|---|---|---|
| Geometry (mesh) | ✓ | ✓ |
| Color | — | ✓ |
| Materials | — | ✓ |
| UV textures | — | ✓ |
| Best for | 3D printing & CAD export | Web, AR & real-time (single file) |
| File size | Compact (binary) | Compact (binary) |
What is the STL format?
STL describes a 3D surface as a simple mesh of triangles. It is the universal language of 3D printing and CAD export, supported by every slicer and printer — but it stores only raw geometry, with no color, material or texture data.
What is the GLB format?
GLB is the binary form of glTF: a single self-contained file that packs geometry, PBR materials, textures and animation together. It is the preferred delivery format for the web, AR Quick Look and game engines because it loads fast and never loses its textures.
Why convert STL to GLB?
STereoLithography (.stl): STL describes a 3D surface as a simple mesh of triangles. It is the universal language of 3D printing and CAD export, supported by every slicer and printer — but it stores only raw geometry, with no color, material or texture data.
Converting to GLB keeps that exact geometry and unlocks color, materials and UV textures, which STL cannot store. GLB is the binary form of glTF: a single self-contained file that packs geometry, PBR materials, textures and animation together. It is the preferred delivery format for the web, AR Quick Look and game engines because it loads fast and never loses its textures.
This converter does the translation locally, in your browser: your file is read into a real 3D engine, shown so you can confirm it, then re-exported as a standards-compliant GLB — no server, no account, no upload queue.
When to convert STL to GLB
Texturing & rendering
Open the GLB in Blender, Substance or your renderer to add colour, PBR materials and textures the STL could not hold.
Game & real-time assets
Engines such as Unity and Unreal prefer web, ar & real-time (single file) formats. The converted GLB fits straight into asset pipelines.
Editing & remeshing
Need to sculpt, retopologize or repair a model? Convert to GLB so it opens in the tools that handle that best, then export again.
Sharing & interchange
GLB is widely supported, making it a safe format for handing a model to a teammate, client or another application.
Open the GLB output
The exported GLB imports into major tools for web, ar & real-time (single file):
- three.js
- Babylon.js
- Blender
- Unity
- Unreal
- model-viewer
Tips for the best STL → GLB results
- • Repair scans first. If your STL came from a 3D scanner, run a quick mesh repair (Blender or MeshLab) to close holes before converting.
- • Add colour after converting. STL stores no colour, so assign materials and textures in your 3D app once you have the GLB.
- • Check scale & orientation. Different tools assume different units. After importing the GLB, confirm the model's size and up-axis match your scene.
- • Keep the original. Conversion is one-way here, so hold on to your source STL in case you need to re-export with different settings.
Frequently asked questions
Is this STL to GLB converter free?
Yes — completely free, no sign-up and no watermark. The conversion runs locally in your browser, so your file never leaves your computer and there is no upload wait. The optional 3D preview uses WebGL when available, but conversion does not depend on it.
Does converting STL to GLB lose quality?
No geometry is lost — every vertex and face is preserved. STL has no color, materials and UV textures, so the GLB starts without them, but you can add them afterward in your 3D software.
What is the largest STL file I can convert?
This route accepts STL files up to 50 MB. Conversion runs locally, so a dense model below that limit can still exceed the memory available on a phone or older computer. Simplify very large assets in a desktop 3D application first.
Where can I use the converted GLB file?
GLB is web, ar & real-time (single file). The exported file imports cleanly into three.js, Babylon.js, Blender, Unity and other GLB-compatible tools.
Is it safe to convert private or proprietary models?
Yes. Nothing is uploaded — the file is read and converted on your own device, then the GLB is generated locally for download. Your model stays private.