Convert STL to GLB
Convert STL files to GLB locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
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How to convert STL to GLB
- Drop your .stl files above, or click Upload Files. You can add many files at once.
- GLB is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. Assimp and three.js runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .glb files as soon as each one finishes.
What to know about STL to GLB conversion
- Geometry, materials and embedded textures are preserved in the GLB output when the source contains them.
STL vs GLB
| Feature | STL (Stereolithography) | GLB (glTF Binary) |
|---|---|---|
| Materials and textures | No | Yes |
| Animation and rigging | No | Yes |
| Best for | 3D printing and CAD workflows | web, AR and game engines in a single compact file |
| Opens in | Cura, PrusaSlicer, Bambu Studio and CAD software | Blender, three.js, Unity, Unreal and online viewers |
STL (Stereolithography): The standard mesh format for 3D printing and CAD, storing triangulated surfaces.
GLB (glTF Binary): The binary form of glTF 2.0, the standard 3D asset format for the web, AR, and game engines.
Conversion options
- Custom output file name
Frequently asked questions
Is it safe to convert STL to GLB here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several STL files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert GLB to STL.
Convert STL to other formats
Convert other formats to GLB
See every STL converter and GLB converter, or browse the full converter directory.