GLB → STL · local conversion
Extract visible mesh geometry from a binary glTF model and download an STL entirely on your device.
GLB → STL
STL cannot store GLB textures, materials, rigging or animation. Only mesh geometry is exported, and game-ready models may need wall thickness or mesh repair before printing.
GLB can bundle meshes, scene nodes, animation, textures, cameras and lights. STL contains only triangles. The conversion preserves mesh transforms and surface geometry while leaving scene presentation data behind.
Drop a .glb file, select Convert to STL and download the binary result. Inspect the STL in a slicer and repair non-manifold or open surfaces before printing when the original asset was designed for real-time rendering.
Drag a .glb file into the converter above, or click to browse. The file stays on your machine — the browser reads it directly and nothing is uploaded to a server. Files up to 50 MB are supported.
Conversion runs inside a Web Worker so the page stays responsive. The converter reads a node hierarchy of meshes with PBR materials, then flattens every visible mesh into STL output. Larger models take longer to parse; meshes with several hundred thousand triangles usually finish in a few seconds.
When conversion finishes, the download starts locally. The output keeps the original filename with a .stl extension. There is no account step, no queue and no watermark.
Open the result in PrusaSlicer, Cura, Bambu Studio, Chitubox and Simplify3D. Confirm dimensions and orientation before applying print or render settings.
| GLB | STL | |
|---|---|---|
| Full name | binary glTF | Standard Tessellation Language |
| File structure | single binary file with embedded buffers and textures | flat binary file of triangle records |
| Geometry model | a node hierarchy of meshes with PBR materials | one unstructured triangle soup, no hierarchy |
| Stores color & materials | Yes | No |
| Carries unit metadata | No | No |
| Typically comes from | Blender, Sketchfab, Substance Painter, Unity and Three.js exporters | the input every FDM and resin slicer accepts |
The usual situation: you have a .glb file from a real-time or web-3D pipeline, but the tool you need to use next only reads STL. Blender, Sketchfab, Substance Painter, Unity and Three.js exporters all export GLB, while PrusaSlicer, Cura, Bambu Studio, Chitubox and Simplify3D typically expect .stl. Practically every slicer treats STL as its baseline input, which makes converting to STL the last step before a print job.
GLB stores a node hierarchy of meshes with PBR materials; STL stores one unstructured triangle soup, no hierarchy. Color, materials and textures do not survive the conversion — that is a property of the STL format itself, not a limitation of this converter. The geometry itself — triangle faces and vertex positions — is preserved in full, and that is what printing and downstream modeling actually depend on.
The model is tens or hundreds of times too large or small. Units did not line up; rescale in millimeters inside your target application. The output is empty or partial. The source may keep geometry on hidden nodes — unhide them and re-export from the original tool. Surfaces render black or inside-out. The converter recomputes normals for meshes that lack them, but faces that were already inverted in the source need fixing in PrusaSlicer, Cura, Bambu Studio, Chitubox and Simplify3D. The file will not open. Check that the extension matches the real format; a fresh export from the source application usually resolves it.
Most online converters upload your file to a server, convert it there and send the result back. For unreleased product designs, client models or anything under NDA, that upload is the moment the file leaves your control. This converter runs three.js loaders and exporters locally in your browser, so the file never crosses the network — the page will even convert with your connection turned off.
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