Convert STL 3D models — locally, in your browser
Turn an STL mesh into a browser-friendly GLB file without sending the model anywhere. The conversion runs entirely on your device.
What this tool does
The converter reads both binary and ASCII STL triangle meshes and writes a validated GLB asset with positions and normals preserved. STL is geometry-only, so materials, textures and scene metadata are not invented or silently added.
The result is checked before download and the measured output size is shown honestly, including when the GLB is larger than the source mesh.
How to convert an STL model without uploading it
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Add the model. Drop your .stl file into the CompressKit tool.
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Convert to GLB. The mesh is parsed and packaged as a browser-ready GLB locally.
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Download locally. Download the validated GLB directly to your device.
Supported operations
This list is generated from CompressKit's capability registry — only implemented and tested operations appear here.
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Convert format
Convert binary or ASCII STL triangles into a validated GLB mesh.
Frequently asked questions
- Is my STL uploaded anywhere?
- No. The STL is parsed and converted inside your browser. The file bytes never leave your device.
- Does the conversion preserve materials and textures?
- STL does not contain standard material or texture data, so the GLB contains the mesh geometry and normals only.
- Can I open the GLB in a 3D viewer?
- Yes. The output is a standard GLB containing the converted triangle mesh and can be opened by compatible browser viewers and 3D tools.
Ready to try it?
The STL converter tool runs on this site with no upload step — your file is processed by your own browser and saved back to your device.
Open the STL converter tool