STL to GLB Converter
Processing entirely on your device — large files may take a moment.
STL 3D Model and glTF Binary Model exist for different jobs: STL is the workhorse format of 3D printing: a plain list of triangles describing the model surface, understood by every slicer and CAD tool. GLB is what three.js, model-viewer, Unity and AR quick-look consume — the best choice for showing models on websites.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How to convert STL to GLB
- 1
Select your files
Drag & drop your STL files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to GLB". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted GLB file individually, or grab everything at once as a ZIP archive.
Frequently asked questions
Is this STL to GLB converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Will my model look the same as a GLB?
Geometry, hierarchy and standard materials convert faithfully. Note that Draco-compressed GLB files and exotic extensions are not supported — export those as plain GLB from your original tool first.