How to convert STL to GLB
- Drop your .stl file into the box above, or click Choose file.
- Check the 3D preview, size and triangle count.
- Make sure GLB is selected as the output format. Adjust scale or up-axis if needed.
- Click Download. The .glb file is created instantly on your device.
Why convert STL to GLB?
GLB is the format for showing 3D models on websites, in AR and in online stores. Converting STL to GLB gives you a compact single file that
What changes in the conversion
- Up-axis. STL is usually Z-up while GLB is Y-up; the model is rotated so it stands the right way up. Untick "Convert up-axis" to keep the raw coordinates.
- Geometry is preserved. Every triangle, with all object transforms applied, ends up in the new file.
STL vs GLB
| STL | GLB | |
|---|---|---|
| Full name | Stereolithography | binary glTF |
| Stores | geometry only | geometry, materials, textures, hierarchy and animations |
| Colour | No | Yes |
| Textures | No | Yes |
| Units | none – most programs read STL numbers as millimetres | metres by specification |
| Exact CAD geometry | No | No |
About the formats
STL (Stereolithography) was created by 3D Systems in 1987 for its stereolithography printers. It describes only the surface of a model as a list of triangles, without colour, materials or units. It is the default file for 3D printing and the format almost every slicer (Cura, PrusaSlicer, Bambu Studio, Chitubox) opens.
GLB (binary glTF) was defined by the Khronos Group as the single-file binary form of glTF 2.0. It packs meshes, PBR materials, textures, scene hierarchy and animations into one compact file. It is the standard for 3D on the web, AR viewers, e-commerce product views and game engines.
Frequently asked questions
Is this converter free?
Yes. You can convert STL to GLB for free – up to 3 conversions a day, with no sign-up and no watermark. If you need more, Pro gives you unlimited conversions and batch conversion (free for 7 days).
Are my files uploaded to a server?
No. The conversion runs entirely in your browser using WebAssembly and JavaScript. Your model never leaves your computer, which also makes it safe for confidential parts and patient data.
Is there a file size limit?
There is no fixed limit. Files of a few hundred megabytes work on a typical laptop; the practical limit is your device's memory.