Step 1
Upload an STL file
Choose a binary or ASCII .stl up to 50 MB. The file stays on your device.
Free online converter
STL to GLB Converter
Upload an STL, convert it locally in your browser, and download a GLB. No account and no server cost. The result is geometry only — STL never stored colors.
STL to GLB in your browser
Runs in your browser. Files stay on your device. Max 50 MB.
Drop a STL file here, or click to browse
Accepts .stl only
How to convert STL to GLB
Step 2
Convert locally
The triangles are packed into a GLB with a simple default material so you can preview it in the browser.
Step 3
Download the GLB
Use the GLB in web viewers, Blender, Unity, or Unreal. Add materials there if you need color.
STL vs GLB
STL is a print mesh. GLB is a web-ready container that can also hold materials — but this converter cannot invent lost color.
STL is a print mesh
Slicers expect STL. The format is a list of triangles with optional non-standard color extensions that most tools ignore.
GLB is easier to preview
GLB opens in browsers and game engines. After conversion you get a single mesh with a neutral material, ready to inspect or texture later.
What you should know
This direction is useful when you have a printable STL and need a GLB for preview or a web workflow.
No textures to recover
If the STL came from a colored GLB, those materials are already gone. Conversion cannot restore PBR maps.
Units still missing
STL has no unit. The GLB inherits the same numbers. Scale the asset in your DCC tool if it looks wrong.
Need a printable file again?
Use the GLB to STL converter. Or generate a fresh textured GLB from an image with TRELLIS 2.
STL to GLB FAQ
Is this STL to GLB converter free?
Yes. It runs in your browser with no sign-in and no paid API call.
Do you upload my STL?
No. Parsing and export happen on your device.
Will the GLB have textures?
No. STL does not store textures. The GLB uses a simple gray material so you can preview the mesh.
Does binary vs ASCII STL matter?
Both are accepted. Binary STL is smaller. ASCII STL is text and can be much larger for the same mesh.
What is the file-size limit?
50 MB. Very dense meshes may take longer because conversion happens in the tab.
Can I convert the GLB back to STL?
Yes. Open the GLB to STL converter. You will still have geometry only.
I need a textured model, not a conversion.
Generate a PBR GLB from one image with TRELLIS 2 instead of converting an existing STL.