Convert GLB to STL
Convert GLB to STL in your browser. The conversion runs on this page and the file never leaves your computer.
Result
Before you convert: what this keeps and what it destroys
Preserved
- The geometry, triangle for triangle
- Overall dimensions and proportions
- Watertightness, where the input is watertight
Destroyed
- A recorded unit: STL stores none
- Colour
- The separation between parts, merged into one body
- Animation, rigs, cameras and lights, if the file has them
↺ the reverse: STL → GLB · about .glb · about .stl · just view it instead
Why people convert GLB to STL
Usually you have a model from an asset library, a scan service or an AR pipeline, and you want to print it.
Scale is the main thing. glTF is defined in metres and STL is read as millimetres, so the coordinates are multiplied by 1000. Without that, a 0.05 m part would arrive as a 0.05 mm speck. This site applies the factor and states it in the report.
Colour and the node hierarchy are both discarded, because STL holds neither. If your slicer accepts 3MF, convert to that instead and keep both.
What you get
You get a binary STL file containing the same triangles the GLB file described. No geometry is added, removed or approximated: mesh-to-mesh conversion is a change of container, and this site's tests check that the triangle count comes out identical.
Not carried across: a recorded unit, colour, the assembly structure. STL has nowhere to put them.
The whole conversion runs on this page, in your browser. Nothing is uploaded, so there is no server that could keep a copy of your file even in principle.
What to check afterwards
- GLB carries no unit. The numbers in the file are just numbers, so the conversion assumes metres. Check the overall dimensions of the result before you commit to machining or printing it. A file exported from a package set to inches will be 25.4 times out.
- The numbers change. STL is read in millimetres and GLB in metres, so every coordinate is rescaled. The result is the same physical size, but the numbers in the file are different numbers.
- Colour is lost. STL has nowhere to store it. If colour matters, pick a target that keeps it: 3MF, GLB, PLY or USDZ.
- Separate parts merge into one body. GLB can describe an assembly and STL cannot, so a multi-part model arrives as a single mesh. 3MF and GLB both keep the structure if you need it.
- Coordinates are stored as 32-bit floats. For a part measured in millimetres that's far finer than any machine tolerance. For a model spanning hundreds of thousands of units it isn't.
If you need something this conversion cannot give you
If the unit has to be unambiguous, convert to 3MF instead. It records the unit in the file, so nobody downstream has to assume millimetres and nobody has to scale by 25.4 after the fact.
If colour has to survive, convert to 3MF for printing, GLB for the web, or PLY if the colour is per-vertex scan data.
If the parts must stay separate, convert to 3MF or GLB. Both keep a real structure, so a five-part assembly arrives as five parts rather than one merged body.
If you are 3D printing and your slicer is current, 3MF is the better target in every respect: smaller, unit-bearing, colour-bearing, and multi-part.
Going the other way
Convert STL back to GLB is the reverse page. It is not the inverse of this one: reconstructing a solid from triangles produces faceted geometry, and tessellating it again would not return you to where you started.
How we know this conversion works
This pair was checked against 7 files from the test corpus on 2026-09-04. Each run parses its own output back in and compares the bounding box, the triangle count and, for closed solids, the volume against the input.
A pair that fails those checks doesn't get a page. That's why this site lists 120 conversions and not the several hundred a format-times-format grid would suggest.