Format conversion/Mesh ↔ mesh
STL to GLB converter (local)
Convert binary or ASCII STL to a glTF 2.0 binary GLB locally. The Worker streams the STL, welds shared vertices, and writes a single-mesh GLB for download.
Conversion
No uploadReady to convert
The input is streamed in 4 MiB slices; the output is assembled in the Worker and downloaded locally.
- Formats
- STL → GLB
- Worker
- in your browser
Drop an STL here
Binary STL streams in 4 MiB slices; ASCII STL streams line by line.
Choose a fileMax file size: 500 MB · No upload
No upload · File.slice() → Worker → chunked GLB output.
How it works
- 1
Drop one binary or ASCII STL file.
- 2
The Worker streams binary STL in 4 MiB slices and ASCII STL line by line.
- 3
Shared vertices are welded and the GLB writer emits a JSON chunk and a BIN chunk.
- 4
Download the GLB locally. No upload is performed.
What the numbers mean
The GLB writer preserves the source numeric coordinates. glTF conventionally uses metres; the converter does not rescale, so confirm the unit in the target viewer.
The GLB contains one mesh, one node, float32 positions, and uint32 triangle indices. STL has no materials or colors to carry over.
Printing notes
- GLB is useful for web viewers and downstream glTF tools; check that the viewer understands the model's unit scale.
- The output is a compact single-mesh GLB with no textures or materials.
- Keep the original STL until the GLB is verified.
Questions
References
- · glTF 2.0 specification
- · ISO/ASTM 52900