STL viewer

Open .stl models — orbit, wireframe, snapshot, convert.

Runs entirely in your browser. Files never leave your device.

Choose a 3D file

Binary or ASCII .stl files

How it works

1
Drop an STL file
Add a .stl model from your device. It is parsed locally with WebAssembly-backed math.
2
Orbit and inspect
Rotate, pan and zoom with the mouse; toggle wireframe to see the triangulation.
3
Snapshot or convert
Save a PNG preview or re-export the mesh as OBJ, PLY or GLB.

Which STL flavours are supported?

Both ASCII and binary STL files are parsed with three.js STLLoader — the same engine used by many desktop slicers.

Is there a file-size limit?

Files are decoded entirely in memory, so the practical limit is your device's RAM. Hundreds of megabytes work on a modern laptop.

Can I convert STL to another format?

Yes. After loading, export the same mesh as OBJ, PLY or GLB from the download menu.

Parse STEP, IGES, BREP via OpenCascade WASM.

Open Wavefront .obj meshes with orbit and wireframe.

Preview .glb and .gltf 3D assets in your browser.

Convert between STL, STEP, IGES, OBJ, PLY, GLB, FBX, 3MF, DAE.

Reduce triangle count with meshoptimizer — lighter STL / GLB.

Snapshot a PNG preview from any 3D model file.