STL 3D Viewer

How it works

This tool parses your STL file's triangle mesh (STL stores a 3D model as a flat list of triangles, no materials or scene structure) and renders it with three.js using your device's own GPU via WebGL. The camera automatically frames the model based on its bounding box, so any dropped file — whatever its native scale — opens centered and visible.

Limitations

STL only, for now — no OBJ, glTF, or other 3D formats yet. STL itself has no color or material information, so every model renders in a single neutral material regardless of the source file.

FAQ

What can I use this for?

Quickly checking a 3D print file before slicing, previewing a downloaded model, or sharing a look at an STL with someone who doesn't have CAD software installed.

Does this support other 3D formats?

Not yet — just STL (both ASCII and binary), the most common format for 3D printing and simple model exchange.

Is my file uploaded anywhere?

No. The model is parsed and rendered entirely in your browser using three.js — nothing is sent to a server.