Online STL viewer
Drop an STL, OBJ or GLB file on the page and it appears immediately, ready to spin with the mouse. Nothing is uploaded anywhere: the file opens inside your own browser and stays there.
What it tells you
- The bounding box on all three axes, in file units — the fastest way to catch a wrong scale.
- Triangle count: below 5,000 the model is coarse; above a few hundred thousand any slicer slows down.
- Volume, if the file is drawn in millimetres. That is where filament use comes from.
- Estimated mass in PLA, at 1.24 g/cm³.
Why in the browser
A 3D file that arrives by email is usually awkward to open: you need an installed program that takes ten seconds to start. Here it takes two.
More importantly, the file goes nowhere. Many online viewers upload your model to their server. Here every calculation happens on your page, so you can safely open work you care about.
Does my file reach your server?
No. It is read directly in the browser with JavaScript. You can even cut the internet once the page has loaded and the viewer keeps working.
Why does my model look tiny or enormous?
STL files carry no units. If the bounding box reads 0.3 × 0.2 × 0.1, the file was probably drawn in metres rather than millimetres.
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