STL 3D Viewer
Open an STL file and spin the 3D model around in your browser — no CAD software needed.
A look before you print
STL is the standard file for 3D printing, but you usually cannot see what is inside one without installing heavy CAD or slicer software. This opens the model right in your browser and lets you orbit, zoom and inspect it — so you can confirm a downloaded part is the thing you expected, check it for obvious problems, or just get a proper look at its shape before you commit filament and hours to printing it.
Drag to rotate, scroll to zoom, and turn the model in your hands the way you would a real object.
Viewing, not editing
This is a viewer, so its job is to show the mesh, not modify it — think of it as a window into the file rather than a workshop. That makes it ideal for the quick question that comes up constantly with 3D files: is this actually the model I think it is? For preparing a print, a slicer takes over from here; for simply seeing what you have got, this is faster and needs nothing installed.
How to view an STL 3D model
- Add your STL file.
- Rotate, pan and zoom to inspect the model.
- Open another model when you are done.
Check a model before you print
STL is the standard format for 3D printing, and viewing one before slicing catches the obvious problems — wrong scale, unintended orientation, a model that is hollow or broken where you expected solid geometry. It is far cheaper to spot that on screen than after hours of printing.
Rotating the model to look underneath is especially worthwhile, since overhangs and unsupported areas are what most often ruin a print.
Common questions
What is an STL file?
The standard 3D printing format, describing a model's surface as a mesh of triangles.
Can I check the size before printing?
Viewing shows the shape and proportions; your slicer confirms exact dimensions and scale.
Is my model uploaded?
No, it is rendered in your browser and stays on your device.
Do I need special software to view an STL?
No. This renders the model in your browser, so there is nothing to install.
Can I rotate and zoom the model?
Yes — drag to orbit around it and scroll to zoom, so you can inspect it from any angle.
Is my file uploaded?
No. The model is loaded and rendered in your browser.