Open STL files online
View and orbit 3D models from 3D printing, games and modelling — drag to rotate, scroll to zoom. Three.js loads STL, OBJ, glTF/GLB, PLY and VRML (WRL).
Drop a STL file to open it
or click to choose — everything stays on your device
Choose file🔒 100% private — files never leave your browser
Or turn STL into an image — snapshot the preview, add arrows or notes, and download a PNG.
What is a STL file?
View and orbit 3D models from 3D printing, games and modelling — drag to rotate, scroll to zoom. Three.js loads STL, OBJ, glTF/GLB, PLY and VRML (WRL). The .STL extension identifies a 3D model file, which is served with the model/gltf-binary media type. You can open it here instantly — drop the file into the box above and it renders in your browser. Nothing is uploaded.
Besides this free online viewer, you can open 3D models files in desktop apps such as Blender, MeshLab, Windows 3D Viewer — but here all you need is a web browser.
Quick facts
| Format | 3D models — 3D model |
|---|---|
| File extensions | .stl .obj .glb .gltf .ply .wrl |
| MIME type | model/gltf-binary |
| Developer | various |
| Category | 3D, CAD & GIS |
| Also opens in | Blender, MeshLab, Windows 3D Viewer |
How to open a STL file online
- Click Choose file above, or drag your STL file onto the box.
- The right viewer loads automatically and renders your file.
- Read, scroll or page through it. To open a different file, choose Open another file.
100% private — files never leave your browser.
Libraries used to render STL in the browser
This viewer is built entirely with open-source JavaScript that runs in your browser:
Frequently asked questions
What is a .STL file?
A .STL file is a 3D model, identified by the model/gltf-binary media type. You can open and read it instantly in the viewer above without installing anything.
What programs open STL files?
On the desktop, STL files typically open in Blender, MeshLab, Windows 3D Viewer. Online, this page opens them in any modern browser — nothing to download.
How do I convert STL to an image?
Use Snapshot to capture the STL preview, optionally add arrows, text or highlights, then download it as a PNG image.
Is it safe to open my STL file here?
Yes. The file is read and rendered entirely by JavaScript inside your own browser. It is never uploaded to a server, so nothing leaves your device.
Do I need to install anything to view a STL file?
No. There is nothing to install and no account to create. Open the page, drop your file, and it displays instantly.
Does it work on my phone or iPad?
Yes. The viewer is fully responsive and works in modern mobile and tablet browsers such as Safari and Chrome.
Is there a file size limit?
There is no hard limit, but very large files depend on your device’s memory. Big files are processed in the background so the page stays responsive.