STL Viewer — Open STL Files Online
Preview STL models right in your browser before you slice them. Orbit, zoom and inspect prints on any machine — no install, no upload.
Upload 3D Model
Drag and drop or click to upload your 3D model file
Click or drag to upload
Supported formats: GLB, GLTF, OBJ, STL, FBX
3D Preview
No model loaded
Upload a 3D model file to preview it in the 3D Viewer
STL is the workhorse of 3D printing — every slicer reads it, every scanner can output it, and every model-sharing site hosts it. But STL files are naked triangle soups: opening one outside a slicer usually means installing desktop software for a ten-second look.
This STL viewer renders your file locally with orbit, zoom and three lighting presets. Check a model's orientation before printing, inspect scan quality, or preview a download — then send it to the compressor if the file is heavier than your slicer likes.
Open STL in the browser when you need to:
- Check models before committing them to a print queue
- Preview 3D scanning and photogrammetry output instantly
- Review community downloads without installing yet another tool
How to View a 3D File Online
Open your STL file
Drag the file onto the viewer or click to browse. It is loaded locally in your browser — nothing is uploaded to a server.
Explore the model
Orbit, zoom and pan to inspect the STL model from every angle. Switch lighting presets to check surfaces and details.
Download or keep inspecting
Grab the file again at any time — the viewer never modifies your model. Close the tab and nothing is left behind.
Other 3D Viewers
Every format gets its own optimized preview pipeline — pick yours.
Frequently Asked Questions
How do I view an STL file online?+
Drag the STL onto the viewer above or click to browse. It renders locally in your browser with full orbit and zoom — no slicer, no CAD tool and no upload required.
Can I check if my STL is watertight here?+
The viewer shows the mesh as-is, so obvious holes and missing surfaces are visible when you orbit around. For rigorous watertight validation, run the file through your slicer's repair step.
Does the viewer show both ASCII and binary STL?+
Yes — both STL encodings load. Binary files open noticeably faster since they are far more compact than the ASCII form.
The STL has no colors — is that normal?+
Yes. Standard STL stores geometry only — no colors or materials — so the viewer applies a neutral studio shading. For colored models, convert the source file to GLB or PLY with vertex colors.
Don't Have a STL File Yet?
Generate one first — turn a text prompt or a photo into a 3D model, then spin it around right here in seconds.
Create a 3D Model