STL Viewer — View 3D Print Files Online, Free
Open a .stl 3D model and inspect it with full orbit, pan, and zoom controls — mesh dimensions and triangle count included, rendered entirely on your device.
1. Choose or drop a file
2. View instantly
3. Download when done
What this viewer does
- Orbit, pan, and zoom camera controls
- Wireframe toggle to inspect mesh geometry
- Reset-view button to return to the default angle
- Bounding-box dimensions and vertex/triangle count — useful for checking a model fits your print bed
- Handles both binary and ASCII STL files automatically
How it's rendered
Three.js (STLLoader). Parses both binary and ASCII STL encodings and renders the triangle mesh with WebGL, locally.
Nothing about this file is ever sent to a server — open your browser's DevTools Network tab while using this viewer and you'll see no request carrying your file's contents.
100% Private
Files never leave your device. There is no server that ever receives your file's contents.
No Uploads
Every format is decoded and rendered locally via WebAssembly or JavaScript. Open your browser's Network tab and confirm nothing is sent.
No Storage
Nothing is written to a server or database. Memory clears the moment you close or reload the tab.
GDPR-friendly by design
There's no file data collection to comply with in the first place — no account, no tracking of file contents, no analytics on what you view.
STL viewer — FAQ
What is an STL file used for?
STL is the standard format for 3D printing — it describes a model's surface as a mesh of triangles, with no color, material, or scene information, just geometry.
Can I check if my model will fit my print bed?
Yes — the bounding-box dimensions shown next to the model are calculated from the mesh itself, in the file's native units (usually millimeters).
Does it handle both binary and ASCII STL?
Yes, the viewer detects and parses both STL encodings automatically.
Is my 3D model uploaded anywhere?
No — the mesh is parsed and rendered entirely in your browser using Three.js and WebGL.
Is there a model size limit?
No hard limit; very dense meshes (millions of triangles) are bounded by your device's graphics memory.