STL Viewer
File ViewersView STL files online with a rotating, zoomable 3D viewer. Check mesh dimensions before 3D printing — no software install, no upload.
Drop a file here, or click to choose
Accepts .stl
Rendered with Three.js (STLLoader). Nothing about this file is ever sent to a server — open your browser's Network tab while using this viewer and you'll see no request carrying your file's contents.
What you can do with this tool
- 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
Frequently asked questions
- 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.
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