What this tool does
Use this STL viewer to inspect binary or ASCII STL files locally in your browser.
When this tool fits
Best when checking slicer-ready mesh geometry
the viewer shows the parsed STL mesh, triangle count, and dimensions.
Best for binary or ASCII STL validation
a successful preview confirms the file can be read as STL geometry.
Best when units need a sanity check
STL lacks unit metadata, so dimensions should be compared with the expected model size.
How to use it
- 1
Upload an STL file
Choose a binary or ASCII STL file from your device.
- 2
Review the mesh preview
Use orbit and zoom controls to inspect the visible model.
- 3
Check size and triangle count
Compare dimensions and triangle count with what you expect before printing.
Specs and limits
- Input
- Binary or ASCII STL
- Output
- Preview only
- Shows
- Mesh count, triangle count, and dimensions
- Does not contain
- Units, colors, textures, materials, or CAD history
- STL has no units, colors, textures, or CAD history.
FAQ
Does STL contain units?
STL stores raw coordinates; units must be inferred from context.
Can this repair a broken STL?
No. The viewer helps you inspect whether geometry loads, but it does not repair non-manifold meshes or missing triangles.
Why does triangle count matter?
Triangle count gives a quick signal for mesh density. Very high counts can slow slicing, while very low counts may show faceting.