What is preserved
The viewer reads ASCII and binary STL geometry; supported binary vertex colors may be available to the loader.
Free · No signup · Browser-local
STL Viewer
Check an STL surface mesh before opening a slicer or desktop modeling tool.
View locally
Select your STL file
Choose a local 3D file to start the preview.
What can be lost or unsupported
- Viewing does not infer physical units
- The STL format normally contains no materials or textures
How to use this tool
- Choose a local .stl file under 100 MB.
- Wait for the preview and statistics.
- Orbit, pan, zoom, and inspect the model.
Common uses
- Inspect a downloaded STL
- Check mesh bounds and triangle count
- Preview before slicing
Frequently asked questions
Are my files uploaded?
No. Model parsing, preview, and export run in your browser.
Is the conversion lossless?
No format conversion is described as lossless. Review the format-specific warnings above before using the output.
What is the file-size limit?
100 MB is a safety ceiling, not a guarantee. Mobile devices may need substantially smaller files.