Ready for upload.
Files stay in your browser for preview.STL tool
STL File Inspector Online
Unlock STL tools once for $1.90 to inspect compatible STL mesh statistics locally in your browser.
Sign in, then unlock this viewer once for $1.90. Files stay in your browser; VIP also includes viewer access plus advanced workflows.
Unlock large files, conversion, HD screenshots, recording, AR, and XR experiences.
About this 3D viewer
Inspect a compatible STL mesh locally before printing, sharing, or converting it. The inspector reports binary or ASCII type, triangle and vertex counts, dimensions, normal availability, and degenerate triangles.
STL workflow with Cura, PrusaSlicer, Blender, and CAD software
Use this browser preview on Windows, macOS, or Linux to check an STL exported from Blender, Fusion 360, Tinkercad, or another CAD tool. Then open the model in Cura, PrusaSlicer, Bambu Studio, or your chosen slicer for printer-specific settings and repair checks.
How to use this STL viewer
- Sign in and unlock STL tools once.
- Upload a compatible .stl file.
- Review local mesh statistics and continue to a slicer or repair workflow as needed.
Convert this format
Explore STL file tools
Explore this tool category
STL viewer FAQ
What does STL Inspector check?
It reports file type, mesh size, triangle and vertex counts, dimensions, normal availability, and simple degenerate-triangle detection.
Does STL Inspector repair a model?
No. It provides a basic local inspection and does not repair meshes, make them watertight, or guarantee printability.
Can I preview an STL from Cura, PrusaSlicer, or Blender?
Yes. Upload a compatible STL exported or downloaded from those workflows for a visual browser check. Use the slicer itself for supports, wall thickness, profile settings, and final print preparation.
What file extension does STL use?
This tool accepts the compatible STL extension shown in the upload area. Use the dedicated format viewer when a file has a related extension or an application-specific variant.
Can I use this STL viewer on a phone?
The page can be opened on mobile browsers, but a desktop browser is usually more practical for large files and detailed orbit, zoom, and inspection work.
Do I need to create an account to preview a STL file?
Yes. Sign in first, then unlock this STL tool once for $1.90. VIP members can also access the viewer.