STL Viewer
View STL files, inspect dimensions and mesh information, measure models and check print-related geometry.
Open STL ViewerFREE BROWSER-BASED STL TOOLS
Check your STL before printing
View, inspect and repair STL files directly in your browser. STLPad checks mesh problems locally — your files never leave your device.
Files stay in your browserNo signupFree to useDesktop and mobile
STL Checker
Check whether an STL is open, non-manifold, degenerate or otherwise needs review before slicing.
Check an STLSTL Repair
Repair common STL mesh problems locally, including degenerate geometry, duplicate faces, orientation issues and safely fillable holes.
Repair an STLFOCUSED STL MEASUREMENTS
Get a quick answer from your STL
A SIMPLE WORKFLOW
View → Check → Repair → Slice
Inspect the model, review its mesh diagnostics, make safe supported repairs, then validate the result in your slicer.