Free Online STL Repair Tool

🔒 All processing happens in your browser. Your files never leave your device.

Upload STL File

Drag & Drop your STL here or Browse Files

Recommended max file size: 50MB for optimal performance.

Analysis Results

Upload an STL to see its issues.

Vertices: N/A

Faces: N/A

Duplicate Vertices: N/A

Degenerate Faces: N/A

Inverted Normals: N/A

Holes Detected: N/A

Non-Manifold Edges: N/A

Watertight Mesh: N/A

Repair Options

Remove duplicate vertices 0.0001 Fix inverted normals Remove degenerate faces Fill holes 10 Fix non-manifold edges Remove isolated vertices

Visualization

Wireframe View Show Normals Highlight Problems Smooth Shading Sync Cameras

Statistics Comparison

Vertices: N/A → N/A

Faces: N/A → N/A

Issues: N/A → N/A

File Size: N/A → N/A

Why Repair STL Files?

STL files are widely used for 3D printing, but they can often contain errors like holes, inverted normals, or non-manifold edges. These issues can lead to failed prints, incorrect geometry, or problems in slicer software. Our tool helps ensure your models are "watertight" and ready for production.

Common STL Issues:

Holes: Gaps in the mesh surface.
Inverted Normals: Faces pointing inwards instead of outwards.
Non-Manifold Edges: Edges shared by more than two faces, creating ambiguous geometry.
Duplicate Vertices/Faces: Redundant geometry increasing file size and complexity.

Learn more about 3D printing best practices.

Before Repair

After Repair