STL Repair Tool

Free online tool to repair STL files for 3D printing by fixing common mesh issues like holes, non-manifold edges, and flipped normals.

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About This Tool

This free online STL repair tool helps you fix common issues in 3D model files before 3D printing. Upload your STL file and automatically repair holes, non-manifold edges, flipped normals, intersecting triangles, and degenerate geometry. The tool processes files locally in your browser for privacy and speed, with advanced algorithms available via server-side processing for complex repairs. Perfect for 3D printing enthusiasts, designers, and engineers who need to ensure their models are watertight and printable.

Save your calculation history with a free account

How to Use

Click the upload area or drag & drop your STL file
Select repair options (auto-fix all issues or choose specific repairs)
Click 'Repair STL File' to process your model
Download the repaired STL file and view repair statistics
For complex files, the tool automatically uses server-side processing

Frequently Asked Questions

Find Quick Answers

What STL file issues can this tool repair?

The tool repairs holes in meshes, non-manifold edges, flipped normals, intersecting triangles, degenerate faces, and disconnected shells. It can also remove duplicate vertices and fix bad edges.

Is my STL file data kept private?

Yes, for most repairs the processing happens entirely in your browser. Only complex repairs requiring server-side algorithms send the file to our secure servers, and files are deleted immediately after processing.

What is the maximum file size supported?

The tool supports STL files up to 50MB for browser processing and up to 100MB for server-side processing. Larger files may require more processing time.

Does this tool work with binary and ASCII STL formats?

Yes, the tool supports both binary and ASCII STL file formats. It automatically detects the format and processes accordingly.

Can I preview the repaired model before downloading?

The tool provides detailed repair statistics including number of faces repaired, holes filled, and issues fixed. For full 3D preview, you'll need to use a separate STL viewer after downloading the repaired file.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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