STL Editor

Professional STL File Editor with Mesh Analysis

Split, scale, and validate STL files with advanced mesh topology analysis. Detect non-manifold edges, check watertight meshes, and find holes in your 3D models. Perfect for OpenFOAM mesh preparation, 3D printing, and CAD workflows.

Powerful Features

Everything you need to work with STL files efficiently

3D Visualization

Interactive 3D viewer with rotation, panning, and face selection

  • Real-time mesh visualization
  • Face selection tools
  • Wireframe/solid toggle

Solid Separation

Extract and organize solid objects into separate files

  • Drag-and-drop organization
  • Multiple output buckets
  • Visual solid management

Export & Download

Export individual files or download all as a zip archive

  • ASCII STL format
  • Batch export as ZIP
  • Proper file naming

STL Scaling & Transform

Resize your 3D models with precise scaling operations

  • Uniform scaling with custom factors
  • Real-time preview
  • Undo/redo support

Non-Manifold Edge Detection

Advanced topology analysis to identify mesh quality issues

  • Cross-solid edge analysis
  • Visual edge highlighting
  • Triangle face marking

Watertight Mesh Analysis

Detect holes and boundary edges in your 3D meshes

  • Hole detection and visualization
  • Boundary edge highlighting
  • Watertight mesh validation

Perfect For

Designed for engineers, researchers, and makers

OpenFOAM Mesh Preparation

Prepare STL files for CFD simulations by separating different boundary surfaces, checking mesh quality, and ensuring watertight geometry for snappyHexMesh processing. Detect non-manifold edges and holes that could cause simulation issues.

3D Printing Projects

Split complex 3D models into separate components, scale models to fit printer beds, and validate mesh integrity. Check for holes, non-manifold edges, and other issues that could affect print quality.

CAD & Mesh Validation

Validate exported STL files from CAD software, identify topology issues, and ensure mesh quality before importing into analysis software. Perfect for FEA and CFD preprocessing workflows.

Ready to Get Started?

Join engineers and makers who trust STL Editor for advanced 3D mesh analysis, watertight validation, and professional STL file processing.