STL2STEP Converter

Upload your STL file and convert it to STEP format with 3D preview and mesh optimization

Upload
Click to upload or drag and drop
STL files accepted
Note: Preview retriangulates for WebGL display. The downloaded STEP file contains a triangle-optimized geometry.
3D Preview
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Free Online STL to STEP Converter

Convert your STL files to STEP format instantly with our free online converter. Perfect for 3D printing enthusiasts, CAD engineers, and product designers who need to transform mesh files into editable CAD models. Our tool processes STL (stereolithography) files and outputs industry-standard STEP (ISO 10303) files compatible with SolidWorks, AutoCAD, Fusion 360, and other professional CAD software.

Why Convert STL to STEP?

STL files are ideal for 3D printing but lack the parametric data needed for CAD editing. Converting to STEP format allows you to edit, modify, and reverse-engineer 3D models in professional CAD applications. STEP files preserve geometric accuracy and are the industry standard for exchanging CAD data between different software platforms.

How to Convert STL to STEP

Our conversion process is simple and fast:

  1. Upload your STL file (up to 100MB) by clicking the upload area or dragging and dropping
  2. Preview your 3D model in our interactive viewer with customizable colors and materials
  3. Click "Convert to STEP" to process your file with automatic mesh optimization
  4. Download your converted STEP file, ready for use in any CAD software

Common Use Cases

Reverse Engineering: Convert 3D scanned STL meshes into editable CAD models for modification and analysis. 3D Printing to CAD: Transform your 3D printed designs back into parametric models for editing. File Format Compatibility: Share designs with colleagues using different CAD software. Manufacturing Preparation: Convert STL prototypes to STEP format for CNC machining or injection molding toolpath generation.