Free CAD Converter Online

CAD (Computer-Aided Design) files are used in engineering, architecture, and manufacturing. DWG is the native AutoCAD format, while DXF is a universal exchange format. STEP and IGES are standard formats for 3D models, and STL/OBJ are commonly used for 3D printing. Convert between these formats to ensure compatibility with different CAD software and manufacturing processes.

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Popular CAD conversions

DWG Converter DXF Converter STEP Converter IGES Converter STL Converter OBJ Converter

What is a CAD Converter?

A CAD converter is a tool that transforms files between Computer-Aided Design formats — enabling engineers, architects, and designers to open and share drawings across different software platforms without purchasing multiple expensive licenses. Our free online CAD converter handles 2D drawings (DWG, DXF), 3D models (STEP, IGES), and 3D printing files (STL, OBJ) directly in your browser — no AutoCAD, SolidWorks, or CATIA license required.

How to Convert CAD Files — 3 Steps

Select Your Format

Choose the CAD format you want from the format cards above — DWG, DXF, STEP, IGES, STL, or OBJ.

Upload Your CAD File

Upload your CAD file. Complex geometry files may take a few seconds to process. Files are handled securely and never retained.

Download & Open

Download your converted file and open it in your target software — AutoCAD, SolidWorks, Fusion 360, Blender, or your 3D printer slicer.

Supported CAD Formats — Full Guide

Format	Full Name	2D / 3D	Open With	Best For
DWG	AutoCAD Drawing	2D / 3D	AutoCAD, BricsCAD, LibreCAD	Industry-standard 2D drafting and technical drawings
DXF	Drawing Exchange Format	2D / 3D	AutoCAD, QCAD, FreeCAD, Illustrator	Cross-software 2D geometry exchange
STEP	Standard for Exchange of Product Data	3D	SolidWorks, CATIA, Fusion 360, FreeCAD	3D model sharing between different CAD systems
IGES	Initial Graphics Exchange Specification	2D / 3D	SolidWorks, CATIA, Rhino, AutoCAD	Legacy 3D data exchange, widely supported
STL	Stereolithography	3D	Blender, Meshmixer, Cura (slicer), Ultimaker	3D printing, mesh modeling, manufacturing
OBJ	Wavefront Object	3D	Blender, Maya, Cinema 4D, 3ds Max	3D rendering, animation, game development

CAD Converter — FAQ

Can I view DWG files without AutoCAD?

Yes. Convert your DWG to PDF or SVG using our free tool — the resulting file opens in any browser or PDF viewer without any CAD software. Autodesk also offers a free DWG TrueView viewer for Windows, but converting to PDF is the most universal approach.

What is the difference between DWG and DXF?

DWG is AutoCAD's native binary format — smaller and faster but requires AutoCAD or a compatible reader. DXF (Drawing Exchange Format) is an open format developed by Autodesk for data interoperability. DXF files are larger but can be opened by nearly any CAD application, including free tools like QCAD, FreeCAD, and LibreCAD.

What is the best format for 3D printing?

STL (Stereolithography) is the universal standard for 3D printing — all slicers (Cura, PrusaSlicer, Ultimaker, Bambu Studio) support STL input. OBJ is also widely supported and preserves color information if needed. For high-precision manufacturing with tolerances, STEP is preferred over STL as it represents exact geometry rather than triangulated meshes.

Is my CAD file safe to upload?

Yes. Engineering and design data is highly sensitive, and we treat it with strict confidentiality. Files are transferred over encrypted HTTPS connections and permanently deleted from our servers after your download is complete. We never retain, share, or analyze uploaded CAD files.

What CAD software can open STEP files?

STEP (.stp / .step) is supported by virtually all professional CAD applications: SolidWorks, CATIA, Autodesk Inventor, PTC Creo, Siemens NX, Rhino 3D, FreeCAD, and Fusion 360. It's the most universally interoperable 3D format and should be your default for sharing 3D models between different software environments.

Secure & Private

All conversions happen locally in your browser. Your files are never uploaded to our servers, ensuring 100% privacy and security for your sensitive documents.

Lightning Fast

Experience instant conversions without waiting for file uploads or downloads. Our optimized algorithms ensure the fastest processing speeds possible.

Universal Access

Access CAD Converter from any device - Windows, Mac, Linux, iOS, or Android. No software installation or registration required.

High Quality

Maintain the highest possible quality during conversion. We use advanced processing to ensure your files look exactly as intended.

About CAD Converter

Convert CAD files between DWG, DXF, STEP, IGES, STL and many other formats. High quality conversion with no software installation required.

Why Use Our CAD Converter?

Free to use forever - no hidden costs or subscriptions
No file size limits or usage restrictions
Works offline - once loaded, you can use it without internet
Clean, user-friendly interface designed for efficiency

Frequently Asked Questions

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