123DX to STL Converter

Select files for conversion or just drag and drop them to the upload area

How to convert 123DX files to STL online?

Step 1.

Upload 123DX-file

Click "Choose File" button to select a 123dx file on your computer. 123DX file size can be up to 50 Mb.
Step 2.

Convert 123DX to STL

Click "Convert" button to start conversion.
Step 3.

Download your STL

When the conversion process is complete, you can download the STL file.

Information about 123DX and STL file formats

Name 123DX STL
Full name 123D Design Model File Stereolithography File Format
File extension .123dx .stl
MIME type
Developed by Autodesk Inc. 3D Systems
Type of format
Description 132D Design three-dimensional model file with the three-dimensional geometry of the model and materials which specify the surface appearance of the model. Connections between parts are automatically assigned in models. This provides the model natural motions when moved. STL is a file format native to the stereolithography CAD software created by 3D Systems. This file format is supported by many other software packages. It is widely used for rapid prototyping, 3D printing and computer-aided manufacturing. STL files describe only the surface geometry of a three-dimensional object without any representation of color, texture or other common CAD model attributes. The STL format specifies both ASCII and binary representations. Binary files are more common, since they are more compact.
Technical details An STL file describes a raw, unstructured triangulated surface by the unit normal and vertices (ordered by the right-hand rule) of the triangles using a three-dimensional Cartesian coordinate system. In the original specification, all STL coordinates were required to be positive numbers, but this restriction is no longer enforced and negative coordinates are commonly encountered in STL files today. STL files contain no scale information, and the units are arbitrary.
File conversion 123DX conversion STL conversion
Associated programs Autodesk 123D TurboCAD, GOM Inspect, STL Viewer, Geomagic Explorer, Parametric Technology Creo, Dassault Systemes CATIA, KeyCreator, MeshLab, SolidWorks, Pro/Engineer, CloudCompare, Blender, AutoCAD, 3D Studio Max, Autodesk Inventor, Mechanical Desktop
Wiki https://en.wikipedia.org/wiki/Autodesk_123D https://en.wikipedia.org/wiki/STL_(file_format)