Free Online 123DX to STL Converter

Please note: Your 123DX file, once uploaded to our server will be deleted 1 hour after upload so please download your converted 123DX file before this time.

How to Convert your 123DX to STL Online?

Here are 2 simple steps to convert your 123DX to STL using our fast and free 123DX converter tool.

Upload your 123DX file

Upload your 123DX file

Click the "Upload a 123DX File" button, then select a 123DX to upload. The maximum file size is 100MB.

Download your STL

Download your STL

Click the download link to receive your STL file.

File format information for 123DX and STL

Extension123DX
Full NameAutodesk 123D
TypeCAD
Mime Typeapplication/octet-stream
FormatBinary

Autodesk 123DX, which was initially released in 2009 whose native file format was 123DX, was an easy to use Computer Aided Design (CAD) application aimed at home/hobbyist users for creating 3D models.

The 123DX application was retired in 2016 with users moving on to the more advanced Fusion 360 application from Autodesk.

ExtensionSTL
Full NameStandard Triangle Language
Type3D Model
Mime Typeapplication/vnd.ms-pki.stl
FormatText
Opens WithBlender, MeshLab, CAD Assistant, DAZ Studio

The STL file format has its roots in the 1980's and is the native file format for 3D Systems stereolithography CAD software. The format defines a triangulated mesh with vertices and faces and is a popular format for sharing 3D printable model files.

There were several formats that attempted to extend the STL format namely SolidView and VisCAM whose formats included limited 15-bit color information for each mesh face which is often ignored by most modern 3D software. The STL format can be either Text or Binary, our tools will support both formats.

Frequently Asked Questions

How can I convert my 123DX file to STL?

First click the "Upload..." button, select your 123DX file to upload. Your 123DX file will be uploaded to our servers. When the 123DX to STL conversion has completed, you can download your STL file straight away.

How long does it take to convert my 123DX to STL?

We aim to process all 123DX to STL conversions as quickly as possible, this usually takes around 5 seconds however this can be longer for certain files, so please be patient.

How accurate is the 123DX to STL conversion?

We aim to provide the best conversion experience. Our tools are under constant review and development with new features being added every week.