Opening a 123DX File

The 123DX file type is primarily associated with 123D.

123DX	File extension: 123DX
	File type:	model

What is a 123DX file

123DX files mostly belong to 123D by Autodesk. A 123DX file is a 2D or 3D model created with 123D Design, a computer-aided design program distributed as part of the 123D application suite developed by Autodesk. This file is saved in ZIP compression format. It contains drawings, model geometry, measurements, textures, materials, and all other assets of a model. Autodesk discontinued 123D design application suite in 2016 and replaced its programs with Fusion 360, Recap, and Thinkercad. The "Upload" feature in newer versions of Fusion 360 allows users to import, edit, and export a 123DX file in a different format.

How to open 123DX files

You need a suitable software like 123D to open a 123DX file. You need a suitable software like 123D from Autodesk to open a 123DX file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your 123DX file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a 123DX file directly in the browser:. Just drag the file onto this browser window and drop it.

Online 123DX Text Viewer

Choose your .123dx file to analyze

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Online File Viewer

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What to Do When a .123DX File Fails to Open

Because .123DX files can originate from different programs, they aren't universally openable.

1. Identify the Source: Receiving this from a 3D designer or printing workflow suggests an Autodesk 123D CAD model.
2. Check the Header: Inspect the first bytes in a text or hex editor:
   • "PK" indicates a ZIP archive.
   • Readable XML/JSON suggests a text-based model.
   • Scrambled characters imply a binary format.
3. Use the Original Software: The original program is usually required. Try Autodesk 123D Design, Meshmixer, or Fusion 360, or ask the sender if uncertain.
4. Use this Webpage: Drag and drop the file into our viewer to detect the format, extract readable metadata, and preview contents when possible.

123DX format details:

A file format defines how the data in the file is structured. The file format can be deduced from the file extension and the signature. File extension, signature and file format must match; otherwise errors will occur when the file is opened. When there is a problem with a file, the first step to solving it is to determine the file format. Our evaluation of the 123DX files is as follows:

The 123DX file extension is quite common and predominantly uses a uniform format. However, the following two file formats are common:

• 98% of all 123DX files use the ZIP format, so multiple files are compressed and stored together in one 123DX file. The included 10 to 11 files have file names such as Manifest.dat and \Fusion[Active]\. If you want to see the included files and images, simply rename the file extension to .zip and double-click it. A typical file size is 230 KB. The keywords Fusion[Active]/PK, Fusion[Active]/Previews/PK, Fusion[Active]/Design1/PK and Fusion[Active]/Bre are typical for these files. Such 123DX files store data about frame, holder, qcjiyu, parts, case, airsoft, replica, workin, table, head and palm.

All other 123DX files (2%) have no uniform format. They are often associated with base, modular, assembled, printable, canister, complete, adapter, scream, dome or roni. Drag & drop your file here to see the file format and a preview of your 123DX file!