To convert other file formats to the "Fabrication Job File" file type, you need software like Autodesk Fabrication CAMduct or a similar tool.
About MAJ files
The .MAJ file format is a specialized MEP (Mechanical, Electrical, and Plumbing) fabrication job file utilized heavily by the Autodesk Fabrication suite, including CAMduct, CADmep, and ESTmep, as well as third-party solutions like MagiCAD. These files act as the primary container for ductwork, piping specifications, nested sheet metal patterns, and manufacturing cost data required to drive CNC machines. Users typically need to convert .MAJ files because the format is strictly proprietary. Opening these files requires an expensive, specialized software subscription, which creates a massive bottleneck when sharing designs with clients, architects, or external contractors who rely on standard CAD viewers. Furthermore, the parametric logic embedded inside the file cannot be read by standard web browsers or generic 3D viewers. If you need to share this data, the best target formats are .DWG or .DXF for 2D and 3D geometric compatibility, or standard .PDF for simple layout reviews. Keep in mind that converting to standard CAD formats will strip away the underlying CNC machine code and cost-estimation metadata, leaving only the visual geometry. Because the .MAJ format is closed and highly proprietary, standard online converters usually fail to process the complex fabrication instructions. Often, only the original Autodesk software can properly read or export the full manufacturing data. However, you can just drag and drop your .MAJ file onto convert.guru to identify the format, inspect the file's metadata, and extract internal text or embedded components. If our analysis detects a supported underlying geometry or embedded format, viewing or partial conversion may still be possible.
Convert.Guru analyzes your MAJ file, detects the exact format, and lets you read the text inside.
If you want to convert MAJ file to DWG, DXF, DGN, RVT, RFA, SKP, 3DM, STEP, IGES, SAT, X_T or X_B, you can use Autodesk Fabrication CAMduct or similar software from the "MEP Fabrication Data Storage" category. In the File menu, look for Save As… or Export….
To convert SLDASM, DGN, PRT, IAM, X_B, CATPRODUCT, SLDPRT, RVT, ASM, DWG, CATPART or DXF files to MAJ, try Autodesk Fabrication CAMduct or another comparable tool in the "MEP Fabrication Data Storage" category.
The MAJ Converter Story
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our MAJ converter.