Convert STEP 3D CAD files (STP) online for free
The converter easily converts your STP 3D models to various formats - free and online. No CATIA or other 3D software needed.
The converter also works in reverse, so you can convert other "STEP 3D CAD File" formats to STP without using software like CATIA or a similar tool.
The .STP file is a standard 3D assembly format defined by the ISO 10303 specification, commonly known as STEP (Standard for the Exchange of Product model data). It is universally used in engineering and manufacturing to transfer 3D models between different CAD systems without losing dimensional accuracy. It represents 3D objects using precise mathematical curves and surfaces (NURBS) stored in plain-text ASCII format. These files are typically handled by enterprise-grade software like CATIA, SolidWorks, or AutoCAD.
Despite its status as an industry standard, the .STP format has major disadvantages. Because it relies on plain-text encoding to store highly complex mathematical parameters, file sizes quickly bloat to hundreds of megabytes. They are notoriously slow to parse, computationally heavy, and usually require expensive proprietary software just to view. Furthermore, base .STP files (AP203) do not natively store texture or lighting data, and the format is completely unsupported by web browsers or standard image viewers.
Converting .STP files is essential for practical use outside of an engineering department. To 3D print the model, convert it to STL or 3MF. For web rendering, augmented reality, or integration into game engines, convert to OBJ or GLTF (note that precise mathematical curves will be permanently meshed into polygons during this process). If migrating to older CAD software, converting to IGES is standard practice. Drag and drop your file here to analyze and convert it - free, online, and without installing software.
Use Convert.Guru to open and convert your STP file.
Users also converted STEP, 3D, SPT, STD, X_T, PRT, IPT, IGS, CATPART, 3DXML, STL, STF and SAT files.
If you want to convert STP file to DWG, IFC, DXF, DGN, RVT or RFA, you can use CATIA or similar software from the "3D CAD Data Exchange" category. In the File menu, look for Save As… or Export….
To convert SLDASM, DGN, PRT, IAM, X_B, CATPRODUCT, SLDPRT, RVT, ASM, DWG or CATPART files to STP, try CATIA or another comparable tool in the "3D CAD Data Exchange" category.
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 STP converter.