PRT is not a unique source identifier
Several engineering applications use the PRT extension. Detect the source before choosing a reader and ask for the authoring application when it is not clear. Renaming an extension does not convert the data.
CADProps · CAD tools
Siemens NX PRT Files: Viewer Options & STEP Export
NX viewer is not available in this release. Read the format notes and ask your sender for a self-contained STEP file.
Not available in this release
This format or conversion is not supported. Ask the sender to export a self-contained STEP file, then inspect it with the STEP viewer.
Open STEP viewer →Before you use the result
Know what you are looking at.
Received a PRT file? First confirm that it comes from Siemens NX, sometimes called UG or Unigraphics. A filename extension alone does not identify the reader you need.
Inspect the loading scope
A visible body may be only part of the intended file or assembly. Expose the configuration and loaded components before allowing an overall mass or conversion result to be presented as complete. Keep unresolved references in the task record.
A direct route to an agreed exchange file
Once the source is confirmed, a separate NX-to-STEP task can produce the agreed exchange artifact. Keep the source filename in the task summary.
Questions about this task
Know the limits.
Which files can I process?
Supported inputs are STEP/STP, IGES/IGS, STL, OBJ, 3MF, static GLB/GLTF, bounded ZIP packages and DWG 2D previews. Capabilities depend on format. Native CAD formats and downloadable model conversion are unavailable.
Are files uploaded?
Yes. Selecting or dropping files uploads and processes them immediately in every tool. Files are processed temporarily on this server. The workspace displays the configured retention time. Delete in the file menu permanently removes your files; closing a view does not.
Do I need an account?
No. Your temporary workspace uses a browser session cookie. There is no account, subscription or permanent file library.
How are properties calculated?
STEP/IGES use B-Rep geometry; mesh files use approximate triangle properties and require closed consistent meshes for volume. DWG is a 2D preview without physical properties. STL/OBJ coordinates assume mm. Mass uses your chosen density.
Related reading
Checks that help with this file.
ConversionCAD File Conversion Checklist: Units, Solids & Accuracy
Reopen the output, verify scope and units, inspect critical geometry, and include a short record of what was and was not checked.
Read the guide →
MeasurementMeasure STEP Files Online: Dimensions, Distances & Units
Read a CAD model without confusing bounding-box dimensions, selected geometry measurements and drawing tolerances.
Read the guide →ConversionExport NX PRT to STEP: Units and Assembly Checks
A practical NX-to-STEP handoff checklist covering PRT identification, configuration, units and post-conversion checks.
Read the guide →