# Convert STEP to OBJ Online: STP to Mesh Output

Convert STEP/STP models to an OBJ triangle mesh. OBJ does not declare reliable units, and the mesh is not an editable CAD solid.

Convert STEP or STP geometry to OBJ when the next tool wants a triangle mesh. The output approximates surfaces with triangles and does not keep the CAD feature tree.

## Inspect the STEP model first

Confirm the expected bodies and one known dimension before converting. A mesh made from the wrong scale or the wrong revision will look complete and still be unusable.

## Convert STEP to an OBJ mesh

Choose OBJ and download the mesh. Curves become triangles. The OBJ file does not declare a reliable unit, and CADProps treats OBJ coordinates as millimetres when you measure it here.

## Check scale after conversion

Reopen the OBJ and compare a known size. Mesh area and volume are approximate, and volume requires a closed, consistent mesh. The conversion does not restore a precise CAD solid.

## Questions

### Can I convert STEP to OBJ online?

Yes. Upload a STEP or STP file, choose OBJ and download the triangle mesh.

### Does OBJ keep the units from the STEP file?

No. OBJ does not declare a reliable unit. When CADProps measures an OBJ file, it treats the coordinates as millimetres. Verify a known dimension in the receiving application.

### Is the OBJ file still a CAD solid?

No. It is a triangle mesh. It does not keep the STEP feature tree, and it cannot be treated as an exact solid.

## Related guides

- [OBJ Mesh Units and Volume: Check Scale and a Closed Shell](https://www.cadprops.com/guides/obj-mesh-units-and-closure/index.md)
- [STEP vs STL: CAD Measurement, Geometry and Accuracy](https://www.cadprops.com/guides/step-vs-stl/index.md)
- [CAD File Conversion Checklist: Units, Solids & Accuracy](https://www.cadprops.com/guides/cad-conversion-checklist/index.md)

## Related tools

- [STEP viewer](https://www.cadprops.com/tools/step-viewer/index.md)
- [OBJ viewer](https://www.cadprops.com/tools/obj-viewer/index.md)
- [STEP to STL](https://www.cadprops.com/tools/step-to-stl/index.md)

HTML page: https://www.cadprops.com/tools/step-to-obj/