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.
CADProps · CAD tools
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.
No account required
Temporary workspaceCAD processingBefore you use the result
Know what you are looking at.
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.
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 about this task
Know the limits.
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 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 →MeasurementOBJ Mesh Units and Volume: Check Scale and a Closed Shell
OBJ does not declare reliable units. See how millimetres are assumed, when mesh volume is only an approximation, and why OBJ is not a CAD solid.
Read the guide →File formatsSTEP vs STL: CAD Measurement, Geometry and Accuracy
STEP and STL serve different jobs. Learn what changes when surfaces become triangles and which checks belong in a CAD handoff.
Read the guide →