What is a .STP file?
STP is the same standard CAD exchange format as STEP, for precise 3D solid models.
- Did you know
- STP is just STEP under its short extension - the ISO 10303 CAD exchange standard, published in 1994.
- STP and STEP are the same format under different extensions, both encoding the ISO 10303-21 “STEP Physical File” in clear, readable text.
- The data is structured against an EXPRESS schema named in the file header, which tells software exactly how to interpret each entity.
- Because STP stores precise solid geometry rather than a triangle mesh, it is the go-to neutral format for moving parts between rival CAD systems.
- STP files routinely carry full assemblies, including part hierarchies and, under the richer application protocols, colours and manufacturing tolerances.
- What Analyser shows you
- View STL, OBJ, PLY, OFF, STEP, IGES, BREP, 3MF and AMF models in an interactive WebGL viewer with triangle count, bounding box, surface area and volume. STEP/IGES/BREP are tessellated with OpenCASCADE and STEP shows its originating CAD system, version and AP203/214/242 protocol; 3MF and AMF let you inspect each model and assembly on the build plate individually.
- Open a .STP file
- Drag a .STP file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.