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, AMF and glTF/GLB models in an interactive WebGL viewer with orbit, orthographic or perspective projection, a wireframe topology overlay, an orientation cube, triangle count, bounding box, surface area and volume. glTF 2.0 and binary GLB scenes are parsed natively - the node graph is flattened, mesh geometry shown, and the authoring tool, version and mesh/material/animation counts read. 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. Wavefront material libraries (MTL) are broken out into each material with its colours, shininess, opacity and the texture files it references.
- 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.