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The STEP File Format
STEP is the standard neutral format for exchanging exact 3D CAD geometry between different CAD systems.
.step.stpSTEP (ISO 10303)
What is a STEP file?
A STEP file stores solids as exact boundary representations: real cylinders, planes and curved surfaces rather than triangles. A 20 mm hole is stored as a 20 mm cylinder, not an approximation.
STEP files often hold several parts and their assembly structure, along with units and basic colours. The .step and .stp extensions are the same format.
When to use STEP
Good for
- Sending parts to suppliers and machine shops
- Moving designs between CAD programs
- Archiving engineering geometry
Not ideal for
- 3D printing directly (convert to STL)
- Web display and games (convert to GLB)
How to open, edit and create STEP files online
Design
Open it in the CAD editor and add features on top, or design a new part and export STEP.
Convert
Export STEP models as STL, GLB or glTF from Studio or the CAD editor.
STEP compared with other 3D formats
| Format | Geometry | Units | Materials | Animation | Best for |
|---|---|---|---|---|---|
| STEP / STP | Exact solids (B-rep) | Stored | Colours only | No | CAD exchange, manufacturing |
| STL | Triangles | Not stored | No | No | 3D printing |
| GLB | Triangles + scene | Metres | PBR + textures inside | Yes | Web, AR, games |
| glTF | Triangles + scene | Metres | PBR, textures beside | Yes | Web pipelines |
| FBX | Triangles + scene | Stored | Yes | Yes | Game engines, DCC tools |
Related guides: STL vs STEP, Parametric CAD Explained
STEP file questions
What is the difference between .step and .stp?
None. They are two file extensions for the same ISO 10303 format.
How can I open a STEP file without CAD software?
Upload it to VIZON and open it in your browser. No CAD installation is needed.
Can I convert STEP to STL online?
Yes. Open the STEP file in VIZON Studio or the CAD editor and export STL.
Open your STEP file in VIZON
Upload it to your library and open it in the browser, on any computer.