.STEP File Extension
Universal 3D CAD exchange format for solid model geometry and assembly structure.
application/step
23 49 53 4F 2D 31 30 33 30 33 2D 32 31 (#ISO-10303-21)
Format Architecture & Technical Specifications
STEP (Standard for the Exchange of Product Model Data, ISO 10303) is a neutral 3D CAD exchange file format designed to facilitate interoperability between different mechanical CAD systems like SolidWorks, CATIA, Inventor, and Creo.
How to Open .STEP Files
1 Open in FreeCAD
Launch FreeCAD and select File > Import > .step file.
2 View in eDrawings
Double click .step file in eDrawings Viewer to inspect 3D assemblies and cross sections.
Compatible Software Programs
FreeCAD Parametric Modeler
windows, mac, linux • Free
Autodesk Fusion 360
windows, mac • Free
SolidWorks
windows • Commercial
eDrawings Viewer
windows, mac • Free
Security Considerations & Verification
Text-based CAD boundary representation geometry format. Safe.
- Open STEP file in text editor to confirm HEADER; and END-ISO-10303-21; delimiter blocks exist.
Frequently Asked Questions
What is a .STEP file?
A .STEP file is a ISO 10303 STEP CAD Model associated with CAD & 3D. Universal 3D CAD exchange format for solid model geometry and assembly structure.
How do I open a .STEP file on Windows or Mac?
You can open .STEP files using FreeCAD Parametric Modeler, Autodesk Fusion 360, SolidWorks, eDrawings Viewer. If you do not have native software installed, you can use AnyFileX's free File Identifier or convert .STEP to a standard format in your browser.
Is a .STEP file safe to open?
This format carries a safety rating of Low Risk. Text-based CAD boundary representation geometry format. Safe.
Can I convert a .STEP file to other formats?
Yes! .STEP can be converted to formats such as .STL, .OBJ directly in your web browser.
What should I do if a .STEP file is corrupted or won't open?
If your .STEP file displays an invalid header or signature error, check its magic bytes hex header (23 49 53 4F 2D 31 30 33 30 33 2D 32 31 (#ISO-10303-21)) using AnyFileX's Magic Byte Detector or follow our step-by-step file repair guide.