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 OpenAnyFile'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 OpenAnyFile's Magic Byte Detector or follow our step-by-step file repair guide.

CAD & 3D • MIME: application/step

.STEP – ISO 10303 STEP CAD Model

Universal 3D CAD exchange format for solid model geometry and assembly structure.

Primary Category CAD & 3D

MIME Type application/step

Magic Bytes Signature 23 49 53 4F 2D 31 30 33 30 33 2D 32 31 (#ISO-10303-21)

Security Risk Rating Low Risk

Recommended Software to Open .STEP

FreeCAD Parametric Modeler

windows, mac, linux • Free

Autodesk Fusion 360

windows, mac • Free

SolidWorks

windows • Commercial

eDrawings Viewer

windows, mac • Free