What are STEP files and how to open them

Are you having problems opening a STEP file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a STEP file?

Files with the .step extension are usually 3D model files created in the STEP file format. STEP stands for Standard for the Exchange of Product Data. This ISO standard exchange format is used to distribute 3D data files (such as CAD files) in a format that can be viewed by a variety of software applications. The .step file extension is interchangeable with the .stp file extension.

The .step file extension is also used for PyDDR files.

How to open STEP files

Important: Different programs may use files with the STEP file extension for different purposes, so unless you are sure which format your STEP file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested ten different STEP openers which you will find listed below.

Last updated: January 16, 2023

Various apps that use files with this extension

These apps are known to open certain types of STEP files. Remember, different programs may use STEP files for different purposes, so you may need to try out a few of them to be able to open your specific file.

eDrawings RapidFire LiteeDrawings RapidFire LiteVerified
IDA-STEPIDA-STEPUser submitted
MastercamMastercamUser submitted
STP ViewerSTP ViewerUser submitted
ABViewerABViewerUser submitted
3D-Tool3D-ToolUser submitted
VariCAD ApplicationVariCAD ApplicationUser submitted
RhinocerosRhinocerosUser submitted
Moment of InspirationMoment of InspirationUser submitted

Help us help others helps thousands of users every day, and we would love to hear from you if you have additional information about STEP file formats, example files, or compatible programs. Please use the links below or email us at to discuss further.