STP File Extension
STEP 3D CAD Format
- File Type stp
- Popularity
- Application CATIA
- Category 3D Image Files
- Format Text
What is a STP file?
The STP extension is related to STEP 3D CAD Format and is classified in the 3D Image Files category, which contains 618 files.
STP file support extends to various operating systems, including Windows, Mac OS and Linux. If you need to open a STP file, you can use one of 42 programs, such as CATIA, TopSolid and Afanche 3D Viewer.
MIME types
- application/step
Programs that support STP files
Windows
CATIA
TopSolid
AutoCAD
Creo Parametric
TurboCAD- ZEMAX
Autodesk Inventor- CrossManager
Anark Core- INOVATE
- Myriad CAD Viewer
- Xenon
3D Object Converter
Autodesk 3ds Max- TransMagic
- Alibre Design Professional
- EnSuite
Solid Edge- VariCAD
SolidWorks- Autodesk Fusion 360
IronCAD
Keyshot
Cadwork 3D- BobCAD-CAM Mill
- DipTrace
PolyTrans- Autoconverter
- CAD Exchanger
- ViaCAD 2D
- CINEMA 4D File Converter
- Surfcam
- AnyCAD Exchange3D
ViaCAD Pro
3D-Tool- KeyCreator
- Parasolid
ArtiosCAD- ViaCAD 2D/3D
Online Services
How to open a STP file?
If you’re having difficulty opening a STP file, it is often due to not having the correct software. To solve the problem, choose a compatible program from the list. Then follow the link to the official developer site, download the software, and install it on your device.
Thanks to their popularity, CATIA, TopSolid and Afanche 3D Viewer are often the go-to programs for managing STP files. If you need the newest version of CATIA, just access the Dassault website. From there you can download the installer compatible with all systems.
Once the process is complete, CATIA should take over as the default application for STP files.
Set CATIA as the default STP program
Change Default Program on Mac
- Right click or Control + left click on the desired STP file;
- Choose "Open in Application" and click "Other";
- At the bottom of the window, you will find the "Enable" menu. Default, will be set to "Recommended Programs";
- Choose "All Programs" in this menu and search for CATIA. Check the box next to "Always open in app" to make it the default program.
Change a default app in Windows
- Start by right-clicking on your STP file, then select "Open With" and continue by clicking "Choose another app" from the options provided;
- In the pop-up window, select the CATIA application;
- Check the "Always use this application" checkbox, and then click "OK" to apply the selected application as the default for opening STP files.
Solve problems with STP files
Rest assured, any issues with STP files can typically be addressed with simple software adjustments. See the tips below for help.
What can lead to sudden CATIA crashes?
Insufficient software updates can contribute to CATIA crash. To avoid this, make sure that you have installed the latest updates for Dassault products.
Restarting your computer will solve many common problems, which is why it’s the first thing you should do before changing any settings related to the software.
What is the recommended approach to repair a damaged STP file?
Open the damaged STP file in a recovery program and select the "Repair" menu item to start the repair operation. Wait for the recovery process to finish, allowing automatic repair of damaged 3d image files.
What are the methods to detect if my STP file has been corrupted?
Characteristics of corrupted STP 3d image files can include:
- Unexplained STP file size inflation;
- The file stops responding or freezes in CATIA or other programs;
- The file does not respond or shows errors when opening it;
- While working with the file, error alerts are encountered;
- Editing the archive in CATIA is hampered by poor overall performance;
How to edit a STP file?
To modify STP files, you need to install special software that makes it possible to open and edit 3d image files. Online STP editors are more restricted compared to software designed for STEP 3D CAD Format.
Best STP Editor Software in 2026
Based on the criteria above, here is a selection of STP editors you can use.
| STP Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| CATIA | Dassault | Windows | 4.9 out of 5 (46 reviews) |
| ZEMAX | ZEMAX Development | Windows | 4.8 out of 5 (41 review) |
| AutoCAD | Autodesk | Windows, Mac OS | 4.4 out of 5 (41 review) |
| TurboCAD | IMSI Design | Windows, Mac OS | 4.3 out of 5 (41 review) |
| Creo Parametric | Parametric | Windows | 4.2 out of 5 (39 reviews) |
| TopSolid | TopSolid | Windows | 4.1 out of 5 (41 review) |
Convert files to and from STP
If handling a STP file is problematic, consider converting it to alternative formats such as DXF, DWG, JPG, PNG, OBJ or other supported types.
After converting a STP file, some capabilities may be limited, but you can often convert it back to the original format.
Offline software, including CATIA, Creo Parametric and TurboCAD, allows smooth conversion of STP files while preserving original quality.