STL File Extension
Stereolithography Format
- File Type stl
- Popularity
- Application TurboCAD
- Category CAD, CAM and CAE Files
- Format Binary
What is a STL file?
The STL extension is related to Stereolithography Format and is classified in the CAD, CAM and CAE Files category, which contains 148 files.
STL file support extends to various operating systems, including Windows, Mac OS and Linux. If you need to open a STL file, you can use one of 51 programs, such as TurboCAD, Creo Parametric and AutoQ3D.
MIME types
- application/sla
Programs that support STL files
Windows
TurboCAD
Creo Parametric
Cura Software
CATIA
SolidWorks
CloudCompare
3D Builder
Meshlab
Pro/ENGINEER- Mimics
Autodesk 3ds Max- IVCon
OpenSCAD
ViaCAD Pro
3D-Tool- DeskProto
SketchUp- CopperCube
- TransMagic
Mathematica- MEDUSA4
- T-FLEX CAD
3D Object Converter- Mystic Fractal Firefly
- EnSuite
IronCAD- SketchUp STL
- STL2GBR
- Autoconverter
PolyTrans- ACE 3000
- Rapidform Explorer (Geomagic Verify Viewer)
- Alibre Design Professional
3D Coat- AccuTrans 3D
- EasyWOOD
- CrossManager
- meshconv
- MakeHuman
Autodesk Inventor- CAD Exchanger
- GLC_Player
- Metasequoia
- AnyCAD Exchange3D
Mac OS
How to open a STL file?
If you’re having difficulty opening a STL 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, TurboCAD, Creo Parametric and AutoQ3D are often the go-to programs for managing STL files. If you need the newest version of TurboCAD, just access the IMSI Design website. From there you can download the installer compatible with all systems.
Once setup is done, your operating system should assign TurboCAD as the default app for STL files.
Setting TurboCAD as default STL viewer
Change the default app for a file type in Mac
- Initiate a right click or use Control + left click on the desired STL file to open a menu where you can select various actions;
- Choose "Open in Application" and click "Other";
- Scroll down to the bottom of the window, where you will find the "Enable" menu. Default, "Recommended Programs" will be selected;
- In this menu, choose "All Programs" and navigate to TurboCAD. 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 STL file, then select "Open With" and continue by clicking "Choose another app" from the options provided;
- Choose TurboCAD from the available applications listed in the pop-up window to set it as the default application to open your STL file;
- Be sure to check the "Always use this app" checkbox, and then click "OK" to confirm your selection.
Tips and tricks to solve problems with STL files
If you encounter issues with STL files, don’t worry—most can be fixed with minor software adjustments. Refer to the troubleshooting tips below.
What can lead to sudden TurboCAD crashes?
Insufficient software updates can contribute to TurboCAD crash. To avoid this, make sure that you have installed the latest updates for IMSI Design products.
Restarting your computer is an essential troubleshooting step that can resolve many common problems. It is recommended to restart your computer before making any changes to the software settings.
What is the recommended approach to repair a damaged STL file?
Open the damaged STL file in a recovery program and select the "Repair" menu item to start the repair operation. Allow the recovery process to complete, which will automatically repair the damaged cad, cam and cae files.
What are the methods to detect if my STL file has been corrupted?
Characteristics of corrupted STL cad, cam and cae files can include:
- Unexplained STL file size inflation;
- TurboCAD or other programs stop responding or crash when trying to handle the file;
- When opening the file, errors occur or the inability to access its contents;
- While working with the file, error alerts are encountered;
- Editing the archive in TurboCAD is hampered by poor overall performance;
How to edit a STL file?
To modify STL files, you need to install special software that makes it possible to open and edit cad, cam and cae files. Online STL editors are more restricted compared to software designed for Stereolithography Format.
Best STL Editor Software in 2026
Following these criteria, we have put together a list of recommended STL editors.
| STL Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| CATIA | Dassault | Windows | 4.8 out of 5 (44 reviews) |
| Pro/ENGINEER | Parametric | Windows | 4.8 out of 5 (42 reviews) |
| Creo Parametric | Parametric | Windows | 4.7 out of 5 (38 reviews) |
| Meshlab | Meshlab project | Windows, Mac OS, Linux | 4.7 out of 5 (38 reviews) |
| 3D Builder | Microsoft | Windows | 4.6 out of 5 (44 reviews) |
| AutoQ3D | AutoQ3D Team | Mac OS | 4.5 out of 5 (37 reviews) |
| TurboCAD | IMSI Design | Windows, Mac OS | 4.5 out of 5 (40 reviews) |
| CloudCompare | Girardeau-Montau | Windows, Mac OS, Linux | 4.4 out of 5 (37 reviews) |
| SolidWorks | SolidWorks | Windows | 4.3 out of 5 (43 reviews) |
| Clara.io | Exocortex | Online Services | 4.1 out of 5 (44 reviews) |
Convert files to and from STL
If handling a STL file is problematic, consider converting it to alternative formats such as DXF, DWG, JPG, JPEG, PNG or other supported types.
After converting a STL file, some capabilities may be limited, but you can often convert it back to the original format.
IVCon, 3D Object Converter and Autoconverter are offline tools that convert STL files to other formats seamlessly and without quality loss.