STL file: How can I open a .STL file?
The table below provides useful information about the .stl file extension. It answers questions such as:
- What is the .stl file?
- What program do I need to open a .stl file?
- How can the .stl file be opened, edited or printed?
- How can I convert .stl files to another format?
We hope you find this page helpful and a valuable resource.
✅ Macromedia Fireworks Style Library

The STL file is a Macromedia Fireworks Style Library.
✅ StereoLithography Data

The STL file is a StereoLithography Data. STL is a file format native to the stereolithography CAD software created by 3D Systems.
✅ EBU-STL Standard Subtitle File

The STL file is an EBU-STL Standard Subtitle File. EBU STL is a standardized subtitle exchange format.
✅ ZX Spectrum Stellar Bitmap

The STL file is a ZX Spectrum Stellar Bitmap. The ZX Spectrum is a home computer created by Sinclair Research Ltd in U.K. in 1982.
✅ Spruce DVD Studio Pro Subtitle Data

The STL file is a Spruce DVD Studio Pro Subtitle Data. DVD Studio Pro is a discontinued dvd authoring software tool published by Apple Inc.
✅ Win2020 Subtitle Data

The STL file is a Win2020 Subtitle Data. Win2020 is a discontinued software used to create screen subtitles.
✅ Micrografx Designer Stylesheet

The STL file is a Micrografx Designer Stylesheet. Micrografx Designer is a vector-based graphics program. It was originally developed by Micrografx, which was bought by Corel in 2001.
✅ SuperTux Level Data

The STL file is a SuperTux Level Data. SuperTux is a classic 2D jump'n run sidescroller game in a style similar to the original Super Mario games covered under the GPL.
✅ SPEFO Stellar Spectra Analysis Data

The STL file is a SPEFO Stellar Spectra Analysis Data. SPEFO is a small program used for processing stellar spectra at the Astronomical Institute of the Academy of Sciences of the Czech Republic in Ondrejov.
✅ ROSE Online 3D Model Data

The STL file is a ROSE Online 3D Model Data. ROSE Online (Rush On Seven Episodes Online) is a Massively Multiplayer Online Role-playing Game (MMORPG).
✅ Visual Studio C++ Standard Template Library

The STL file is a Visual Studio C++ Standard Template Library. Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft.
✅ ClarisWorks STL Data

The STL file is a ClarisWorks STL Data. ClarisWorks is an integrated office application, which provides word processing, graphics, illustration, spreadsheet, charting/graphing, presentation and database capabilities.
✅ Certificate Trust List

The CTL file is a Certificate Trust List. A CryptoAPI CTL is a list of items that has been signed by a trusted entity.
⚠ Be careful with .stl files.
It's important to know that the .stl file extension can be used by various programs, not just the ones you expect. This includes potentially harmful software or malware that might create .stl files. Be cautious when dealing with .stl files from unknown sources.
🚫 The .stl file extension is often given incorrectly!
According to the searches on our site, these misspellings were the most common in the past year:
Is it possible that the filename extension is misspelled?
We found the following similar file extensions in our database:
🔴 Can't open a .stl file?
When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:
Select an app to open this .stl file
It means that the operating system does not have a default app associated with the .stl file type. To resolve this issue and open the file, you can take the following steps:
- Right-click on the .stl file. A context menu will appear.
- From the context menu, select Open with. Windows will display a list of recommended apps.
- If the desired app is listed, select it from the provided options.
- If you cannot find the appropriate app, you may need to install software that supports the specific file type.
If you don't know how to change the default app for the .stl file, check the FAQ.
🔴 Can I change the extension of files?
Changing the filename extension of a file is not a good idea. The extension of a file serves as a hint to the operating system and various software programs about the type of data contained within the file. When you alter a file's extension, you essentially modify how software applications interpret and handle that file. Every file has a specific format, also known as its file type or file format. The problem is, changing the file extension does not change the file format.
If you have helpful information about the .stl file extension, write to us.