The Four Best Ways to Open STL Files

The first way you should always try to open file extension STL is to double-click it, but when that doesn’t work, there are a few other things you can try. There are lots of programs that can open different file extensions, and there are some simple ways you can tell which one to use.

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Pick the Right Program

Start by choosing the right program to open your STL file. A few of the most common programs used to open STL files are listed below. One of them should be able to open your STL file.

  • SPEFO Stellar Spectra Analysis File
  • Win2020 Screen Subtitle
  • Micrographics Designer Stylesheet
  • EBU-standard Open and Teletext File
  • Claris Works Data File
  • Certificate Trust List
  • CAD Software Solid Modeling/Prototyping File
  • Fireworks Style Library
  • C++ Standard Template Library

Note the File Type

Other programs may be able to open your STL file, depending on the type of file it is. You can find the file type listed in the file’s properties. On a Windows PC, right-click the file, click "Properties", then look under “Type of File.” On a Mac computer, right-click the file, click “More Info,” then look under “Kind”.

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Tip: If it’s the STL file extension, it probably falls under the Web Files type, so any program used for Web Files should open your STL file.

Ask the Developer

Contacting the software developer is another easy way to get help opening a STL file. You can find the developers for the most common programs used to open STL files in the list below.

Software Developer
SPEFO Stellar Spectra Analysis File Unknown
Win2020 Screen Subtitle Screen Subtitling Systems
Micrographics Designer Stylesheet Windows Programmer
EBU-standard Open and Teletext File SoftNI Corporation
Claris Works Data File Windows Software
Certificate Trust List Windows Programmer
CAD Software Solid Modeling/Prototyping File Unknown
Fireworks Style Library Macromedia
C++ Standard Template Library Unknown

Use a Universal File Viewer

When all else fails, a universal file viewer is the best way to open a STL file. Programs like File Magic (Download) can open many different types of files, depending on the format. Although, some files may not be compatible with these programs. If your STL file isn’t compatible, it will only open in binary format.


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1File types that are unsupported can be opened in binary format.

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