Both STL and STEP are fairly common CAD/3D model formats and well supported in many programs, so it should be not hard to find one that can perform stl to step conversion. Any of the software choices listed below should have tools that will allow you to convert stl to step.
Home > Search converters: stl to step
Conversion of stl file format to step file format beta
Search for stl to step converter or software able to handle these file types.
Convert Stereolithography CAD data to ISO-10303 STEP product data.
We have found 17 software records in our database eligible for .stl to .step file format conversion.
Microsoft Windows software 
- convert stl to step on Windows
SolidWorks
A 2D and 3D CAD construction software
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from stl file | No | Yes | Yes | stl editor | No | No | Yes | No |
to step file | No | No | No | No | No | Yes | Yes | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned stl to step. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
CATIA
A PLM/CAD/CAM/CAE software suite
Autodesk Inventor
Autodesk Inventor is modeling application used to create 3D digital prototypes
3D Object Converter
3D viewer and converter with huge file type support
AnyCAD Exchange3D
A 3D model converter
TurboCAD
A family of 2D/3D CAD software products for Windows
3ds Max (3D Studio Max)
A widely-used 3D animation application from Autodesk
Alibre Design Professional
A set of 3D modeling tools
Apple macOS / Mac OS X software 
- convert stl to step on OS X
TurboCAD for Mac
A 2D/3D CAD software for OS X
Multiplatform software 
- convert stl to step on any platform
FreeCAD
An open source multiplatform 3D CAD/MCAD/CAx/CAE/PLM modeler
Additional links: stl file extension details, step file extension details
STL
Files with stl file extension can be mainly found as stereolithography files for 3D printers. Used in many CAD programs as output format for models and prototypes that could be printed in stereolithography devices.
STEP
Files with step file extension are quite often found as 3D model / part files saved in STEP (Standard for the Exchange of Product Data) format.
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