As both the IGES/IGS and STP/STEP are fairly common CAD formats used for exchange purposes, so it should be fairly easy to find a program that can convert one to another. Such igs to stp conversion is likely doable in almost every modern CAD/3D modeling tool.
Home > Search converters: igs to stp
Conversion of igs file format to stp file format beta
Search for igs to stp converter or software able to handle these file types.
Found 2 different conversion types using the same filename extensions.
Conversion igs to stp type 1:
Convert from IGES 3D exchange format to ISO-10303 STEP product data.
Microsoft Windows software 
- convert igs to stp on Windows
CATIA
A PLM/CAD/CAM/CAE software suite
File extension | File type (from-> to) | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|---|
Convert from igs file | IGES 3D exchange format | No | Yes | Yes | igs editor | Yes | Yes | Yes | No |
to stp file | ISO-10303 STEP product data | Yes, CATIA supports stp file conversion as a target file type. | Yes | Yes | stp editor | No | No | 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 igs to stp. 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.
Autodesk Inventor
Autodesk Inventor is modeling application used to create 3D digital prototypes
SolidWorks
A 2D and 3D CAD construction software
AutoCAD
Leading 2D and 3D CAD development software from Autodesk
Creo Parametric
A complete 3D modeling software solution by PTC
TurboCAD
A family of 2D/3D CAD software products for Windows
3ds Max (3D Studio Max)
A widely-used 3D animation application from Autodesk
Autoconverter
A converter for 3D formats
Solid Edge
A feature rich 3D CAD software by Siemens
TopSolid
A suite of CAD applications
Apple macOS / Mac OS X software 
- convert igs to stp on macOS
TurboCAD for Mac
A 2D/3D CAD software for OS X
AutoCAD for Mac
A Mac version of popular Autodesk AutoCAD software
Multiplatform software 
- convert igs to stp on any platform
FreeCAD
An open source multiplatform 3D CAD/MCAD/CAx/CAE/PLM modeler
Additional links: Open igs file, Open stp file
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Conversion igs to stp type 2:
Convert from IGES 3D exchange format to Adobe Acrobat Exchange plug-in.
Microsoft Windows software - convert igs to stp on Windows
MicroStation
A CAD software from Bentley used for 2D and 3D design and drawing
Additional links: Open igs file, Open stp file
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