Post-processing / Support for CAD programmes / Conversion to dxf
The export formats available for stromlaufplan.de are *.svg and *.pdf. Both formats contain vector information, in other words both contain the positions (and colours and thicknesses) of the various lines and texts (instead of simply generating an image with pixels).
Depending on the CAD program you are using, it can import both the *.PDF or *.svg natively and then create an editable file. The free programme ‘Inkscape‘, for example, allows you to import and edit *.svg files.
If this is not sufficient, a large number of other (CAD) programmes can be integrated via the *.dxf format. stromlaufplan.de does not support this format natively, but you can find various online and offline tools on the Internet for converting PDFs to *.dxf. The quality varies depending on how much time and effort the provider has put in.
For myself, I use: https://www.pixelplanet.com/de/pdfgrabber/ with great success.
You can download a trial version to try it out, a lifetime licence costs (at the time of writing) 99€.
The programme converts the wiring diagram PDF files into *.dxf files in very high quality.