Any simple way to convert dwg to pdf without autocad on PC?

To convert DWG to PDF, Think of LibreDWG as a "building block" rather than a finished app. It's an open-source C library (a set of code) designed for developers to build their own DWG-handling tools. It comes with some pre-built command-line utilities like dwg2dxf and dwgread that you can use, but you'll be working in the terminal.

Technically yes, the library is capable of generating PDF files. However, in practice, most users and guides focus on intermediate steps. The most common workflow is to first use LibreDWG to convert DWG to a more universally accepted format like DXF or SVG.

For example, there's a tool called dwg2dxf that converts DWG to DXF. From there, you can open that DXF in other free software to finally export it as a PDF.

You should know that LibreDWG has a reputation for being a "work in progress" and might have trouble with some DWG files. In fact, the FreeCAD documentation lists LibreDWG as an option but notes that it "lacks support for several DWG entities, and may not always give faithful results". Sometimes, it might even crash on a file that another program opens perfectly.

But if you just want a straightforward way to convert DWG to PDF without Autocad, you might be better off looking at something like LibreCAD. They have real graphical interfaces and, while not always perfect, are generally considered more reliable for this kind of conversion job.