You can convert PUB files to PDF using the Microsoft Publisher software itself or use the free online Publisher to PDF converter tool.

As an alternative, ask the PUB file sender to convert the file in his Publisher program before he sends it. He can change the file to a PDF or XPS file within Publisher before he sends it to you.

You can either convert your files directly within Microsoft Publisher or use a third-party conversion tool, like the FreeConvert website.