I have always had access to the PDF Writer from Adobe, which installs as a print driver and lets you print anything to a PDF file.
If you can't go that route (and Adobe is rather expensive) you might try just searching the Internet for "PDF Generator." You can find a number of commercial tools that are available for a nominal fee.
Or you could take a look at Michael Marcavage's SearchDomino.com tip, "Creating PDF documents from Lotus Notes" in which he describes a way to use the iText Jar file within Lotus Notes.
I have not run across any LotusScript code to create .PDF files, but SanFace has a tool called txt2pdf for which you can download the source. Converting it to LotusScript should not be too difficult.
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This was first published in April 2007