The only way how *.fmp12 databases from FileMaker Pro could be converted or exported to PDF format is to use the programs default PDF export function or print them as PDFs using a virtual printer installed. No other program seems to be capable of this conversion.
Convert FileMaker Pro database file to Adobe Portable document format.
We have found 2 software records in our database eligible for .fmp12 to .pdf file format conversion.
Microsoft Windows software - convert fmp12 to pdf on Windows
A program used to create and manage information databases
Convert from fmp12 file format
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 fmp12 to pdf. 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.
Apple macOS / Mac OS X software - convert fmp12 to pdf on OS X
A database management program for Mac