Various TeX/Latex document preparation tools usually have support for the PDF format and so TEX documents can be saved as *.pdf files. Other than that, it should also be possible to achieve the same using a TEX viewer and virtual PDF printer where you print the document as PDF instead on paper.
Convert TeX/LaTeX text document to Adobe Portable document format.
We have found 2 software records in our database eligible for .tex to .pdf file format conversion.
Microsoft Windows software - convert tex to pdf on Windows
A document preparation system for high-quality typesetting
Convert from tex 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 tex 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.
A program for creating TeX/LaTeX documents