Tax Return forms can be generally exported to PDF documents, so it is likely that the T12 files can be saved to PDF as well.
Convert H&R Block At Home 2012 tax return file to Adobe Portable document format.
We have found 2 software records in our database eligible for .t12 to .pdf file format conversion.
Microsoft Windows software - convert t12 to pdf on Windows
A popular tax preparation software from HRB Digital
Convert from t12 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 t12 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 t12 to pdf on OS X
A complete a simple federal tax return software