VideoPad can export its own projects (*.vpj) in many multimedia formats, including the 3GP, and its variants.
Convert VideoPad video editor project to Multimedia files for wireless networks.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert vpj to 3gp on Windows
A video editing software for Windows
Convert from vpj file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.