Audacity projects (.aud) can be exported to several audio formats including the MP3. There is no other way how these files could be converted, because they are just projects with settings and do not contain any audio data, just references to them.
Convert Audacity project file to Compressed audio and music file, mp3 songs or ringtones.
We have found 3 software records in our database eligible for .aud to .mp3 file format conversion.
Microsoft Windows software - convert aud to mp3 on Windows
A free, open source software for recording and editing sounds
Convert from aud 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 aud to mp3. 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 aud to mp3 on OS X
A multi-track audio editing tool
Linux/Unix software - convert aud to mp3 on Linux
Multi-track audio editor for Linux