Both .w4a and .aac files are audio (songs) typically without any form of DRM protection, so nothing prevents you from converting one to another or vice versa. As far as we know, a w4a to aac conversion should be even possible directly in iTunes from the library.
Home > Search converters: w4a to aac
Conversion of w4a file format to aac file format beta
Search for w4a to aac converter or software able to handle these file types.
Convert Audio data to Advanced audio coding stream file.
We have found 2 software records in our database eligible for .w4a to .aac file format conversion.
Microsoft Windows software 
- convert w4a to aac on Windows
Apple iTunes for Windows
Multimedia file manager and library for Apple users
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from w4a file | No | No | No | No | No | Yes | No | No |
to aac file | Yes, Apple iTunes for Windows supports aac file conversion as a target file type. | No | No | No | No | No | No | No |
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 w4a to aac. 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 w4a to aac on OS X
Apple iTunes for Mac
Program used to organize and plays your digital music and video
Additional links: Open w4a file, Open aac file
W4A
A w4a file extension is associated with the Apple iTunes and used for audio data.
AAC
An aac file extension is associated with the Advanced audio coding file format (AAC) that provides audio encoding with better sound quality and compression ratio than older formats, such as mp3 or ogg.
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