Add your files
Drop one MP3 or two hundred. Batch conversion is not a paid feature here.
Convert MP3 to M4A
A library is being standardised on AAC for Apple devices, or a specific app rejects MP3 files.
Runs on your deviceFreeNo sign-upBatch supported
Audio is re-encoded on your device. The engine downloads once, then works offline.
Waiting for files/Engine: on-device/Network requests made: 0
What actually changes
MP3 and M4A are not the same picture in two wrappers.
The MP3 is decoded and re-encoded as AAC inside an M4A container.
Worth knowing first
AAC is a better codec than MP3, but that does not help here: you are encoding from an already lossy source, so the result is at best as good as the MP3 and usually slightly worse. The gain is compatibility with Apple software, not fidelity.
Questions
MP3 to M4A, answered
Should I re-rip instead?
If you still have the CD or the lossless master, yes. Encoding from the original always beats transcoding.
Does M4A support gapless playback?
Yes, and better than MP3, which relies on encoder-specific headers that not every player reads.
How to convert MP3 to M4A
01
02
Choose your settings
MPEG-4 Audio is lossy, so the quality control decides the trade between size and fidelity.
03
Download
Instant, because the file never went anywhere. Nothing expires, since nothing was stored.