M4A MPEG-4 audio (AAC)
Apple's usual audio format, used by iPhone Voice Memos, iTunes and many recorders. It sounds better than MP3 at the same size, but some older players, car stereos and upload forms only accept MP3.
Audio · Windows 10 and 11
iPhone Voice Memos, iTunes downloads and many recorders save M4A. Some players, car stereos and upload forms only take MP3.
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Apple's usual audio format, used by iPhone Voice Memos, iTunes and many recorders. It sounds better than MP3 at the same size, but some older players, car stereos and upload forms only accept MP3.
The most compatible audio format: every phone, car stereo, speaker and app plays it. MP3 makes small files by discarding sound you're unlikely to hear, so it suits listening, not editing.
Questions
Songs bought since 2009 have no copy protection and convert fine. Old protected .m4p files can't be converted.
Not noticeably. Converting between lossy formats loses a little, but at this quality it's very hard to hear.
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