Audio converter
MP4 to M4A Converter
M4A is the Apple-native container format for AAC audio. Technically, an M4A file is an MP4 container with only an audio track inside, and the .m4a extension signals audio-only to Apple ecosystem software. iTunes, Apple Music, Voice Memos, the Podcasts app, Music on Mac, and every iOS audio player treat M4A as a first-class format. Converting MP4 to M4A is the right move when the audio will live in the Apple ecosystem.
MP4 to M4A in detail
The output is the same file the MP4 to AAC page produces: AAC audio in an .m4a container. The container can hold the iTunes-style tags Apple software reads, including cover art, track number, album name, composer, and lyrics. This tool writes none of them, so add tags afterwards in Music or a tag editor.
For users building personal music libraries in iTunes, ripping audio from iPhone video recordings for Voice Memos, or creating podcast episodes for distribution through Apple Podcasts Connect, M4A is the canonical format. The default here is 192 kbps CBR; pick 256 kbps to match the iTunes Plus bitrate so the files sit next to store purchases without standing out.
MP4 to M4A specifics
| Setting | Value | Notes |
|---|---|---|
| Input container | MP4 | Usually already contains AAC audio. |
| Output container | M4A (MPEG-4 Audio) | MP4 container, .m4a extension, audio-only. |
| Codec inside | AAC LC (same as MP4 to AAC) | Codec identical; container differs. |
| Bitrate | 192 kbps CBR default | Pick 256 kbps to match the iTunes Plus bitrate. |
| Metadata support | iTunes-style tags (none written) | Add album art and track info in a tag editor afterwards. |
| Best for | iTunes, Apple Music, Voice Memos, Podcasts | Apple ecosystem workflows. |
When to use this conversion
iTunes library addition
Rip audio from a music video MP4 as a 256 kbps M4A that drops cleanly into the iTunes library next to Apple Music purchases.
Voice Memos import
Convert an iPhone video recording to M4A for import into Voice Memos, which treats M4A as its native format.
Apple Podcasts submission
Produce episodes as M4A for submission to Apple Podcasts Connect, which recommends AAC in M4A containers.
Files app and Podcasts playback
Keep talks or lectures as M4A files that open straight from the Files app or sideload into podcast players on iPhone.
Mac Music app library
Add external recordings to the Music app on Mac as M4A files with proper metadata rather than generic MP3s.
Frequently asked questions
Can I use M4A on iPhone?
Yes. M4A is Apple's native audio format. Every iPhone, iPad, and Mac plays M4A natively without any codec installation. The iOS Music app, Voice Memos, and Podcasts app all treat M4A as a first-class format, whereas MP3 works but is technically legacy from the pre-AAC era.
How do I convert MP4 to M4A for iTunes?
Drop the MP4 onto this tool. The default encoding is 192 kbps CBR AAC in an M4A container; choose 256 kbps if you want the iTunes Plus bitrate. The result is a single `.m4a` file that you can drag directly into iTunes or the Mac Music app to add to your library.
Is M4A lossless?
No, M4A typically contains lossy AAC audio. For lossless Apple-native audio, Apple uses a different format called ALAC (Apple Lossless Audio Codec), which can also live in an M4A container. This tool produces lossy AAC M4A; for lossless extraction, use the Convert Video to FLAC tool.
What is the difference between AAC and M4A?
AAC is the audio codec. M4A is an MPEG-4 container with an `.m4a` extension that wraps AAC audio. On this site both the AAC and M4A pages write the same .m4a file; the pages just describe different use cases for it.
Will M4A play on Android?
Yes. Modern Android devices (Android 4.0 and later) play M4A natively because they understand both the MP4 container and the AAC codec inside. VLC for Android, Google Play Music successors, and most third-party audio apps on Android handle M4A without any configuration.
Can I add album art to the M4A file?
The M4A container supports embedded album art and iTunes-style metadata. This tool produces a base M4A with no tags; to add album art, track numbers, and artist info, import the M4A into iTunes or a tag editor like Kid3 or MP3Tag and edit the fields there. Apple's Music app auto-populates many fields from the filename.
Why do some M4A files end in .mp4 instead?
Some tools output audio-only MP4 containers with a `.mp4` extension, which is technically legal. Apple's software specifically looks for `.m4a` to recognize audio-only files; renaming an audio-only `.mp4` to `.m4a` usually works. This tool outputs `.m4a` directly to avoid the confusion.
Related Tools and Resources
MP4 to AAC
Same output file, written up for web and Android use.
MP4 to MP3
Universal format for non-Apple ecosystems.
MOV to MP3
iPhone MOV recordings to MP3 for broader compatibility.