MP4 to M4A Converter Online Free

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MP4 to M4A in detail

The underlying audio codec is AAC, identical to what the MP4 to AAC tool produces. The difference is the container: M4A wraps the AAC stream in Apple-flavored ISO Base Media File Format chunks with metadata fields that iTunes and Apple Music recognize, including cover art, track number, album name, composer, and lyrics. A raw .aac file lacks this metadata support; an .m4a file has it natively.

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. M4A at 256 kbps is also what iTunes Plus and Apple Music use for their catalog, so matching that encoding profile produces files that slot cleanly into an existing library.

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.
iTunes Plus quality	256 kbps VBR	Matches Apple's catalog encoding.
Metadata support	Full ID3-style tagging	Album art, track, composer, lyrics, and more.
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.

AirPods Max playback

M4A streams over Bluetooth with minimal quality loss to AirPods and HomePod through AAC native codec pass-through.

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 256 kbps AAC in an M4A container, which matches iTunes Plus and Apple Music catalog quality. 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 MP4 to FLAC tool or the advanced extractor with ALAC output.

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 for Apple ecosystem compatibility. Raw `.aac` files are the codec stream with minimal container; M4A adds metadata support and broader ecosystem recognition, particularly in Apple software.

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 full ID3-style metadata. This tool produces a base M4A with minimal metadata; 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.

100% Private: Your Video Never Leaves Your Device

Audio extraction runs locally in your browser using FFmpeg compiled to WebAssembly. Your video file is read from disk into browser memory, decoded, re-encoded to the output format, and the result is saved back to your device. No network request is made during extraction, no data is transmitted, and no server ever sees your footage.

MP4 to M4A Converter