Audio to M4A
Convert audio to AAC inside an M4A container.
Add audio
MP3, WAV, M4A, OGG, FLAC, OPUS — or a video to pull audio from.
Choose an output
Convert audio to AAC inside an M4A container.
Fine-tune
Optional — sensible defaults are already set.
About Audio to M4A
M4A is an MPEG-4 audio file, usually containing AAC, and it is the native format for Apple Music, iTunes and iPhone voice memos. This tool encodes your audio as AAC at the bitrate you choose and wraps it in an M4A container with proper seeking and metadata support.
When it helps
- Adding songs to Apple Music or the iPhone Music app in Apple's preferred format
- Shrinking a WAV or FLAC file for a phone while keeping better quality per kilobyte than MP3
- Preparing audiobooks or lectures for players that handle M4A well
Tips
- AAC is more efficient than MP3: around 128 to 160 kbps AAC sounds comparable to a higher-bitrate MP3 for most music.
- For voice-only content, 96 kbps is usually enough.
- Pick M4A over raw .aac when you want reliable seeking and compatibility with Apple software; the raw AAC stream is better for a few tools that specifically ask for it.
Good to know
Quick answers about audio to m4a in your browser.
AAC is the codec; M4A is the MPEG-4 container that holds it. An .aac file is a bare AAC stream, while .m4a adds an index and tag support, which is why Apple software prefers it.
At the same bitrate AAC usually sounds a little better, especially below 160 kbps. MP3 still wins on compatibility with very old hardware.
Yes. There is no sign-up, no watermark and no limit on how many files you process.
No. Files are read and processed locally in your browser, so they never leave your device.
Related tools
Part of the Audio Converter collection.