Convert Matroska Video (.mkv) to MPEG-4 Audio (.m4a) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .mkv file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .m4a file when it's ready.
M4A is an MPEG-4 audio container that typically holds AAC or ALAC audio streams, widely supported across Apple, Android, and Windows devices. Extracting audio from MKV to M4A produces a feature-rich audio file that supports metadata, chapters, album art, and gapless playback — advantages that raw AAC or MP3 files lack.
M4A is the preferred audio format for iTunes, Apple Music, and Apple Podcasts because it supports the full range of metadata Apple's ecosystem expects: artwork, lyrics, chapter markers, and podcast episode information. If you are extracting audio from MKV recordings for distribution through Apple's platforms, M4A is the correct output format.
Compared to MP3, M4A with AAC encoding delivers noticeably better audio quality at the same bitrate, especially at lower bitrates below 128 kbps. The M4A container also supports gapless playback, which is critical for live albums, classical music, and DJ mixes where silence between tracks ruins the listening experience.
FFmpeg extracts the audio from the MKV container and either stream-copies existing AAC audio directly into the M4A container (if the MKV already has AAC) or transcodes from the source codec to AAC using libfdk_aac or the native encoder. The M4A container is technically an MP4 file with only audio streams, identified by the .m4a extension. Metadata tags are mapped from the MKV using FFmpeg's metadata handling, including title, artist, album, track number, and embedded cover art.
When stream-copying AAC from MKV, quality is identical to the source. When transcoding, AAC at 256 kbps in M4A is transparent for music, and 128 kbps is transparent for speech. The M4A container itself introduces no quality impact — it is purely a wrapper for the audio bitstream.
| Device | MKV | M4A |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
MKV to M4A extraction creates versatile audio files with rich metadata support that integrate perfectly with Apple's ecosystem and play well everywhere else.
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Fungerar overallt
| No |
8MB free, 50MB Nitro
Valfri webblasare, valfri enhet
| Funktion | MKV | M4A |
|---|---|---|
| Fullstandigt namn | Matroska Video | MPEG-4 Audio |
| Filandelse | .mkv | .m4a |
| Bast for | Multiple audio tracks | Better than MP3 |