Convert MKV to ALAC — Free Online Converter
Convert Matroska Video (.mkv) to Apple Lossless Audio Codec (.alac) online for free. Fast, secure video conversion with no watermarks or registration....
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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.
About MKV to ALAC Conversion
ALAC (Apple Lossless Audio Codec) compresses audio to roughly half its original size without losing a single bit of data. Converting MKV to ALAC extracts the audio and wraps it in an M4A container that Apple devices, iTunes, and Apple Music handle natively, making it the ideal lossless format for the Apple ecosystem.
Why Convert MKV to ALAC?
If you own an iPhone, iPad, Mac, HomePod, or Apple TV and want lossless audio from your MKV video files, ALAC is the only lossless codec guaranteed to play on all Apple hardware without third-party apps. FLAC, by comparison, requires apps like VLC on iOS and is not supported by Apple Music or iTunes for library management.
ALAC also provides meaningful storage savings over uncompressed formats. A typical CD-quality audio track compresses from 10 MB/minute (AIFF/WAV) down to about 5-6 MB/minute in ALAC, saving roughly 40-50% of disk space while remaining mathematically identical to the original when decoded. For users with large music libraries extracted from MKV concert recordings, this savings adds up significantly.
Common Use Cases
- Building a lossless music library in Apple Music from MKV concert recordings
- Extracting studio-quality audio from MKV music videos for an AirPlay listening setup
- Archiving audiobook narrations from MKV recordings in a compressed-but-lossless format
- Delivering final audio masters to clients who use Apple-only workflows
- Syncing extracted lecture audio to iPhone for offline listening without quality compromise
How It Works
FFmpeg decodes the MKV audio stream (any codec) and re-encodes to ALAC using the native alac encoder. The output is packaged in an M4A (MPEG-4 audio) container. ALAC supports sample rates up to 384 kHz, bit depths up to 32-bit, and channel counts up to 7.1 surround. Compression ratios typically range from 40-60% of the original PCM size depending on the audio content's complexity.
Quality & Performance
ALAC is mathematically lossless. Decoding the ALAC file produces bit-identical samples to the decoded MKV source. If the MKV contained lossless audio (FLAC, TrueHD, DTS-HD MA), the ALAC output is a perfect copy. If the MKV had lossy audio, the ALAC preserves that quality level without additional degradation. There is zero generational loss.
Device Compatibility
| Device | MKV | ALAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Use the .m4a extension rather than .alac so that Apple devices and iTunes recognize the file immediately
- 2If the MKV already contains FLAC audio, conversion to ALAC is a transcode between two lossless codecs with zero quality impact
- 3Embed album art during conversion with '-i cover.jpg -map 0:a -map 1 -c:v mjpeg' to include artwork in the M4A file
- 4Set the '-compression_level' flag between 0 (fastest) and 2 (smallest) depending on whether speed or size matters more
- 5Verify lossless integrity after conversion by decoding both source and output to WAV and comparing checksums
Related Conversions
For Apple-ecosystem users who refuse to compromise on audio quality, MKV to ALAC is the definitive extraction path.