Add your MKV file
Drop one or more .mkv files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
MKV to ALAC
Pulling the soundtrack out of a .mkv video into .alac audio keeps what you can hear and drops the picture entirely. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop MKV files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting Matroska video to Apple Lossless audio
Pulling the soundtrack out of a .mkv video into .alac audio keeps what you can hear and drops the picture entirely. An .mkv file uses the Matroska container, an open format designed to hold an unlimited number of video, audio, and subtitle tracks in one file. Collectors of high-quality rips and archival copies favor .mkv because it keeps every language track, chapter marker, and font attachment together.
ALAC, the Apple Lossless Audio Codec, compresses music with zero quality sacrifice, and the .alac extension is occasionally used to label such files explicitly even though the codec normally travels inside an .m4a container. Decoding reproduces the original samples exactly, making it Apple's counterpart to FLAC. For this route the practical draw is native on every Apple platform from iOS to HomePod and mathematically lossless reconstruction — balanced against compresses slightly worse than FLAC on average, which is worth knowing before you commit a large batch.
Why convert MKV to ALAC?
The usual reason to take .alac audio out of a .mkv file is that only the sound matters — a talk, interview, song, or podcast segment. Keeping the video stream would waste storage, and a dedicated audio file is easier to trim, tag, and play. On the source side, safari and iOS refuse the container outright; on the target side, the payoff is native on every Apple platform from iOS to HomePod, which is exactly what you want for building a lossless library that syncs cleanly to iPhones and the Music app.
MKV vs ALAC at a glance
| Aspect | Matroska video (.mkv) | Apple Lossless audio (.alac) |
|---|---|---|
| Format type | Container — quality depends on the codecs and settings inside | Lossless — every pixel or sample is preserved exactly |
| How it stores data | built on EBML, a binary XML-like structure that lets the container gain features without breaking older parsers | linear-prediction compression conceptually similar to FLAC, typically reaching 40 to 60 percent of PCM size |
| Strongest at | archiving discs while preserving every audio track and subtitle stream | building a lossless library that syncs cleanly to iPhones and the Music app |
| Weak spot | safari and iOS refuse the container outright | compresses slightly worse than FLAC on average |
| Metadata | matroska tags cover title, cast, and arbitrary key-value pairs, and the container can embed cover art and other files as attachments | inherits the full iTunes metadata atom set from its MPEG-4 container, including artwork, composer, and grouping fields |
Pick ALAC as the output
Select .alac in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if ALAC is selectable, the route is real and validated.
Convert on your device
Press Convert. A WebAssembly FFmpeg build demuxes the audio track and re-encodes it locally; the video stream is simply discarded.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid ALAC file. Outputs keep the original filename with the .alac extension.
MKV to ALAC questions, answered
Will converting MKV to ALAC lose quality?
Since mkv is container-oriented and alac is lossless-oriented, the conversion preserves the source content exactly as stored; no additional compression pass is applied beyond what .alac itself requires.
Is it private to convert MKV files here?
Yes — the .mkv file is processed inside your browser tab and never uploaded. A WebAssembly FFmpeg build demuxes the audio track and re-encodes it locally; the video stream is simply discarded. Close the tab and the file is gone from memory.
Where will the ALAC file work?
Every Apple device and application plays ALAC natively, and cross-platform players such as VLC and foobar2000 handle it on Windows, Linux, and Android. Outside the Apple world support varies by player, which is why cross-platform archives still tend to favor FLAC.
Will the ALAC file be bigger or smaller than my MKV?
Much smaller — the video stream is usually 80–95% of a .mkv file's weight, and it is discarded entirely. The remaining audio is re-encoded at the bitrate implied by your quality setting.
What happens to the metadata in my MKV file?
This converter strips container metadata deliberately (the FFmpeg command runs with metadata mapping disabled) so exported files do not leak recording details. In the source, matroska tags cover title, cast, and arbitrary key-value pairs, and the container can embed cover art and other files as attachments; none of it is transmitted anywhere because the file never leaves your browser.