MKV to MP3
MKV files usually carry more than one soundtrack — the original language, a dub, a commentary. This extractor lists every one of them with its language and codec so you take the one you meant, and it never uploads the film to do it.
MKV to MP3
Every soundtrack listed by language. Pick one, take it out.
Starting the extractor…
The reason this page exists
Matroska was designed to hold everything at once, and films use that: an English original, a German dub, a director's commentary, sometimes a descriptive audio track for blind viewers. Almost every online converter opens the file, takes audio stream zero and hands it back. When stream zero is the commentary, you get the commentary.
Here every audio stream in the file is read out of the container's own headers and listed for you — language, codec, channels, bitrate — and nothing runs until you have chosen. It is the same information a media player shows in its audio menu, and it is exactly what a converter needs to stop guessing.
What is usually inside an MKV, and what it means for you
| Soundtrack | Where it comes from | Extracting it |
|---|---|---|
| AC-3 / E-AC-3 | DVD, Blu-ray and broadcast sources | Re-encoded to MP3; often 5.1, and folded down to stereo on the way |
| DTS | Blu-ray rips | Re-encoded; same 5.1 fold-down |
| AAC | Web sources and re-encodes | Copies untouched into M4A |
| FLAC | Concert and archival rips | Copies untouched into FLAC — nothing lost at all |
| Opus / Vorbis | WebM-sourced material | Copies untouched into .opus or .ogg |
Surround sound becomes stereo
A 5.1 AC-3 track has six channels. MP3 can hold two, so extracting one means a downmix: the centre channel — which carries the dialogue — is mixed into both sides, and the surrounds are folded in behind it. FFmpeg does this with the standard coefficients, so the result is the same downmix a stereo TV or a pair of headphones would produce. Dialogue stays audible; the spatial placement is gone, because stereo has nowhere to put it.
If you want the surround mix preserved exactly, FLAC is the format to ask for: it keeps every channel and every sample, at roughly half the size of the uncompressed equivalent.
Large films
A two-hour MKV can be several gigabytes and that is not a problem for the extraction itself, because the picture is never decoded — the extractor walks the container and pulls out the audio packets. The limit is around 2 GB, where the WebAssembly build's file addressing gives out. Above that, a desktop FFmpeg is the right tool, and the command is on this site too.
Step by step
Open the MKV
Films are large; that is fine here, because the video is read in slices and the picture is skipped entirely rather than being loaded into memory.
Choose the soundtrack
Each one is listed with its language tag, codec, channel layout and bitrate. The one the file marks as default is preselected.
Extract
MP3 for compatibility, or FLAC if the track is lossless and you want to keep everything.
About MKV files
How do I get the English track out of an MKV with several languages?
Open the file here and the soundtracks are listed with their language tags — eng, deu, fra and so on — along with the codec and bitrate. Pick the one you want before extracting. If the tags are missing, the order usually follows the film's own audio menu.
Learn more: Extract audioCan I extract 5.1 surround from an MKV?
You can keep all six channels by choosing FLAC. MP3, M4A and AAC are stereo formats here, so a 5.1 track is folded down to stereo with the standard downmix — dialogue stays clear, spatial placement does not survive.
Learn more: Keeping the originalWhy does VLC give me a 4 KB file when I try this?
Because VLC's Convert dialog defaults to a profile whose settings do not match the track, and it writes a header with nothing behind it. The guide walks through the settings that work.
Learn more: With VLCGet it on your phone
Your videos are usually on the phone already, and moving one to a laptop to get the sound out is the slowest part of the job. The app converts them where they are — offline, with no browser involved.
- Converts straight from the camera roll or Files
- MP3, M4A, AAC and WAV at 64–320 kbps
- Works with no signal — nothing is uploaded there either
- Twelve audio tools: cutter, fade, speed, pitch, equalizer, denoise and more
Free to install with one free conversion, then a subscription for unlimited use. One video at a time — the queue on this website is the place for a folder of them. 4.6 out of 5 from 41 ratings on the App Store, read on 19 September 2026.