MKV to MP3 Converter
Pull the audio track out of any MKV (Matroska) video file and save it as MP3. The fastest way to grab dialogue, music, or full soundtracks from movie rips, anime episodes, OBS screen recordings, and Matroska video archives.
Drop your MKV file here or click to browse
MKV (.mkv) · Max 20 MB
Free — 10-second preview, 5 conversions/month. Upgrade for unlimited
What is MKV?
Matroska Video container — the most popular open-source video format. Used by movie/show downloads, anime, BD/UHD rips, recording software (OBS), and streaming archives. Extract the audio track without re-encoding the video.
What is MP3?
The most widely used audio format. Great compatibility, small file size. Ideal for music, podcasts, and general use.
Why Convert MKV to MP3?
MKV (Matroska Video) is the most popular open-source video container — used by virtually every movie or TV show rip, every anime release, every OBS Studio recording, and most modern Blu-ray and 4K UHD remuxes. MKV files can hold high-quality audio (DTS, Dolby TrueHD, FLAC, AAC, Vorbis, Opus) alongside video, subtitles, and chapter metadata. The problem: very few audio players, music apps, podcast platforms, or car stereos play MKV files. To get the audio onto a phone, into a music library, or into a DAW, you need to extract it. Converting MKV to MP3 gives you a portable audio file that works everywhere — on your phone, in your car, on a podcast feed, on a website, on any device made in the last 20 years. The conversion is lossy (MKV audio is typically already a high-quality codec that gets re-encoded to MP3) but at 192-256 kbps the output is sonically transparent for nearly all listeners. AudioUtils runs the entire conversion in your browser using FFmpeg compiled to WebAssembly — your MKV file never leaves your device, which matters because movie/show rips often live in a legal gray area you don't want logged on someone else's server.
Who Uses This Converter
Movie soundtracks from Blu-ray rips
Extract the audio track from a movie MKV to create a soundtrack album for personal listening. Convert to MP3 for car audio, MP3 player, or phone library.
Anime music and dialogue
Pull the audio from anime episodes for offline listening — opening songs, ending themes, or full episode audio for re-listening on the go.
OBS screen recording audio
OBS Studio records to MKV by default for crash safety. Extract the audio for podcast clips, tutorial voiceovers, or stream highlights.
Lecture and presentation recordings
Recorded a class, conference talk, or webinar as MKV? Pull just the audio for replay at 2× speed, transcription, or sharing.
Frequently Asked Questions
Can I extract audio from a movie or TV show MKV?
Technically yes — this tool handles any MKV file regardless of source. You should make sure you have the legal right to extract audio from the content (your own ripped Blu-rays, public domain material, or content where you have permission). AudioUtils performs the conversion locally without storing or transmitting your file; we don't see what's in it. The legal responsibility is yours.
What audio codecs are inside MKV files?
MKV is a container, not a codec — the audio inside can be almost anything: AAC (most common for modern content), Vorbis, Opus (newer releases), FLAC (lossless), AC-3 / DTS (movies, surround sound), or even MP3. AudioUtils detects the source codec automatically and re-encodes to MP3 at your chosen bitrate.
Will the audio quality be good?
Yes for most modern MKV sources. Movie and TV MKV files typically use AAC at 256+ kbps or DTS/Dolby at high rates. Converting to MP3 at 192-256 kbps preserves quality for normal listening. If the source has surround audio (5.1 or 7.1), AudioUtils downmixes to stereo MP3 — usable for headphones but loses spatial information.
My MKV has multiple audio tracks — which one gets extracted?
The first audio track in the MKV is extracted by default — usually the primary language for movies and shows. If your MKV has commentary, alternate language, or multi-channel tracks you want specifically, you'll need a desktop tool like MKVToolNix or ffmpeg with stream-mapping flags. AudioUtils handles the common case of one-track extraction.
How big can the MKV file be?
The free tier handles files up to 20 MB. The Pro tier handles up to 500 MB. Most TV episode MKVs are 200-1500 MB and most movie MKVs are 2-30 GB — these are bigger than our limits. For large files, split the MKV or pre-extract the audio with desktop ffmpeg first, then use AudioUtils to encode to MP3 if needed.
How long does extraction take?
Seconds to a couple minutes depending on file size. The conversion strips the video stream entirely (it isn't re-encoded), so the bottleneck is reading the MKV and re-encoding the audio. A 45-min MKV episode typically extracts in under a minute on a modern laptop.
Will my file stay private?
Yes. AudioUtils runs the entire conversion in your browser using FFmpeg compiled to WebAssembly. Your MKV file is read into browser memory, transcoded locally, and written back as a download. Nothing is uploaded to AudioUtils servers. This matters for content you don't want logged or scanned.