RaahUPSC · Video Tools
MKV to MP3
Extract the soundtrack from a Matroska file as an MP3 you can play on a phone or in the car. AC-3, DTS, Opus, FLAC and AAC tracks are all decoded, then folded to stereo for MP3.
✓ No upload · ✓ No sign-up · ✓ No watermark
How to use MKV to MP3
- Choose one or more .mkv files.
- Press Convert to MP3.
- Wait while the audio is decoded and encoded; the video is skipped.
- Download the MP3s individually or zipped.
Dealing with MKV's many audio formats
Matroska can carry nearly any audio codec, including Dolby Digital (AC-3), DTS and lossless FLAC, often in 5.1 surround. Many phones and car stereos cannot play these. The tool decodes the chosen track and encodes stereo MP3 with LAME at VBR quality 2, averaging about 190 kbps.
It is useful for recorded concerts, conference talks, audiobooks packaged as video, or lecture series downloaded in MKV, where only the sound matters. Surround channels, including dialogue in the centre channel, are mixed into left and right so speech stays audible.
Limitations
- When the MKV has several audio tracks, FFmpeg selects one automatically, usually the one with most channels, and you cannot switch to another language.
- Chapters in the MKV are not turned into separate MP3 files.
- Very large MKV files must fit in browser memory; full HD films may fail on phones.
Frequently asked questions
Which audio track is converted from a dual-audio MKV?
FFmpeg's default choice, generally the track with the most channels. If that is the wrong language, remux the MKV with only the track you want first.
Will DTS or AC-3 sound work?
Yes. Both are decoded by FFmpeg and re-encoded as stereo MP3.
Can I get lossless audio from an MKV with FLAC?
Not with this tool, since MP3 is lossy. A WAV or FLAC output would be needed to stay lossless.
Is my MKV uploaded?
No. Decoding and encoding take place in your browser alone.