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MKA to MP3
Turn Matroska audio files into MP3s that play in every car stereo, phone and music app
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Any codec inside MKA: FLAC, Opus, Vorbis, AAC, AC-3, DTS and PCM tracks are all decoded by FFmpeg before encoding to MP3.
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LAME encoder, 192 kbps: The MP3 is encoded with LAME, the reference MP3 encoder, at 192 kbps, which is transparent for most listeners.
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Tags carried over: Title, artist, album and other Matroska tags are written into the MP3's ID3 tag.
You can upload up to 20 audios simultaneously.
Bitrate
Determines audio quality and file size. Select 'Auto' and we'll automatically pick the best options for your file.
Audio conversion
What happens to an MKA on the way to MP3
MKA is the audio-only flavour of the Matroska container, the same family as MKV. It can wrap nearly any codec, which is why players so often refuse it. The converter decodes whatever is inside and produces an ordinary MP3 file.
How to use Converter App
1
Upload the MKA
Drop the file into the box or pick it from Google Drive. Several files can be converted in one job.
2
Decode and encode
The first audio track is decoded and encoded with LAME at 192 kbps; metadata is copied to ID3.
3
Download the MP3
Play it anywhere, from a 2005 iPod to a current smart speaker.
Key features
Works where MKA does not
MP3 is the one audio format with universal support: car radios, e-readers, game consoles, voice recorders, every browser.
Multi-file jobs
Convert an album of MKA files at once; the MP3s are returned together in a ZIP.
Sample rate preserved
44.1 or 48 kHz sources keep their rate. High sample rates above 48 kHz are reduced to 48 kHz, the maximum MP3 allows.
Private by design
Uploads and results are deleted automatically within two hours and are never listened to or shared.
Experience & privacy
Built for reliable audio conversion.
Backed by 10+ years of engineering expertise in large-scale data and scientific computing, it’s built for real-world workflows that require uncompromised audio quality, accelerated processing speeds, and reliable, high-level performance.
Trusted by Users
Rated 5 stars on Trustpilot for speed, reliability, and ease of use.
User trust
Academic Use
Referenced in published research and used for interview transcription and qualitative data analysis.
Research use
Why Matroska audio files are so hard to play
Matroska was designed as a universal container: it can hold any codec, any number of tracks, chapters, attachments and tags. That flexibility is why MKV became the standard for high-quality video, and why MKA exists for audio. The flip side is that a player needs both a Matroska demuxer and the right decoder for whatever happens to be inside. Phones, car stereos and most music apps have neither, so a file that is technically ordinary FLAC or AAC appears broken. MP3 solves this because every device made since the late 1990s decodes it in hardware or software.
How the conversion works
FFmpeg opens the MKA, selects its default audio track and decodes it to PCM. The samples are then encoded with LAME, the open-source MP3 encoder that produces the best quality per bit of any MP3 implementation, at a constant 192 kbps. Matroska tags are mapped to ID3v2 fields so title, artist, album, track number and year survive. Cover art stored as an attachment is not transferred. The whole process is lossless up to the final MP3 encoding step; there is no intermediate lossy format.
Choosing between MP3, AAC and keeping the original
If the MKA contains lossless audio and you care about archiving, keep the original and treat the MP3 as a playback copy. If it contains Opus or AAC and the only goal is compatibility, MP3 at 192 kbps is the pragmatic choice; AAC in an M4A would be slightly more efficient but is not supported by every older device. For spoken word, 128 kbps would be enough, but we prefer a bitrate that is safe for music too, so you do not have to think about it.
Common sources of MKA files
- Soundtracks extracted from MKV films with MKVToolNix or similar tools.
- Audiobooks packaged by ripping software that preserves chapters.
- Recordings from screen capture or streaming tools that default to Matroska because it survives crashes without corruption.
- Game and anime fan releases that distribute multiple language tracks.
In all of these cases the audio itself is fine; only the wrapper is unusual. After conversion it behaves like any other MP3.
FAQ
Frequently Asked Questions
What is an MKA file?
A Matroska container holding only audio. Ripping tools and media managers such as MKVToolNix produce it when extracting the soundtrack from an MKV film, and some audiobook and podcast tools use it because it supports chapters and multiple tracks. The audio inside can be anything from FLAC to Opus.
Does the conversion lose quality?
MP3 is lossy, so a lossless FLAC track inside the MKA loses information in theory. At 192 kbps with LAME the difference is inaudible to almost everyone in normal listening conditions. If the MKA already contains a lossy codec such as AAC or Opus, re-encoding to MP3 adds a second small loss; that is unavoidable and still not audible at this bitrate for typical content.
My MKA has several audio tracks. Which one is converted?
One track per file: FFmpeg's default selection, which is the track with the most channels, or the first one when they are equal. If you need a different language or commentary track, extract it first with MKVToolNix (mkvextract) and upload only that track.
Are chapters kept?
No. MP3 has no standard chapter support that players agree on, so chapter markers from the Matroska file are dropped. The audio itself is complete; nothing is cut.
Can I choose a different bitrate?
This page uses 192 kbps, a good balance of size and quality. For audiobooks and podcasts where a smaller file matters, our Compress Audio tool lets you pick lower bitrates; for the highest quality convert to FLAC or WAV instead.
Is DTS or 5.1 surround audio supported?
Stereo and mono tracks in any codec convert directly. MP3 can only hold two channels, and this page does not downmix, so a 5.1 DTS or AC-3 track should be downmixed to stereo first, for example in Audacity or with ffmpeg's -ac 2 option, and then converted here.