MKA to MP3 Converter

An .mka file is usually the soundtrack of a movie or a concert pulled out of an MKV, and it can hold surround sound in codecs that phones and car stereos never learned. Converting to MP3 decodes whatever is inside and folds it into a stereo file that plays everywhere.

or drop MP3, WAV, M4A … files here ·

Max 95 MB per file· Up to 20 files· Deleted after 30 minutes

Output

Convert to

Bitrate

Files are processed on our servers and deleted after 30 minutes.

How to use this tool

1
Upload the .mka files
Add up to 20 files, up to 95 MB each. Long lossless soundtracks can exceed that; see the size tips below.
2
Keep stereo and 256 kbps
Channels is set to stereo so 5.1 and 7.1 tracks are downmixed, and Bitrate is 256 kbps, which suits film music and dialogue. Lower it to 128 kbps for talk-only content.
3
Convert to MP3
Press Convert to MP3. Download the files one by one or in a ZIP.

Answer

How do I convert an MKA file to MP3?

Upload the .mka and press Convert to MP3. The audio codec inside is decoded, surround is downmixed to stereo, and a 256 kbps MP3 comes back, ready for any phone or player.

What an MKA file is and where it comes from

Matroska is an open container format whose first release came out in 2002. The .mkv extension is the video version, .mka the audio-only version, and Google's WebM format, launched in 2010, is a restricted profile of the same structure. Because Matroska accepts almost any codec, any number of tracks, chapters and attachments, it became the favorite format for ripping Blu-ray discs and DVDs.

That is also why .mka files turn up: tools such as mkvextract from MKVToolNix pull a soundtrack out of an MKV without re-encoding, so the audio keeps the movie's original codec. You get a file with film-grade sound that only a few desktop players open. If what you have is still the whole video, extracting the audio straight to MP3 with MP4 to MP3 or a similar page skips the middle step.

EBMLMatroska's binary markup: Extensible Binary Meta Language, the binary structure Matroska is built on. It works like a compact binary XML, which is why the format can add new elements such as new codecs or chapter types without breaking older players.

MKA to MP3 converter: what each codec inside becomes

Common audio codecs found in .mka files
Codec in the MKA	Typical source	Result as MP3
AC-3 / E-AC-3 (Dolby Digital)	DVD and streaming rips, 5.1	Downmixed to stereo; 192–256 kbps is plenty
DTS / DTS-HD	Blu-ray rips, 5.1 or 7.1	Downmixed to stereo; 256 kbps keeps the detail
Dolby TrueHD	Blu-ray lossless tracks	Downmixed; files are large, split before upload
FLAC	Concert rips, lossless remuxes	256–320 kbps keeps most of the quality
Opus or Vorbis	Web and anime releases	Match or exceed the source bitrate
AAC	Re-encoded TV rips	Second lossy pass; use 256 kbps

Converting from a lossy track twice

AC-3, DTS core, AAC, Opus and Vorbis are already lossy. Turning them into MP3 adds a second generation of loss, which is usually inaudible at 256 kbps but noticeable at 128 kbps or below on music. Keep the original .mka if you may need another format later.

MKA and MP3 compared

MKA

Matroska audio

MKA is the audio-only form of the Matroska container, first released in 2002. It can hold almost any audio codec, including FLAC, AAC, Opus and Dolby formats, along with chapters, tags and multiple tracks. MKA files often come from extracting audio from MKV videos. Phones, browsers and many music apps do not open MKA.

Compression: Lossy or lossless
Transparency: –
Animation: –
Introduced: 2002 · Matroska project

MKA converter

MP3

MP3 audio

MP3 (MPEG-1 Audio Layer III) is a lossy audio format developed largely at the Fraunhofer Institute and standardised by MPEG in 1993. It removes sounds the ear is unlikely to notice, shrinking music to about a tenth of CD size at 128–320 kbps. All patents have expired, and every phone, car stereo, browser and media player supports it. Quality loss is audible at low bitrates and accumulates with re-encoding.

Compression: Lossy
Transparency: –
Animation: –
Introduced: 1993 · Fraunhofer IIS / MPEG

MP3 converter

MKA files come from ripped films, concert videos and MKV extractions and often carry AC-3, DTS or FLAC surround tracks that phones, car stereos and music apps cannot open; MP3 gives that soundtrack a stereo form any player accepts.

MKA to MP3: frequently asked

Why won't my phone or music app open an .mka file?

Mobile music apps and most car stereos recognize a short list of extensions, and Matroska audio is not on it. Even when the codec inside is something they know, such as AAC or FLAC, the container stops them. VLC and some desktop players open MKA, but MP3 works on all of them.

What happens to 5.1 surround sound?

MP3 holds at most two channels, so the converter downmixes: the center dialogue channel and the surround channels are blended into left and right. Speech stays intelligible and music keeps its balance, but the spatial effect is gone. Keep the .mka if you also watch on a surround system.

My MKA has several audio tracks. Which one is converted?

The converter uses the file's default audio track, normally the main language. To convert a commentary or a second language, extract that track to its own .mka first with the free MKVToolNix tools, then upload it.

Are chapters and track names kept?

No. Matroska chapters and per-track names have no place in an MP3, so the result is one continuous file. Use Start at and End at to cut out a single song or scene and convert it separately.

My .mka is larger than 95 MB. What can I do?

Lossless soundtracks in FLAC or Dolby TrueHD grow quickly; a two-hour film can be over a gigabyte. Split the file into parts with MKVToolNix by time or chapter and upload the parts. The audio converter takes up to 20 files per batch.