About MKA Files
Matroska Audio
MKA is the audio-only Matroska container supporting any audio codec.
Family
Audio Files
Extension
.mka
MIME Type
audio/x-matroska
Can Use As
HOW MKA
CAME TO BE.
MKA — Matroska Audio — is the audio-only sibling of MKV. When the Matroska project released the first public versions in 2002, they split the extension space by content type: .mkv for video+audio, .mka for audio-only, .mks for subtitle-only. The container structure is identical — EBML-tagged elements nested like Russian dolls — just restricted to audio tracks.
MKA never gained mainstream traction. FLAC already covered the lossless audiophile niche; MP3/AAC owned lossy; Ogg Vorbis won the "patent-free container" slot. MKA stuck around for the same reason MKV did: flexibility. A single MKA can hold multiple audio tracks (different languages, commentaries), lossless and lossy streams side by side, with chapter markers, cover art, and metadata. It’s popular in anime audio releases and multitrack music distribution — niche but alive.
CURIOSITIES &
TRIVIA.
MKA can hold multiple audio tracks in one file — same as MKV but audio-only. Great for multi-language albums or commentary mixes.
The Matroska container supports virtually any audio codec: FLAC, Opus, Vorbis, AAC, MP3, even DTS-HD or TrueHD.
Music albums with chapter markers per song can use MKA to bundle FLAC tracks + artwork + lyrics in one file.
MKA is the audio-only cousin to both MKV (video) and MKS (subtitles) — all share the Matroska EBML container.
Anime fan-releases sometimes use MKA to bundle a show's entire soundtrack (OP, ED, OST) with chapter markers per track.
STRENGTHS &
LIMITATIONS.
Strengths
- Holds any audio codec — universal container.
- Multiple audio tracks in one file.
- Chapter markers, attachments, metadata.
- Open standard, patent-free.
Limitations
- Limited hardware support — most audio players don't recognize MKA.
- Streaming services never adopted it.
- Overshadowed by FLAC for lossless and AAC for lossy.
- Tooling less mature than MKV.
Typical Sizes & Weights
Single-track FLAC
20-30 MB
Full album FLAC (10 tracks + chapters)
250-400 MB
Multi-language audiobook
500 MB - 2 GB
Technical Specifications
- MIME type
- audio/x-matroska
- Extension
- .mka
- Container
- Matroska (EBML)
- Codecs
- Any audio codec — FLAC, Opus, Vorbis, AAC, MP3, DTS, TrueHD
- Siblings
- .mkv (video), .mks (subtitles), .webm (restricted web subset)
CONVERT FROM
MKA
Common Use Cases
Multi-track audio, archiving
Related Formats
Popular comparisons
MKA vs WAV
Differences, file size, and when to choose each format.
MKA vs AAC
Differences, file size, and when to choose each format.
MKA vs M4A
Differences, file size, and when to choose each format.
MKA vs OGG
Differences, file size, and when to choose each format.
MKA vs OPUS
Differences, file size, and when to choose each format.
MKA vs WMA
Differences, file size, and when to choose each format.
Popular MKA conversions
The most-requested destinations when starting from MKA.
Frequently Asked Questions about MKA
Frequently Asked Questions
MKA (Matroska Audio) is an audio file format used to store sound recordings — music, voice, podcasts, sound effects. The format defines how the audio samples are compressed (or stored raw), what bitrates are supported, and how metadata such as title, artist, album, and cover art is embedded. It is part of the audio files family.
VLC, foobar2000, and the default media players on Windows and macOS handle MKA natively. On mobile, iOS Music and Android media apps vary in their support — popular formats work everywhere; niche ones may need a dedicated app. If playback fails on a device, converting to MP3 or AAC usually solves it.
Upload the MKA to KaijuConverter and pick MP3, WAV, FLAC, AAC, OGG, or any other target. Our FFmpeg pipeline decodes the audio and re-encodes to the target format at sensible default bitrates (VBR ~190 kbps for music, 96 kbps for speech). Metadata and cover art travel with the audio where both formats support them.
MKA can be lossy or lossless depending on the specific variant. Lossy variants (smaller files) discard some audio detail during compression in ways tuned to be inaudible; lossless variants preserve every sample exactly but produce larger files. For distribution, lossy at high bitrate is standard; for archival, lossless wins.