What is the MKA file format?
.mka is an audio container file belonging to the Matroska family, used to store audio tracks independently of any video stream. A single .mka file can hold multiple audio tracks that can be selected during playback, along with embedded chapters and cover art. .mka files can be opened directly with audio playback applications such as VLC, foobar2000, and mpv.
Matroska is a free, open-standard multimedia container format built on EBML (Extensible Binary Meta Language). Its name is derived from "Matryoshka", a Russian wooden doll which opens to expose another smaller doll inside and so on. The .mkv and .mka formats appeared in late 2002 and quickly gained fans thanks to the modularity the container format offered. .mka tracks can be divided into chapters and accessed directly by seek index. The format supports codecs from lossy AAC and Opus to lossless FLAC, making it well suited to audiobooks, concerts, and lossless music archives.
Security & safety
RISK: LOWMKA files contain audio data, not executable code, so the file itself is low risk. The realistic dangers are adjacent: pirated-music downloads disguised as 'codec installers', .mka.exe double-extension executables, and scam 'MKA codec packs' that bundle adware. VLC and mpv need nothing extra to play MKA - never install a codec a website demands. Keep players updated.
Format details
in a nutshellFULL NAMEMatroska Audioaka Matroska Audio file, MKA audio container
DEVELOPERMatroska.org (open-source project, started by Steve Lhomme)since 2002 (Matroska family); EBML standardized as IETF RFC 8794 (2020), Matroska as RFC 9559 (2024)
CATEGORYAudio Files
MIME TYPEaudio/x-matroska
TYPEEBML-based multimedia container, audio-only (binary)
STANDARDOpen · royalty-free
MAGIC BYTES · FILE SIGNATURE
OFFSET
00010203
HEX
1A45DFA3
ASCII
·E··
Identical EBML header to MKV/WebM; distinguish by the DocType element ("matroska") and the absence of any video track - only audio (and optional subtitle/attachment) tracks are present.
Programs that open MKA files
Windows4 apps
VLC media player
Open-source Right-click the MKA - Open with - VLC. Plays any codec inside; switch tracks from the Audio menu. 
Foobar2000
Free Drag the file into the playlist; excellent for lossless audio, chapters and replaygain. 
MKVtoolnix
Open-source Not a player - the official Matroska toolkit to inspect, split and remux MKA tracks (mkvextract pulls codecs out). 
mpv
Open-source Drag & drop or 'mpv file.mka'; minimal high-quality player, cycle audio tracks with '#'. 
macOS2 apps
VLC media player
Open-source Drag the MKA onto VLC. The built-in Music app and QuickTime cannot open MKA. 
Linux2 apps
VLC media player
Open-source Available in every distro repo: 'vlc file.mka' or open it from the file manager. 
Android1 app
VLC for Android
Open-source Install from Google Play, open the file from the Audio tab or a file manager.
iOS1 app
VLC for iOS
Open-source Transfer the MKA via Files/AirDrop and play it in VLC - the built-in iOS player does not support MKA. Technical details
deep spec| Container structure | EBML (Extensible Binary Meta Language) - a hierarchical binary format with typed, length-prefixed elements |
| MIME type | audio/x-matroska (also audio/matroska) |
| Magic bytes | 1A 45 DF A3 at offset 0 (EBML header); DocType element set to "matroska" distinguishes it from WebM |
| Byte order | Big-endian |
| Supported audio codecs | Lossy: AAC, MP3, Opus, Vorbis, AC-3, DTS; Lossless: FLAC, ALAC, WavPack, uncompressed PCM |
| Audio track limit | No fixed limit - a single file can contain practically unlimited simultaneous audio, subtitle, and attachment tracks |
| Sample rate / bit depth | Up to 192 kHz / 24-bit or higher for lossless codecs; 8-48 kHz typical for lossy; multi-channel up to 7.1+ supported |
| Chapter support | Named chapters with start/end timestamps for direct navigation, defined in the Chapters element |
| Embedded metadata | Structured Tags element covering title, artist, album, track number, date, genre, and custom fields; cover art via attachments |
| Seek index | Cues element maps timestamps to byte offsets, enabling sub-second random access in large files without sequential scanning |
| Integrity checking | Optional per-element CRC-32 via EBML CRC-32 element; no whole-file hash |
| Content encryption | Optional per-track Content Encryption defined in the spec; rarely used in practice |
| Typical file size | 1 MB - 200 MB, ranging from a single compressed track to a full lossless concert or audiobook |
| Subtitle / lyrics support | Subtitle tracks (SRT, ASS/SSA, PGS, VobSub) can be muxed alongside audio inside the same .mka file |
| Platform support | Windows, macOS, Linux, Android, iOS - natively supported by VLC, mpv, foobar2000, and MKVToolNix |
| Released | 2002 (Matroska family); EBML standardized as IETF RFC 8794 (2020), Matroska as RFC 9559 (2024) |
| Latest version | Matroska v4 element specification (RFC 9559, 2024) |
| Open standard | Yes · royalty-free |
| Specification | www.matroska.org |
MKA conversions
Possible
.MKA .MP3GUIDE
Yes, MKA converts to MP3 without trouble -- the fastest method on any platform is one FFmpeg command: ffmpeg…
How to convert
.MKA .WAVGUIDE
Yes - FFmpeg converts MKA to WAV in one command and handles any codec stored inside the container.
How to convert
.MKA .FLACGUIDE
Yes - converting MKA to FLAC works on every OS; FFmpeg does it in one command and is the fastest route.
How to convert
.MKA .MKVGUIDE
Yes -- MKVToolNix or FFmpeg can combine an MKA audio file with a video track into an MKV in seconds without…
How to convert
.MKA .M4AGUIDE
Yes - FFmpeg converts MKA to M4A in one command and is the fastest reliable method on every OS.
How to convert
Community Q&A
asked by usersNo questions yet - be the first to ask about MKA files.
Frequently asked questions
What is an MKA file?
It is a Matroska audio container - the audio-only version of MKV. It can hold one or several audio tracks plus chapters, cover art and tags in one open, royalty-free file.
How do I play an MKA file?
Open it in VLC media player (free, every OS) or mpv. On Windows foobar2000 is great for lossless audio. The built-in Windows, macOS and iOS music apps usually cannot.
How do I convert MKA to MP3?
Use VLC's Media - Convert/Save, or FFmpeg: 'ffmpeg -i in.mka -b:a 192k out.mp3'. If the MKA already contains an MP3 track it can be extracted without re-encoding.
What's the difference between MKA and MKV?
Same container, different content: MKV carries video (plus audio/subtitles), MKA carries audio only. They share the identical EBML structure and magic bytes.
Why won't my car stereo or phone play MKA?
Most consumer devices only recognise MP3/AAC/FLAC, not the Matroska container. Convert the MKA to MP3 or FLAC for broad compatibility.
Is MKA lossless?
It depends on the codec inside. MKA can hold lossless audio (FLAC, ALAC, PCM) or lossy (MP3, AAC, Opus). The container itself does not compress or degrade audio.
References
1IETF RFC 9559 - Matroska Media Containerwww.rfc-editor.org
2IETF RFC 8794 - Extensible Binary Meta Language (EBML)www.rfc-editor.org
