Convert Standard MIDI (.mid) to Matroska Video (.mkv) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .mid file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mkv file when it's ready.
MID (Standard MIDI File) is a musical notation format that records performance data — notes, velocities, timing, instrument selections — without storing any audio. Created by the MIDI Manufacturers Association in 1983, the format is universally used for electronic music sequencing. MIDI files are remarkably small (10-100 KB) because they encode instructions rather than sound waveforms.
MKV (Matroska Video) is a flexible open-source multimedia container capable of holding virtually unlimited audio, video, and subtitle streams. Converting MID to MKV renders the MIDI performance through a software synthesizer and packages the resulting audio into an MKV container. The output is an audio-only MKV file, leveraging Matroska's excellent codec support and metadata capabilities.
MKV's flexibility makes it useful when the rendered MIDI audio needs to be combined with other media streams later. Video editors can add video tracks to an existing MKV audio file, and subtitle tracks can be muxed alongside. This is valuable for multimedia projects where MIDI provides the soundtrack foundation.
MKV also supports chapter markers, allowing long MIDI compositions to be segmented into navigable sections. For multi-movement MIDI works or medleys, MKV chapters provide structure that pure audio formats like MP3 or FLAC cannot match. MKV is natively supported by VLC, MPV, and most Linux media players.
FFmpeg processes the MIDI file through its built-in decoder and software synthesizer, generating stereo PCM from the MIDI event stream. The PCM audio is then encoded using any codec MKV supports — typically FLAC (lossless), Opus (lossy, high quality), Vorbis, or AAC. The encoded audio is wrapped in Matroska's EBML (Extensible Binary Meta Language) container structure with proper track headers, codec information, and optional chapter and tag elements.
MKV is a container — audio quality depends on the codec chosen for the audio stream. FLAC in MKV provides bit-perfect lossless preservation. Opus at 128 kbps delivers excellent lossy quality. As with all MIDI conversions, the true quality determinant is the SoundFont and synthesizer used for rendering. MKV adds no degradation beyond the chosen audio codec's characteristics.
| Device | MID | MKV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
MID to MKV renders MIDI into a versatile multimedia container ideal for projects where the audio will be combined with video or chaptered for navigation.
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| No |
| Egenskap | MID | MKV |
|---|---|---|
| Fullt navn | Standard MIDI File | Matroska Video |
| Filendelse | .mid | .mkv |
| Best egnet for | Musical performance data | Multiple audio tracks |