Convert Standard MIDI File (.midi) to MPEG-4 Audio (.m4a) online for free. Fast, secure audio conversion with no watermarks or registration.
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MIDI (.midi) has been the lingua franca of digital music composition for over four decades. Every major DAW, notation editor, and music education platform reads and writes .midi files because the format captures musical intent in a universal, software-agnostic way. A .midi file describes the composition — notes, rhythms, dynamics, orchestration — leaving the sonic realization to whichever synthesis engine plays it. This separation of content from presentation is MIDI's greatest strength and its greatest limitation.
M4A is the audio-only MPEG-4 container format, universally recognized by Apple devices and widely supported across all platforms. Converting MIDI to M4A transforms an abstract musical description into a concrete audio file through software synthesis and AAC encoding. For MIDI composers who want to share their work with listeners — not just other musicians — M4A is the most practical delivery format in the Apple-dominant mobile landscape.
Songwriters and composers who sketch ideas as MIDI in notation software need to share listenable demos with collaborators, producers, and clients who may not have MIDI playback capability. M4A provides a professional audio file that integrates with Apple Messages, AirDrop, email, and every music player. The recipient hears the composer's intended rendering without needing any specialized software.
Podcast creators and content producers who use MIDI-composed intro music, transition jingles, or background scores need these elements as standard audio files. M4A with AAC is the dominant podcast audio format — Apple Podcasts, Spotify, and most podcast hosting platforms accept M4A natively, making it the natural target for MIDI-composed podcast audio elements.
The .midi file is parsed to extract its complete event timeline, including System Exclusive (SysEx) messages that may configure synthesizer-specific parameters beyond the General MIDI specification. FFmpeg's synthesis engine interprets the standard events: note-on/off with velocity, program change, pitch bend (14-bit resolution from LSB+MSB), channel aftertouch, and all standard MIDI continuous controllers (CC0-CC127). The stereo PCM output is encoded using AAC-LC with the specified bitrate and wrapped in an M4A container (MPEG-4 audio with ftyp atom set to M4A) including proper sample table entries and edit list atoms for gapless playback.
M4A with AAC at 256 kbps is the standard Apple Music delivers content at — more than sufficient for synthesized MIDI audio. The SoundFont is the decisive quality factor. For songwriting demos, a piano-focused SoundFont with realistic hammer action, sympathetic resonance, and una corda response can sell a composition to a producer. For podcast jingles, a punchy, bright SoundFont with tight transients cuts through speech better than a soft, ambient one. Choose the SoundFont for the use case, not just for general quality.
| Device | MIDI | M4A |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| 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
MIDI to M4A is the composer-to-listener pipeline for the Apple-centric world. It turns musical notation into shareable audio that plays everywhere Apple devices are found.
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| No |
| الميزة | MIDI | M4A |
|---|---|---|
| الاسم الكامل | Standard MIDI File | MPEG-4 Audio |
| الامتداد | .midi | .m4a |
| الأفضل لـ | Musical data format | Better than MP3 |