Convert Standard MIDI (.mid) to Audio Interchange File Format (.aiff) online for free. Fast, secure audio conversion with no watermarks or registration.
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MID (Standard MIDI File) is a compact music notation format that encodes performance instructions — notes, timing, dynamics, instrument assignments — rather than audio data. Developed by the MIDI Manufacturers Association in 1983, MIDI files are typically 10-100 KB because they describe musical events, not sound waves. A synthesizer or sound library must interpret these instructions to produce audible music.
AIFF (Audio Interchange File Format) is Apple's uncompressed audio standard, storing raw PCM data at full resolution. Converting MID to AIFF renders the MIDI performance through a software synthesizer and captures the resulting audio as uncompressed PCM in the AIFF container. This produces the highest-fidelity capture of the synthesized output, preserving every detail of the rendering.
MIDI files sound different on every device because each synthesizer interprets the instructions differently. Converting to AIFF creates a permanent, uncompressed recording of one specific rendering. This is ideal for archival, professional editing, and mastering workflows where lossy compression is unacceptable.
AIFF is the standard uncompressed format in Apple's professional audio ecosystem — Logic Pro, GarageBand, and Final Cut Pro all natively support it. Rendering MIDI to AIFF provides a perfect source for further processing, mixing, or mastering without any compression artifacts.
FFmpeg decodes the MIDI file by parsing the SMF header (format type, tempo map, PPQN resolution) and dispatching events to a software synthesizer. The synthesizer processes note events against loaded SoundFont instrument patches, applying velocity scaling, ADSR envelopes, and effects (reverb, chorus) defined in the SoundFont presets. The resulting PCM audio — typically 16-bit or 24-bit at 44.1 kHz or 48 kHz — is written into an AIFF container using the PCM big-endian format native to AIFF.
AIFF stores uncompressed PCM, so the encoding step introduces zero quality loss. The entire quality equation depends on the synthesizer and SoundFont. A premium SoundFont with multi-velocity samples, release triggers, and natural reverb produces studio-quality results. The basic General MIDI bank produces recognizably digital, mechanical-sounding output. AIFF faithfully preserves whatever the synthesizer produces, including its imperfections.
| Device | MID | AIFF |
|---|---|---|
| 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 AIFF captures a MIDI rendering as uncompressed PCM — the highest-fidelity format for professional audio work on Apple platforms. The synthesizer quality determines the musical result; AIFF preserves it perfectly.
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| No |
| Tính năng | MID | AIFF |
|---|---|---|
| Tên đầy đủ | Standard MIDI File | Audio Interchange File Format |
| Phần mở rộng | .mid | .aiff |
| Phù hợp nhất cho | Musical performance data | Lossless quality |