Convert MID to AIFF — Free Online Converter
Convert Standard MIDI (.mid) to Audio Interchange File Format (.aiff) online for free. Fast, secure audio conversion with no watermarks or registratio...
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How to Convert
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 .aiff file when it's ready.
About MID to AIFF Conversion
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.
Why Convert MID to AIFF?
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.
Common Use Cases
- Rendering MIDI compositions as uncompressed audio for mixing and mastering in Logic Pro
- Creating archival-quality audio captures of MIDI performances with specific SoundFont configurations
- Preparing MIDI arrangements as AIFF stems for film scoring workflows on macOS
- Converting MIDI demo tracks to uncompressed audio for professional studio handoff
- Generating high-fidelity AIFF files from MIDI for sample library creation
How It Works
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.
Quality & Performance
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 Compatibility
| Device | MID | AIFF |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
Spotify
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Apple Music
Resolution: N/A
Bitrate: 256 kbps
AAC format required
SoundCloud
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Podcast
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
Tips for Best Results
- 1Render at 48 kHz 24-bit if the AIFF will be used in further studio production — this preserves maximum headroom for processing
- 2Use a SoundFont with natural room reverb baked into the samples for more realistic piano and orchestral MIDI renderings
- 3Normalize the rendered AIFF output to -1 dBFS before delivery to ensure consistent loudness
- 4Keep the original MIDI file alongside the AIFF render — MIDI allows re-rendering with different SoundFonts later
- 5Trim silence from the beginning and end of the AIFF output, as synthesizers sometimes add pre-delay or release tails
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.