Convert RMI to iPhone Audio — Free Online Converter
Convert RIFF MIDI (.rmi) to iPhone Audio (.iphone-audio) online for free. Fast, secure audio conversion with no watermarks or registration....
Secure Transfer
HTTPS encrypted uploads
Privacy First
Files auto-deleted after processing
No Registration
Start converting instantly
Works Everywhere
Any browser, any device
How to Convert
Upload your .rmi 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 .m4a file when it's ready.
About RMI to iPhone Audio Conversion
RMI (RIFF MIDI) stores MIDI performance data within a RIFF container, a format native to Windows multimedia APIs. iPhone Audio is a device-optimized preset producing AAC or M4A files tuned for Apple's iPhone hardware. Every iPhone since the original 2007 model includes a dedicated AAC hardware decoder, and modern A-series chips (A14 Bionic and later) decode AAC in their always-on audio processing unit with near-zero battery impact.
Converting RMI to iPhone Audio synthesizes the MIDI performance, encodes to AAC, and wraps it in an M4A container that iOS recognizes natively. The output plays in Apple Music, Voice Memos, iMessage, and every iOS audio application without additional codecs or apps.
Why Convert RMI to iPhone Audio?
iOS does not recognize the .rmi extension or RIFF MIDI containers. Even standard MIDI playback on iPhone uses Apple's built-in synthesizer, which varies in quality across iOS versions. Converting to iPhone-optimized AAC creates a definitive audio rendering with consistent quality on every iPhone model.
The iPhone's AAC hardware decoder operates in a separate low-power audio subsystem, consuming a fraction of the battery that software-decoded formats (FLAC, OGG) require. For background music playback, this hardware optimization translates to measurably longer battery life — critical for mobile users.
Common Use Cases
- Playing legacy Windows MIDI compositions on iPhone without synthesizer inconsistencies
- Converting RIFF MIDI notification sounds for iPhone custom alert tones
- Migrating Windows-era MIDI music libraries to iPhone-compatible AAC format
- Preparing MIDI-based audio content for iOS app distribution through M4A delivery
- Rendering RIFF MIDI compositions for sharing via iMessage and AirDrop
How It Works
FFmpeg strips the RIFF envelope, synthesizes the enclosed MIDI via FluidSynth, and encodes to AAC-LC at 256 kbps in an M4A container. The encoding profile targets Apple's hardware AAC decoder — LC profile, 44.1 kHz stereo. For iPhone ringtones, the output can be trimmed to 40 seconds and renamed to .m4r. The container uses Apple-compatible ftyp atoms for seamless iOS file handling.
Quality & Performance
At 256 kbps AAC-LC, the encoding is transparent for all synthesized MIDI content. Apple's hardware decoder reproduces the AAC bitstream with reference-grade accuracy. The quality ceiling is set by the SoundFont — a professional-grade bank produces results that are indistinguishable from hardware synthesizer output through iPhone speakers and AirPods alike.
Device Compatibility
| Device | RMI | iPhone Audio |
|---|---|---|
| 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
- 1Use 256 kbps AAC-LC for transparent quality with hardware decode acceleration on all iPhone models
- 2For ringtones, trim to exactly 40 seconds and change extension from .m4a to .m4r
- 3Add metadata and cover art for proper display in iOS Music app and Control Center
- 4Encode at 44.1 kHz stereo for the standard iPhone audio pipeline
- 5Preview on AirPods to verify the rendering quality through the most common iPhone audio output
RMI to iPhone Audio delivers consistent, battery-efficient playback of legacy Windows MIDI on every iPhone. Hardware AAC decoding ensures maximum battery life without quality compromise.