Convert RIFF MIDI (.rmi) to Waveform Audio (.wav) online for free. Fast, secure audio conversion with no watermarks or registration.
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RMI (RIFF MIDI) and WAV (Waveform Audio) are siblings in the RIFF container family — both use Microsoft's Resource Interchange File Format as their structural foundation. RMI stores MIDI performance instructions within RIFF chunks, while WAV stores uncompressed PCM audio samples. Converting between them stays within the RIFF family while fundamentally transforming the content from musical instructions to rendered audio waveforms.
This conversion extracts the MIDI data from the RMI's RIFF structure, synthesizes it through a software synthesizer with a SoundFont bank, and stores the resulting PCM audio in a WAV container — the sister RIFF format. The output is uncompressed, master-quality audio suitable for any professional audio workflow.
WAV is the universal uncompressed audio format accepted by every DAW, audio editor, video editor, and professional tool ever made. Converting RMI to WAV produces a master-quality render that can serve as the source for all subsequent format conversions. Starting with WAV, you can later encode to MP3, AAC, FLAC, OGG, or any other format without accumulating generation loss.
Since both RMI and WAV are RIFF containers, the conversion stays within Microsoft's binary framework — the output inherits WAV's universal compatibility while shedding RMI's Windows-only limitation. WAV files play on every operating system and device, unlike the Windows-exclusive RMI format.
FFmpeg reads the source RIFF container with 'RMID' form type and extracts the MIDI data chunk. The MIDI event stream is dispatched to a software synthesizer — note-on events trigger velocity-scaled sample playback from SoundFont instrument patches, program changes select instruments, and controllers manage dynamics (volume, pan, expression, sustain). The rendered stereo PCM is written into a new RIFF container with 'WAVE' form type, using fmt (format description: sample rate, bit depth, channels) and data (raw PCM samples) chunks. Both source and output are RIFF containers, but with entirely different content types.
WAV stores uncompressed PCM — the encoding step introduces zero quality loss. Every sample from the synthesis output is preserved exactly as rendered. The quality equation depends entirely on the SoundFont. RMI files were designed for the Microsoft GS Wavetable Synth, which produces a characteristic sound. A matching SoundFont recreates that character; a different SoundFont produces different timbres. WAV captures whichever result the synthesizer produces with perfect fidelity.
| Device | RMI | WAV |
|---|---|---|
| Windows PC | Partial | Native |
| 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
RMI to WAV converts between RIFF siblings — from MIDI instructions to uncompressed audio. This is the foundational conversion for any professional use of legacy Windows MIDI content.
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| Native |
| Funktion | RMI | WAV |
|---|---|---|
| Fullstandigt namn | RIFF MIDI | Waveform Audio File Format |
| Filandelse | .rmi | .wav |
| Bast for | RIFF container | Lossless quality |