Convert MID to WAV — Free Online Converter

MID (Standard MIDI File) stores musical performance as data — note events, velocities, timing, instrument assignments, pitch bends, and controller messages — in a compact binary format from 1983. MIDI is not audio; it is a set of instructions that a synthesizer interprets to produce sound. Files are typically 10-100 KB because they encode performance data, not sound waves.

WAV (Waveform Audio File Format) stores uncompressed PCM audio — raw digital samples at full resolution with no compression or data loss. Converting MID to WAV renders the MIDI performance through a software synthesizer and captures the complete audio output as uncompressed PCM. This produces the purest possible capture of the synthesis, preserving every sample for professional use.

WAV is the universal uncompressed audio format accepted by every DAW, audio editor, video editor, and professional tool. Rendering MIDI to WAV provides a master-quality audio file suitable for mixing, mastering, further processing, or archival. No audio data is compressed or discarded.

WAV is also the safest choice when you do not know the final delivery format. Starting with a WAV render, you can later encode to any lossy or lossless format (MP3, AAC, FLAC, OGG) without accumulating generation loss. WAV serves as the intermediate master from which all other formats are derived.

FFmpeg parses the MIDI file's SMF structure — header chunk with format type (0/1/2), time division (PPQN or SMPTE), and track chunks with delta-time-stamped events. Events are dispatched to a software synthesizer that loads SoundFont instrument patches and renders note-on triggers with velocity-scaled amplitude through ADSR envelopes, processes real-time controllers (volume, pan, expression, sustain, modulation), and mixes all 16 MIDI channels to stereo PCM at the target sample rate. The raw PCM is written into a RIFF WAV container with fmt and data chunks.