MIDI to WAV Converter — Convert MIDI Files to WAV Audio

Convert MIDI files to uncompressed WAV audio online. Browser synthesizer renders MIDI notes to real WAV audio at 44.1 kHz. Free, private, no uploads required.

Drop your MIDI file here

Supports .mid and .midi files

Turn MIDI Instructions Into Real Audio

MIDI files are not audio — they are musical instructions that require a synthesizer to produce sound. This tool synthesizes those instructions into a full WAV audio file using your browser's Web Audio API. No plugins, no server, no software download needed. Upload a MIDI file and get a standard WAV in seconds.

→
MIDI → WAV

Key Features

Browser-Based Synthesis

MIDI notes are synthesized using the Web Audio API's OfflineAudioContext at CD-quality 44.1 kHz stereo.

Standard WAV Output

Output is an uncompressed RIFF/WAV file that imports into any DAW, audio editor, or media player without conversion.

Multi-Track Support

Handles both Type 0 and Type 1 MIDI files. All tracks are merged into a single audio render automatically.

Fully Private

Your MIDI file never leaves your browser. All parsing, synthesis, and encoding runs locally on your device.

How this MIDI to WAV Converter — Convert MIDI Files to WAV Audio works

MIDI files contain musical instructions — note pitches, timings, and velocities — rather than recorded audio. To produce a WAV file, this tool synthesizes those instructions into actual sound using the Web Audio API inside your browser.

The tool parses the MIDI binary, reading the file header to get track count and time signature, then stepping through each track chunk. It extracts note events, calculates their start times from delta ticks and tempo data, and converts MIDI note numbers to frequencies using the formula 440 Hz × 2^((note−69)/12). Each note plays through an oscillator node in an OfflineAudioContext set to 44.1 kHz stereo — the standard WAV sample rate. An amplitude envelope shapes each note to avoid clicks at note boundaries. Once rendering finishes, the raw PCM audio samples get written into a RIFF/WAV container with the correct chunk headers and byte-order encoding. The resulting WAV file downloads immediately. No network request is made at any point.

How to use this MIDI to WAV Converter — Convert MIDI Files to WAV Audio

1

Upload your MIDI file

Drag and drop a .mid or .midi file into the upload area, or click to browse.

2

Synthesize audio

The tool parses MIDI note events and renders them to audio using the Web Audio API.

3

Download WAV

Once rendering finishes, click Download to save the WAV file to your device.

Example Usage

A 4-track piano MIDI composition synthesized to a CD-quality stereo WAV file ready to import into any audio editor.

Input
piano-composition.mid (Type 1, 4 tracks, 120 BPM, 3 minutes)
Output
piano-composition.wav (stereo, 44.1 kHz, ~30 MB)

Frequently Asked Questions

What is the difference between a MIDI file and a WAV file?
A MIDI file stores musical instructions — which notes to play, at what time, and at what velocity. It contains no audio data. A WAV file is real audio — actual recorded or synthesized sound that any media player can play back.
Why would I convert MIDI to WAV?
MIDI files require a synthesizer to play back. Most modern apps, phones, and streaming platforms do not have built-in MIDI playback. Converting to WAV makes your music playable on any device or platform without special software.
What synthesizer does this tool use?
The tool uses the Web Audio API built into your browser. Notes are rendered through oscillator nodes at the correct frequencies based on the MIDI note numbers. Amplitude envelopes shape each note to avoid harsh clicks.
Will the WAV file sound exactly like my original MIDI setup?
The output uses a basic synthesizer, not a full soundfont. One-instrument synthesis works well for single-instrument MIDI compositions but may not replicate complex multi-instrument arrangements accurately.
What sample rate does the output WAV use?
The output is stereo WAV audio at 44.1 kHz, which is the standard CD-quality sample rate. It is compatible with all audio editors, DAWs, and media players.
Is my MIDI file sent to a server?
No. All synthesis and encoding happen in your browser using the Web Audio API. Your MIDI file never leaves your device.
How does the tool know the tempo and timing of the notes?
The MIDI file contains tempo meta-events expressed in microseconds per beat. The tool reads these alongside the time division value in the file header to calculate accurate note start and end times.
Can I convert MIDI files with multiple tracks?
Yes. The tool parses all track chunks in the MIDI file. Notes from all tracks are merged into a single audio render.
What is the output file size like?
WAV files are uncompressed, so they are larger than MP3. A one-minute WAV at 44.1 kHz stereo is approximately 10 MB. For smaller files, consider converting the WAV to MP3 afterwards using the MP3 to WAV Converter on this site.
Does this tool support MIDI files with drum channels?
Drum channel 10 uses percussion instruments which require specific samples for accurate playback. The browser synthesizer treats channel 10 notes as regular tones, so percussion may not sound as expected.
Is the tool compatible with both Type 0 and Type 1 MIDI files?
Yes. Type 0 (single-track) and Type 1 (multi-track) MIDI files are both supported. Type 2 MIDI files are less common and may produce inconsistent results.
Can I use the WAV output in a DAW or audio editor?
Yes. Standard WAV files import into all major DAWs including Audacity, GarageBand, Ableton Live, FL Studio, and Logic Pro without any conversion needed.

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The MIDI to WAV Converter — Convert MIDI Files to WAV Audio is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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