Tutorials5 min read
Free Audio to MIDI Converter (No Upload)
Convert MP3, WAV, OGG, or FLAC to MIDI free, with no sign-up. Runs entirely in your browser and transcribes chords, not just single notes.
Audio to MIDI converter
Convert MP3, WAV, OGG, FLAC, or M4A to MIDI with on-device AI transcription — free, instant, and private. Nothing leaves your device.
Drop an audio file here, or click to browse
Transcribes to MIDI — supports MP3, WAV, OGG, FLAC, and M4A
Everything you need to convert audio to MIDI online
Real AI transcription, not pitch detection alone
Uses Spotify's basic-pitch model to detect polyphonic notes (chords, not just a single melody line), pitch bends, and note onsets/durations — not a simple monophonic pitch tracker.
100% private — no upload
Transcription runs entirely in your browser using an on-device machine learning model. Your audio is never sent to a server, stored, or heard by anyone but you.
No account, no watermark, no per-song limit
Free to use with no sign-up. Unlike paid transcription apps that cap free use at the first 30 seconds of a song, this transcribes the full file.
Works with common audio formats
Accepts MP3, WAV, OGG, FLAC, and M4A — no need to convert your file first.
Works on any device
Fully responsive with touch-friendly controls — transcribe audio from your phone, tablet, or desktop without installing anything.
Safe for unreleased or personal recordings
Because nothing leaves your device, this is safe to use on demos, unreleased tracks, or personal recordings you can't upload to a third-party server.
Three steps to a MIDI file from your audio
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Upload your audio
Drag and drop an MP3, WAV, OGG, FLAC, or M4A file onto the page, or click to browse. Nothing is uploaded to a server — the file stays on your device.
- 2
AI transcribes the notes automatically
An on-device machine learning model listens to the audio and detects pitch, timing, and note duration entirely in your browser. A progress bar shows the transcription as it runs.
- 3
Download your MIDI file
Once transcription finishes, click Download to save the .mid file — open it in any DAW or notation software.
Built for musicians, producers, and anyone transcribing by ear
Whether you're turning a rehearsal recording into an editable MIDI track, rescoring a melody for a different instrument, or getting a first-pass transcription to clean up in notation software — PixelTools transcribes the notes in seconds with no upload required.
Musicians and producers
Turn a hummed melody, a phone recording of a rehearsal, or a rough demo into an editable MIDI file you can drop straight into your DAW.
Rearranging and remixing
Extract the notes from an existing song to rescore it for a different instrument, transpose it, or build a remix around the original melody.
Music students and transcribers
Get a first-pass MIDI transcription of a piece you're learning by ear, then clean it up in notation software instead of transcribing every note from scratch.
Sheet music prep
A MIDI file is the standard input for notation software like MuseScore — transcribe audio here, then import the MIDI to generate a first-draft score.
Frequently asked questions
Is the audio to MIDI converter free?
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Yes, completely free with no limit on the number of conversions (files up to 20 minutes long are supported — see below). No subscription, no account, no watermark — unlike paid tools that cap free transcription at 30 seconds.
Does this tool upload my audio to a server?
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No. Transcription runs entirely in your browser using an on-device machine learning model. Your audio file never leaves your device.
How accurate is the transcription?
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It uses Spotify's basic-pitch model, an instrument-agnostic AI trained for polyphonic note transcription — it handles chords and multiple simultaneous notes, not just a single melody line. Accuracy is strongest on music with clear pitched instruments or vocals; heavily distorted, percussion-only, or very noisy audio transcribes less cleanly.
What audio formats are supported?
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MP3, WAV, OGG, FLAC, and M4A are all supported. The output is always a standard .mid file.
Is there a file size or length limit?
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Files up to 100MB and about 20 minutes long are supported. Longer files take proportionally longer to transcribe since everything runs on your device rather than a server.
Can I play the MIDI file back on this page?
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Not yet — download the .mid file and open it in a DAW (Ableton, Logic, GarageBand, FL Studio) or notation software (MuseScore) to play it back, edit the notes, or change the instrument.
Why does the first conversion take longer than the next one?
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The first time you use the tool in a session, your browser downloads the transcription model (under 1MB, a one-time download that's then cached). Subsequent transcriptions in the same session start immediately.
What if no notes are detected?
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If the audio is silent, extremely noisy, or has no clear pitched content, the tool shows an error instead of producing an empty MIDI file. Try a recording with clearer melodic or harmonic content.
Convert your audio to MIDI now
Free, instant, no account needed.