How to Convert Audio to MIDI Free Online (2025)

What You're Actually Trying to Do (And How to Do It in 3 Steps)

If you're searching "how do I convert audio to MIDI for free online," you probably want to take a real recording — maybe you hummed a melody into your phone, or you have an audio file of a guitar riff — and turn it into MIDI notes (a digital, editable format that tells software which notes to play, when, and how loud) so you can edit the melody, change the instrument, or drop it into a music project.

Good news: you can do this for free, right in your browser, in under a minute. Here's the fastest method using LA Studio's free Audio to MIDI converter:

1. Open the tool. Go to la-studio.cc/audio-to-midi — no account, no download required.
2. Upload your audio file. Drag and drop an MP3, WAV, or any common audio file onto the page. This can be a voice memo of you humming, a recorded instrument, or a song clip.
3. Download your MIDI file. The tool analyzes the audio, detects the notes, and gives you a .mid file you can open in any DAW (music production software) like GarageBand, FL Studio, Ableton, or even back into LA Studio's own piano roll editor.

That's really it. The rest of this guide explains how the technology works, when it works well vs. when it struggles, and how to get the cleanest results possible — especially for beginners.

What Is Audio to MIDI Conversion, Exactly?

Let's back up for a second. Audio is a recording of sound — a wave of air pressure captured as a digital file. MIDI (Musical Instrument Digital Interface) isn't sound at all; it's just data — a list of instructions like "play note C4 at 80% volume for 0.5 seconds."

Converting audio to MIDI means software listens to your recording, figures out what notes were played, and writes those notes down as MIDI data. Think of it like a musician listening to a song and transcribing the sheet music by ear — except software does it automatically in seconds.

This is incredibly useful when you:

• Hummed a melody idea and want to edit it in a piano roll (the grid-style MIDI editor inside a DAW)
• Recorded yourself playing a simple instrument and want to change the sound to a piano, violin, or synth
• Found a song sample and want to extract the melody to build chords around it
• Want to learn what notes a recording is playing — basically auto-transcription

The Free Browser Method: How LA Studio's Audio to MIDI Works

LA Studio uses Basic Pitch, an open-source machine learning model originally developed by Spotify's Audio Intelligence Lab. It runs entirely inside your browser using a technology called ONNX (a way to run AI models without a server), which means your audio file never gets uploaded to a cloud — processing happens on your own device.

Here's what that means in practical terms:

• Free, with no usage caps — you're not burning through cloud credits
• Private — your recordings stay on your computer
• Fast — a 30-second clip typically converts in 5–15 seconds depending on your hardware
• Polyphonic support — it can detect multiple notes playing at the same time (chords), not just single-note melodies

Polyphonic just means "multiple notes at once" — like when you strum a guitar chord and several strings ring together. Many cheaper audio-to-MIDI tools only handle single-note (monophonic) melodies. Basic Pitch handles both.

Once you upload your file, the converter gives you a downloadable .mid file. You can then drag that MIDI file directly into the LA Studio editor to edit notes, transpose the melody, or assign a completely different instrument sound.

Tips for Getting the Best Results

Audio-to-MIDI conversion isn't magic — it works best under specific conditions. Here's how to set yourself up for success:

1. Use Clean, Single-Instrument Recordings

The cleaner and more isolated your audio, the more accurate the MIDI will be. A recording of you humming with no background music will convert much more accurately than a full song with drums, bass, and vocals all at once. If you have a full song, consider using LA Studio's stem separation tool first to isolate the melody or instrument track, then convert that isolated audio to MIDI.

2. Hum or Sing Clearly

If you're converting a hummed melody, keep a steady tempo, avoid sliding between notes too much, and try to hit each note crisply. A confident, in-tune hum will produce cleaner MIDI notes than a mumbled or heavily vibrato-ed melody. You don't have to be a perfect singer — just clear and deliberate.

3. Avoid Heavy Reverb or Echo

Lots of reverb (the "echo in a room" effect) smears notes together, making it hard for the AI to tell where one note ends and the next begins. If your recording sounds echoey, try recording in a smaller, softer space (like a closet full of clothes) or clean it up with a noise removal tool before converting.

4. Trim Your File to Just the Part You Need

Don't run 5 minutes of audio through the converter if you only need a 10-second melody. Shorter clips process faster and give you a cleaner, easier-to-edit MIDI file with fewer stray notes.

5. Expect Some Cleanup

Even the best AI tools make mistakes. You'll often get a few extra ghost notes, notes that are slightly off-pitch, or notes that are split when they should be one long note. That's normal — think of the MIDI output as a first draft that you refine in a piano roll. It still saves you enormous time compared to entering notes manually.

Polyphonic Audio to MIDI: Can It Handle Chords?

One of the most common questions is whether these tools can handle chords — situations where multiple notes play at the same time, like a piano piece or a strummed guitar. The answer with Basic Pitch (used by LA Studio) is yes, with reasonable accuracy.

It works best on:

• Solo piano recordings with clear note attacks
• Acoustic guitar (fingerpicked melodies especially)
• Bass guitar lines
• Clean electric guitar riffs
• Humming or whistling (monophonic — single note at a time)

It struggles more with:

• Full band recordings (too many sounds at once)
• Heavily distorted guitars (the harmonics confuse the pitch detector)
• Synthesizer pads with slow attacks (the AI can't tell exactly when the note started)
• Drums or percussion (these aren't pitched notes at all)

For complex polyphonic material from full songs, your best bet is to isolate stems first. According to Spotify's research on Basic Pitch, the model achieves strong results on isolated instruments but accuracy drops with dense mixes — which is expected for any current AI transcription system.

Turning a Hum Into a Full Song Idea — A Beginner Workflow

Here's a practical, end-to-end workflow for taking a melody idea from your head to an editable music project, using only free browser tools:

1. Record your hum. Use your phone's voice memo app. Hum the melody slowly and clearly. Keep it under 30 seconds for now.
2. Transfer the file. AirDrop, email, or upload the file to your computer.
3. Convert to MIDI. Go to la-studio.cc/audio-to-midi, upload the voice memo, and download the .mid file.
4. Open it in the editor. Go to la-studio.cc/editor and drag the MIDI file into the project. The melody appears as colored blocks in the piano roll.
5. Fix up the notes. Zoom in on the piano roll. Delete any stray ghost notes, drag any wrong notes to the right pitch, and adjust note lengths as needed.
6. Choose an instrument. Assign the MIDI track to a piano, synth, or strings instrument. LA Studio includes several built-in options like Salamander Grand Piano and Surge XT synthesizer.
7. Build from there. Add chords below the melody, add a drum beat, and you've turned a hum into the beginning of a real song.

How Does This Compare to Desktop Software?

There are several desktop applications that also do audio-to-MIDI conversion. Here's an honest comparison:

• Melodyne (by Celemony) — Industry standard. Excellent polyphonic accuracy, but costs $99–$400+. Requires installation on Mac or Windows. Best-in-class quality for complex polyphonic material.
• Logic Pro (Mac only) — Has a built-in "Convert to MIDI" feature that works well but costs $199.99 and only runs on Mac.
• FL Studio — The ZGameEditor and pitch-to-MIDI features exist but are more manual. Paid software starting at $99.
• LA Studio (browser, free) — Uses Basic Pitch AI. No installation, no cost, works on Windows, Mac, Chromebook, and any modern browser. Quality is excellent for clean recordings; not quite at Melodyne's level for complex polyphonic material. Best choice for beginners who want to try the workflow before investing in paid software.

The bottom line: if you're just starting out or want to quickly capture a melody idea, the free browser method is the right starting point. If you're a professional working with complex multi-instrument recordings, Melodyne is the gold standard.

Frequently Asked Questions

Q. Can I convert a song I recorded on my phone to MIDI?

A. Yes — you can upload voice memos, M4A, MP3, or WAV files. For best results, make sure the recording contains just a single melody or instrument (no background music). If the recording has background noise, try running it through a noise removal tool first. The AI will detect the notes and output a MIDI file you can edit.

Q. Will it work for converting a full song with drums and bass?

A. It will try, but the results will be messy. Audio-to-MIDI works best on isolated, single-instrument recordings. For a full song, the recommended workflow is: (1) use a stem separation tool to pull out just the melody or instrument you want, then (2) run that isolated stem through the audio-to-MIDI converter. This two-step process gives dramatically cleaner results.

Q. Is the MIDI file I get compatible with GarageBand, FL Studio, and Ableton?

A. Yes. The output is a standard .mid file (SMF — Standard MIDI Format), which is compatible with virtually every DAW on the market, including GarageBand, FL Studio, Ableton Live, Logic Pro, Reaper, Cubase, and more. Simply drag the file into your DAW of choice.

Q. My MIDI has a lot of extra wrong notes. What do I do?

A. This is completely normal, especially with complex or noisy recordings. The AI gives you a first draft, not a perfect transcription. Open the MIDI file in a piano roll editor, zoom in, and delete any notes that don't belong. Most melodies only take a minute or two to clean up. Think of it as roughly 80% of the work done automatically — you just finish the last 20%.

Q. Do I need to create an account to use the free converter?

A. No account is required to use the Audio to MIDI converter at LA Studio. Just open the page, upload your file, and download the result. Some advanced features in the broader LA Studio editor require an account, but the core conversion tool is completely free and open to anyone.