How to Convert Instrument Audio to MIDI for Free — Right in Your Browser

Can You Really Convert Instrument Audio to MIDI? Here's the Short Answer

"I want to turn my piano performance into MIDI data." "I'd love to get that guitar riff I just played into my DAW." — Sound familiar? If you've ever given up on this idea because it seemed to require installing complicated software or wrestling with technical settings, you're not alone.

The good news: as of 2024, you can convert instrument audio to MIDI for free, entirely in your browser. Tools built on Basic Pitch — an open-source AI model developed at Spotify — run directly in the browser with no installation or sign-up required. In this guide, we'll walk you through how the technology works, step-by-step instructions, tips for better results, and answers to common questions — all written with beginners in mind.

What Is Audio-to-MIDI Conversion? A Quick Overview

Audio-to-MIDI conversion is the process of analyzing the pitch and timing in a recorded audio file (WAV, MP3, etc.) and translating that information into MIDI note data.

Audio vs. MIDI: What's the Difference?

• Audio (WAV/MP3): A recording of actual sound waves. You can edit the waveform directly, but changing pitches or swapping instruments is difficult.
• MIDI: Performance data — which notes were played, when, and how hard. You can freely change sounds, adjust tempo without any audio degradation, and edit individual notes.

In short, Audio-to-MIDI is your go-to solution when you want to play back a piano performance through a software synth in your DAW, or check a guitar phrase on a MIDI keyboard.

Which Instruments Work Best?

Current AI conversion models like Basic Pitch perform best with single-note lines and simple chords. Here's a quick breakdown:

• ✅ Single-note melodies (flute, saxophone, violin, vocal humming, etc.): High accuracy
• ✅ Piano (including chords): Polyphonic support with good results — some noise possible on dense chords
• ✅ Acoustic/electric guitar (single-note lines): Works well for solo lines and lead playing
• ⚠️ Guitar chords (strummed): All six strings at once significantly reduces accuracy; arpeggiated playing converts much more cleanly
• ⚠️ Drums and percussion: Not suited for unpitched instruments. For drums, it's better to use stem separation first, then a dedicated drum transcription tool.

Free, Browser-Based Audio-to-MIDI Conversion: Step-by-Step Guide

The following walkthrough uses the LA Studio Audio-to-MIDI tool as an example. It runs in your browser (Chrome recommended) with no installation or login required.

Step 1: Prepare Your Audio File

Start by getting a recording of the performance you want to convert.

1. Record your performance using your phone's voice memo app or your DAW
2. Supported formats include WAV, MP3, OGG, and other common audio formats
3. Recording tip: Record in the quietest environment possible to minimize background noise — this directly affects conversion accuracy

If your recording has noticeable background noise, running it through a noise removal tool before conversion can noticeably improve your results.

Step 2: Open the Audio-to-MIDI Tool

1. Navigate to https://la-studio.cc/audio-to-midi in your browser
2. Drag and drop your audio file onto the upload area, or click to browse for it
3. Once the upload is complete, analysis will begin automatically

Step 3: Preview and Download Your MIDI

1. When analysis is complete, the converted MIDI notes will appear on a piano roll
2. Hit play to preview the conversion and make sure it sounds right
3. Click "Download MIDI" to save the Standard MIDI File (.mid) to your computer
4. Drag the downloaded file directly into any DAW — Cubase, Studio One, GarageBand, FL Studio, and others all support it

Step 4: Put Your MIDI to Work in Your DAW

Once the MIDI is in your DAW, you've got a lot of options:

• Swap instruments: Turn a piano line into strings, a synth lead, or anything else
• Fine-tune pitches: Open the piano roll and correct any notes that didn't convert perfectly
• Use it as an arrangement starting point: Turn a melody you played into a bass line or counter-melody
• Export as sheet music: Import the MIDI into notation software like MuseScore to generate a printable score

5 Tips to Get Better Conversion Results

Because the AI analyzes your audio directly, recording quality has a big impact on accuracy. These simple habits can make a significant difference.

1. Record Short Phrases, Not Long Takes

Instead of converting a five-minute performance in one go, break it into 10–30 second segments. Shorter, isolated phrases give the AI much less to get confused about — and single-instrument recordings will always outperform mixed recordings.

2. Clean Up Noise Before Converting

Background noise — HVAC hum, room reverb, ambient sound — makes it easy for the AI to "hear" notes that aren't there. Either record in a quiet space or run a noise removal pass before conversion.

3. Play Guitar Parts as Single Notes or Arpeggios

Strummed chords stack six strings of complex overtones on top of each other, which often results in a messy MIDI output. If you're recording guitar, split your chord voicings into single notes or arpeggios for much cleaner results.

4. Watch Your Recording Levels

Clipping (distortion from recording too loud) throws off pitch detection. Aim for peaks around -6 dBFS when recording — loud enough to be clear, with enough headroom to avoid distortion.

5. Use Stem Separation First

If you're working with a full band recording or a backing track with multiple instruments, run it through a stem separation tool first to isolate each instrument. Converting individual stems rather than a full mix dramatically improves accuracy.

Audio-to-MIDI Tool Comparison

Here's a look at the most popular options, browser-based and desktop alike:

• LA Studio Audio to MIDI (Browser): Free, no sign-up, no installation. Runs Basic Pitch (ONNX) entirely in the browser. MIDI can be loaded directly into the built-in editor. la-studio.cc/audio-to-midi
• Basic Pitch Web (Spotify) (Browser): Free, no sign-up. The original Basic Pitch implementation. Simple UI, great for beginners, supports MIDI download.
• Melodyne (Celemony) (Desktop): Industry-leading accuracy. Paid (Essential edition starts around $99). Requires installation. The standard choice in professional studios.
• Logic Pro (Mac only): Includes "Flex Pitch" for monophonic conversion. Paid ($199.99 one-time). Mac exclusive.
• GarageBand (Mac/iOS): Free. Monophonic only. Includes "Smart Instrument" features for real-time guitar and vocal MIDI conversion.

Bottom line: For free, browser-based conversion, LA Studio or Basic Pitch Web are the way to go. For professional-grade accuracy, Melodyne is the gold standard.

Frequently Asked Questions

Q: Can I convert strummed guitar chords to MIDI?

A: Technically yes, but accuracy drops significantly compared to single-note playing. Strummed chords produce a dense mix of overtones across all six strings, making it easy for the AI to misidentify individual pitches. The most practical approach is to either re-record the chord progression as an arpeggio or single notes, or manually clean up the converted MIDI afterward in your DAW's piano roll. Melodyne Studio (the top-tier edition) supports polyphonic conversion and handles chords considerably better than most alternatives.

Q: Can I convert audio recorded on my phone?

A: Yes. Files from iPhone Voice Memos (M4A) and Android recording apps (AAC/MP3) are all supported. That said, built-in phone microphones tend to pick up more ambient noise, so try to record close to the instrument in a quiet room for best results.

Q: Will the converted MIDI have pitch errors?

A: It can. Pitch detection is most likely to go wrong in these situations: (1) the instrument is tuned significantly away from A=440Hz, (2) the instrument has a complex overtone series (like an open guitar chord), or (3) the recording has heavy reverb or background noise. After conversion, always review the MIDI in your DAW's piano roll and correct any notes that are off — this cleanup step is a normal part of the workflow.

Q: Can I convert vocal melodies or humming?

A: Absolutely. Single-note vocals and humming have a clear, consistent pitch, which makes them well-suited for tools like Basic Pitch. Once converted, you can assign the MIDI to a synth, string ensemble, or any other virtual instrument. LA Studio also offers a dedicated Voice to MIDI feature that converts hummed melodies directly to a MIDI track.

Q: Which DAWs can open the converted MIDI file?

A: The file is exported as a Standard MIDI File (SMF, .mid), which is universally compatible. You can import it into Cubase, Studio One, FL Studio, Ableton Live, Logic Pro, GarageBand, Reaper, Cakewalk — essentially any DAW that supports MIDI import, which is all of them. Just drag and drop the file, or use the File menu to import.

Wrap-Up: Try It in Your Browser Right Now

Converting instrument audio to MIDI used to mean buying expensive software and spending hours on setup. Today, thanks to advances in AI, you can do it for free, in your browser, in a matter of seconds — no installation required.

Start by recording a short phrase (10–30 seconds) and dropping it into the LA Studio Audio-to-MIDI tool. You can preview the result, edit it right in LA Studio's built-in piano roll, and refine your arrangement from there. When you need professional-grade accuracy down the road, Melodyne is always worth exploring — but for now, there's no better way to discover what MIDI conversion can do than trying it for free.