How accurate is MP3 to MIDI conversion?

Accuracy depends mostly on what is in the recording. A clean piano performance, isolated guitar line, bass phrase, or simple melody gives the transcription model clearer pitch information than a dense mastered song with drums, vocals, reverb, and several instruments playing at once. The converter also cleans the raw transcription by removing tiny fragments, merging same-pitch overlaps, correcting timing latency, and optionally restoring repeated attacks. Even with that cleanup, automatic audio-to-MIDI transcription is not a perfect score: complex passages can still contain missed notes or extra harmonics. The output is designed to be a strong editable starting point in a DAW.

Do you upload my audio?

No audio upload is required for the conversion workflow on this page. Your browser decodes the selected file and runs the transcription on your device. The Basic Pitch model files are downloaded when they are needed, but your song or recording is not sent to our application server for note detection. That local-first design is useful for unfinished music, client work, rehearsal recordings, private demos, and other material you may not want to hand to an online conversion service. The generated MIDI is also created in the browser and becomes a local download. As with any website, ordinary page requests still reach the web server, but the selected audio file itself stays on your device.

Which audio formats are supported?

The current converter accepts MP3, WAV, M4A, AAC, OGG, FLAC, and WebM files, with a browser limit of five minutes and 100 MB per file. Actual decoding support can still vary slightly by browser because the browser is responsible for turning the file into raw audio before transcription starts. MP3 and WAV are the safest choices when you want maximum compatibility across desktop browsers. If a less common file does not decode, converting it to WAV or MP3 first is usually the simplest workaround. The output is a standard .mid MIDI file that can be imported into most DAWs, notation programs, and MIDI utilities.

Can I edit the MIDI after converting?

Yes. Editing is the main reason to convert recorded audio into MIDI. The downloaded .mid file contains note pitches, note starts, durations, velocities, tempo information, and track data rather than a copy of the original waveform. You can open it in software such as Ableton Live, FL Studio, Logic Pro, Cubase, Reaper, GarageBand, or a notation editor, then change instruments, move notes, fix wrong pitches, adjust velocity, quantize timing, or rearrange a phrase. Automatic transcription may not separate melody and accompaniment into the exact tracks you would create by hand, so some cleanup in the piano roll is normal, especially for polyphonic or full-mix audio.

Is the MP3 to MIDI converter free?

Yes. The current first release is free for standard single-file conversion and does not require an account, subscription, project, or credit balance. The browser version is intentionally limited to files up to five minutes and 100 MB so that conversion stays practical on normal laptops and phones. There is no hidden payment step before downloading the generated MIDI. In the future, heavier features such as long files, batch conversion, stem processing, or an API may make sense as paid options, but those are not part of the current free converter. The page is built around letting you test the actual conversion result before any future commercial features exist.

Is this an online MP3 to MIDI converter if the file stays local?

Yes, in the useful sense that the tool runs from a website and does not require you to install desktop software, but the audio processing itself is local. Traditional online converters often upload a file to a remote server, wait for server-side processing, and return a download. This converter instead loads the transcription code and model into your browser, then analyzes the audio on your device. That approach combines the convenience of an online MP3 to MIDI converter with a stronger privacy boundary for the selected recording. You still need an internet connection to load the site and model files, but the audio does not need to be transferred to us for transcription.

Is MP3 to MIDI conversion using AI?

The note transcription step uses Spotify's Basic Pitch model, a machine-learning system designed to estimate musical notes from audio. Calling the whole converter “AI” can be misleading, though, because several important parts are ordinary deterministic signal and MIDI processing. After transcription, the app removes very short notes, merges overlaps, compensates for model timing latency, estimates tempo, and can quantize timing or detect repeated attacks. The model is useful because audio does not contain explicit MIDI note events; those events have to be inferred from the sound. The resulting MIDI should still be reviewed like any automatically generated transcription, especially when the source contains several instruments or heavy effects.

Free · No account · Runs in your browser

MP3 to MIDI Converter

Turn songs, melodies, and instrument recordings into editable MIDI. Your audio stays on your device and is processed locally in the browser.

Audio to MIDI

Local processing

Files never leave your device. Browser-based processing keeps private recordings private.

3-step workflow

How to convert MP3 to MIDI

The converter keeps the workflow deliberately simple: choose an audio file, let the browser transcribe the notes, then download an editable MIDI file. Nothing is uploaded to our server during transcription.

1
Choose your audio
Drop an MP3, WAV, M4A, AAC, OGG, FLAC, or WebM file into the converter. Short, clean recordings with a clear instrument usually produce the easiest MIDI to edit. The current browser version supports files up to five minutes and 100 MB.
2
Transcribe and clean the notes
Basic Pitch analyzes the audio locally and estimates note pitches and timing. Our post-processing removes very short fragments, merges same-pitch overlaps, corrects model latency, and can restore repeated piano attacks. You can preserve the performance timing or quantize the result to a grid.
3
Download and edit the MIDI
Download the generated .mid file and open it in Ableton Live, FL Studio, Logic Pro, Cubase, Reaper, GarageBand, or another MIDI-capable DAW. MIDI stores notes and timing rather than the original sound, so you can change tempo, instruments, note lengths, velocity, and arrangement.

Quick audio example

This tiny synthesized four-note example is included only to demonstrate the kind of clean melodic input that is easiest to transcribe. Real recordings can contain chords, room noise, drums, vocals, and overlapping instruments, so results naturally vary.

Input and output at a glance

Audio input: MP3, WAV, M4A, AAC, OGG, FLAC, WebM
Output: Standard MIDI (.mid)
Browser limit: Up to 5 minutes / 100 MB

Built for musicians

A converter that behaves like a tool, not a file-upload funnel.

The first version is designed around private browser processing, editable results, and a fast path from audio file to MIDI — without sign-up screens or server uploads.

Private by default

Audio is processed on your device instead of being sent to a remote conversion server.

Browser processing

The transcription model is loaded only when you need it, keeping the first page load lightweight.

Editable MIDI output

Use the generated MIDI in Ableton Live, FL Studio, Logic, Cubase, Reaper, and other DAWs.

Simple export

No account wall. Convert a file, review the result, and download the MIDI.

What to expect from audio-to-MIDI conversion

Audio and MIDI describe music in very different ways. An MP3 is a recording of sound pressure over time, while MIDI is a sequence of note events, velocities, channels, and timing instructions. Converting between them is therefore a transcription problem rather than a simple file-format change. The model has to infer which notes were played, when they started, and how long they lasted.

Clean melodies are easier than dense mixes

A solo piano line, guitar melody, bass phrase, humming voice, or isolated instrument generally gives the transcription model clearer evidence than a mastered song containing vocals, drums, bass, pads, reverb, and several instruments at once. Polyphonic piano can work well because the pitches are stable, but complex mixes may create extra notes from harmonics or miss quiet notes hidden under louder sounds. For the cleanest editable result, start with the least crowded source you have. If you own stems, an isolated instrument stem is usually a better input than the full mix.

The MIDI is meant to be edited

The generated file should be treated as a useful starting point, not a perfect score of the recording. The converter automatically removes tiny note fragments and same-pitch overlaps, and it offers optional quantization to make piano-roll editing easier. Even after cleanup, you may want to delete an incorrect note, split or join a note, adjust velocity, change the tempo grid, or separate melody and accompaniment into different tracks. That is normal for automatic transcription and is exactly why MIDI output is useful: every detected note remains editable.

Preserve timing or straighten it to a grid

Human performances rarely stay at one mathematically exact tempo. A pianist may slow down at the end of a phrase or push slightly ahead of the beat. Preserve Performance keeps those timing differences, while Quantize can snap note starts to 1/8, 1/16, or 1/32 divisions. Quantizing note endings is optional because it changes note lengths as well as starts. For expressive recordings, preserving timing is often safer. For loops, electronic music, or material you plan to edit heavily in a DAW, quantization can make the result much easier to work with.

Local processing is the privacy boundary

Your selected audio is decoded and analyzed in the browser on your own device. The transcription model is downloaded when needed, but the recording itself is not sent to our application server for conversion. This matters for unfinished songs, client recordings, rehearsal takes, demos, and other audio you may not want to upload to a third-party conversion service. Browser performance still depends on your device, available memory, and browser support, which is why the first release uses a five-minute limit rather than pretending every phone or laptop can process arbitrarily large recordings.

FAQ

MP3 to MIDI questions

Need the conversion in the other direction?

Render a MIDI file to MP3 locally in your browser, with bitrate and output-level controls and no account required.

Open MIDI to MP3