Convert MP3 to MIDI
Upload an MP3 and get a .mid file with the notes the converter hears. A solo instrument or an a cappella vocal gives a clean result; a full song gives a sketch of its loudest line that you tidy up afterwards.
Audio Converter
or drop MP3, WAV, M4A … files here ·
Max 95 MB per file· Up to 20 files· Deleted after 30 minutes
Files are processed on our servers and deleted after 30 minutes.
Constant bitrate (CBR) gives a predictable size and works on every player. Variable bitrate (VBR) spends bits where the music needs them and is usually smaller at the same quality.
Keep the source rate unless a device asks for one. 44.1 kHz is CD standard, 48 kHz is video standard, 8 kHz is used by phone systems and AMR.
Mono halves the size of lossless files and is fine for voice recordings.
16-bit is CD quality. 24-bit keeps headroom for editing and mastering; converting a 16-bit source up does not add detail.
Optional. Seconds (e.g. 75) or minutes:seconds (1:15). Leave empty to start at the beginning.
Optional. Same format as the start time. Leave empty to keep everything up to the end.
How to use this tool
- 1
Choose the MP3
Add up to 20 MP3 files at 95 MB each. A short clip of one section is easier to check than a whole album track.
- 2
Trim to the part you want
Under Trim & volume, set Start at and End at to the chorus or solo you are after, for example 0:45 to 1:20.
- 3
Convert to MIDI
Press Convert to MIDI (transcribed notes) and open the .mid file in your DAW, in MuseScore or in a piano-learning app.
Converting MP3 to MIDI means transcribing it: the tool estimates the pitch and start of each note and writes them as MIDI events. None of the original sound comes along, and the more exposed the melody is in the recording, the closer the file gets to what was actually played.
Can you really convert an MP3 to MIDI?
Partly. An MP3 stores a mixed, compressed waveform, and the encoder has already discarded detail it judged inaudible, mostly in the highest frequencies. Pitch detection does not need that detail, so a 128 kbps file transcribes about as well as the WAV it came from. The real obstacle is the mix: when vocals, guitars, keys and bass play at once, their harmonics overlap and the software has to guess which line you mean.
That is why the best sources are already sparse: a solo piano piece, a flute or violin line, an a cappella vocal, a whistled tune, or a single stem exported from a multitrack session. A commercial pop song comes back as a busy file in which the vocal melody is present but surrounded by notes borrowed from the accompaniment. That is still useful, because deleting wrong notes is quicker than finding every right one by ear.
What survives the trip from MP3 to MIDI
| Property | In the MP3 | In the MIDI file |
|---|---|---|
| Pitch | Implied by the waveform | Note numbers 0–127, rounded to semitones |
| Timing | Continuous audio | Note-on and note-off events |
| Dynamics | Waveform amplitude | Velocity 1–127 per note |
| Instrument sound | Fully recorded | Not stored; chosen by the player |
| Lyrics | Sung on the recording | Not transcribed |
| Effects and mix | Baked in | Gone |
| Size per minute | About 1 MB at 128 kbps, 2.4 MB at 320 kbps | Usually a few kilobytes |
Which MP3s convert to MIDI well
Transcribes well
- Solo piano or guitar played one note at a time
- A cappella vocals, humming and whistling
- Woodwind, brass and string solos
- Isolated bass lines and synth leads
Transcribes poorly
- Dense pop and rock mixes
- Drum kits and percussion, which have no steady pitch
- Strummed or heavily distorted guitar chords
- Live recordings full of crowd noise and reverb
A practical workflow for a full song: separate it into stems with a stem-splitting tool, convert only the vocal or lead stem, then place the MIDI under the original MP3 in your DAW and fix wrong notes by ear. If the music is your own recording, WAV to MIDI has tips for capturing a take that transcribes cleanly. If it lives inside a video, pull the soundtrack out first, as described in how to convert MP4 to MP3.
MP3 versus MIDI: two very different files
MP3
MP3 audio
MP3 (MPEG-1 Audio Layer III) is a lossy audio format developed largely at the Fraunhofer Institute and standardised by MPEG in 1993. It removes sounds the ear is unlikely to notice, shrinking music to about a tenth of CD size at 128–320 kbps. All patents have expired, and every phone, car stereo, browser and media player supports it. Quality loss is audible at low bitrates and accumulates with re-encoding.
- Compression
- Lossy
- Transparency
- –
- Animation
- –
- Introduced
- 1993 · Fraunhofer IIS / MPEG
MIDI
MIDI file
A MIDI file (.mid or .midi) stores musical instructions rather than recorded sound, following the Standard MIDI File format published in 1988. It lists notes, timing, velocity, instruments and controller changes, so files are tiny and fully editable. How it sounds depends entirely on the synthesizer or instrument plugin that plays it. MIDI is used in DAWs, notation software, keyboards and karaoke, but it cannot store vocals or real recordings.
- Compression
- –
- Transparency
- –
- Animation
- –
- Introduced
- 1988 · MIDI Manufacturers Association
MP3 is how most songs reach people, so it is the file musicians have when they want to learn a part, build a backing track or write out a lead sheet; transcribing it to MIDI gives them notes to correct instead of starting from nothing by ear.
Convert MP3 to MIDI: what people ask
Can I get the chords as well as the melody from an MP3?
Sometimes, on clean piano or guitar recordings where chords are played slowly and evenly. In a dense mix the chord tones compete with the vocal and bass, and the result is unreliable. For a chord chart, transcribe the melody here and work out the harmony against the original recording.
Why are there notes in the MIDI that nobody played?
Instruments produce overtones above the note being played, and reverb, cymbals and backing vocals add energy at other pitches. When one of these is strong enough it is written as a short extra note. Most DAWs can select notes by length or velocity, which makes them quick to remove.
Will the MIDI play back with the instruments from the song?
No. The file only says which notes to play; your DAW, phone app or synth decides the sound, and most players default to a General MIDI piano. Assign a different instrument to the track, or render it with MIDI to MP3 to hear it as audio.
Does the MP3's bitrate affect the transcription?
Very little above 128 kbps. MP3 encoders discard high-frequency detail first, while pitch detection relies on the fundamental and the lower harmonics, which survive. Very low bitrates with swirling artifacts can add false notes, so start from the best copy you have.
How do I turn the MIDI into sheet music?
Open the .mid file in a notation program such as MuseScore and choose the shortest note value it should recognize, for example sixteenth notes. Quantizing to a coarser grid hides the tiny timing differences of a real performance, which would otherwise show up as ties and stray rests.
