High-bitrate exports
A well-encoded 256 or 320 kbps file generally retains more transient and high-frequency information than a 128 kbps version of the same mix.
MP3 to MIDI Converter
Convert an MP3 recording to MIDI online for free. Hear the detected notes before downloading, then edit them in your music software. No account or audio upload.
Start with a short solo melody, vocal or instrument stem. A full mix may produce overlapping or extra notes.
6.5-second synthetic melody · a workflow demo, not an accuracy benchmark.
This file may need a lot of memory
The selected file is {size}. MIDIFLOW does not upload it or impose a server limit, but very large files can run out of memory, especially on a phone.
0notes
—range
0.0sduration
0max polyphony
0.25
Compare the original with a simple synth preview of the detected notes. The preview does not reproduce the original sound or pitch bends.
Too many or missing notes? — increase it to keep fewer, more confident notes; decrease it to include quieter notes. Then compare the previews again.
Free foreverNo signupNo watermarkAudio never uploaded
Best input
When MP3 is a practical MIDI source
MP3 is convenient and widely supported. Clear melodic recordings can transcribe well even though the file has already passed through lossy compression.
Solo parts
A compressed solo vocal, piano or lead instrument is often easier to interpret than an uncompressed but crowded master. Arrangement matters as much as format.
Existing downloads
If MP3 is the only source you own, use it directly. MIDIFLOW decodes it locally and does not create a second lossy upload copy.
What can go wrong
How MP3 compression can confuse note detection
MP3 is lossy: its encoder removes or simplifies audio information judged less audible. Pitch transcription depends on both the fundamental and its harmonic pattern, so discarded high-frequency detail can make the note evidence less distinct.
At 128 kbps and below, cymbals, attacks and upper harmonics are more likely to smear or disappear than in a 320 kbps version from the same source. The exact damage varies with the encoder and music; bitrate alone cannot predict a note count.
Repeated transcoding adds another problem. An MP3 made from another MP3 has been perceptually encoded twice, and new artifacts can be mistaken for short notes or obscure a real onset.
How to convert MP3 to MIDI online
- 01
Choose a clear MP3
Select the MP3 file above. For a first check, use 10–30 seconds of one instrument or a solo vocal. No MP3-to-WAV conversion is needed.
- 02
Compare the notes
Play the original, then Play MIDI notes. If there are too many notes, increase Note threshold and choose Apply threshold. Lower it if quiet notes are missing.
- 03
Download and use the MIDI
Save the .mid file and import it into a software instrument track. Choose a sound, then correct any remaining pitch, timing or note-length errors.
Transcription is powered by Spotify's open-source Basic Pitch model and runs in your browser.
Improve accuracy
Get a more accurate MP3-to-MIDI result
Start with the least compressed generation of the recording. Changing the file extension or container does not restore information removed by an MP3 encoder.
Use the original WAV when it exists
If the recording came from a DAW, recorder or sample pack, locate that lossless source and use the WAV-to-MIDI workflow instead.
Do not convert MP3 to WAV first
That creates a larger PCM file containing the same decoded MP3 signal. Lost harmonics and transient detail do not come back.
Avoid low-bitrate preview copies
Choose a 256 or 320 kbps export over a 128 kbps preview when both are available, then isolate the part you actually need.
After converting: check that the MIDI is useful
The preview sounds different from the MP3
That is expected: MIDI describes note events, not a recording. Play MIDI notes uses a simple synth so you can compare the melody and rhythm. It does not reproduce your singer, guitar tone, production effects or pitch bends.
The MIDI has extra notes or the wrong octave
Compare a short phrase with the original. Increase Note threshold in small steps and apply it, then listen again. The setting can also remove real quiet notes. If the same errors remain, use a cleaner isolated part; correct individual notes after importing into your music software.
The downloaded MIDI is silent in my music software
Load a software instrument on the track containing the imported notes and check that the track is not muted. A MIDI file does not contain an audio waveform. A general media player may not have an instrument available to play it.
I want separate piano, bass and drum tracks
This converter produces one note track from the supplied audio. It does not separate instruments, identify drum parts or reconstruct a full project. Export an isolated instrument stem from your source first, convert it, then name and arrange the track in your music software.
Import the MIDI into your DAW
The download is a standard MIDI file containing note timing, pitch, velocity and eligible pitch-bend events. It does not contain the original instrument sound, so assign any software instrument after importing it.
Ableton Live
Create or choose a MIDI track, then drag the .mid file into an empty clip slot or the Arrangement. Load an instrument on that track and edit notes in the MIDI Note Editor.
Logic Pro
Drag the file into the Tracks area and choose a Software Instrument track. Open the Piano Roll to correct timing, note lengths or velocity before arranging.
FL Studio
Drag the file into the Channel Rack or use File › Import › MIDI file. Send the imported notes to a chosen instrument, then clean them in the Piano roll.
FAQ
Can I convert MP3 to MIDI online for free without signing up?
Yes. MIDIFLOW processes the selected file in your browser and lets you download the resulting MIDI without an account, watermark or per-song quota. Available memory and the complexity of your recording can limit what your device can process.
Can I listen to the MIDI before downloading it?
Yes. Choose Play MIDI notes after conversion to hear a simple synth preview of the detected pitches and timing. Compare it with Play original. The preview does not reproduce the source sound or pitch bends.
Can a 128 kbps MP3 be converted to MIDI?
Yes, but low-bitrate compression may blur attacks and harmonic detail. A simple melody can still work; a dense or bright arrangement is more likely to produce errors.
Is 320 kbps always accurate enough for transcription?
No bitrate guarantees accuracy. A 320 kbps file usually preserves more detail than a 128 kbps copy, but overlapping instruments, distortion and reverb can still dominate the result.
Will converting my MP3 to WAV improve the MIDI?
No. Decoding MP3 into a WAV changes how the samples are stored, not the information available. Compression losses remain in the waveform.
Does MIDIFLOW recompress my MP3 before analysis?
No. The browser decodes your selected file and makes the mono 22.05 kHz analysis buffer required by Basic Pitch; it does not encode another MP3.
Why does an MP3 create short notes around cymbals?
Percussive energy and compression artifacts can create brief spectral peaks. The model may interpret some of them as note onsets, especially at a low sensitivity threshold.
Should I use constant or variable bitrate MP3?
Either can work. Source quality and sufficient bitrate matter more than the CBR/VBR label; use the highest-quality encode closest to the original session.