MIDIFLOW review
A free, private browser tool for converting melodic and polyphonic audio into MIDI.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
MIDIFLOW is a free, browser-based audio-to-MIDI converter for musicians, producers and music learners. It accepts MP3, WAV, M4A, FLAC and OGG files, estimates notes locally on the user’s device, and exports editable MIDI. Its polyphonic transcription supports chords and overlapping notes, while melodic material is also covered. The workflow requires no account, and selected audio is not uploaded to the service, making it a practical option for users who want to keep processing on their own device.
Pricing is straightforward: the Free plan costs 0 and includes browser-based audio processing, no signup, no watermark and MIDI download. The published plan structure keeps the tool accessible for occasional conversion and does not add a paid tier that users need to evaluate. The main practical constraint is device capacity. Although the site states that it does not impose a server-side length limit, very large files may exceed available memory on the user’s device. That makes file size and local hardware more relevant than a subscription limit.
The standout feature is the amount of musical information retained in the export. MIDI files can include note timing, pitch, velocity and eligible pitch-bend data, and users can adjust the note sensitivity threshold before comparing the original audio with a synthesized MIDI preview. That comparison can help identify whether the transcription reflects the source closely enough for editing. MIDIFLOW is a good fit for free, browser-based conversion across common audio formats, especially when local processing matters. Users who need notation output, verified integrations or a broader desktop and platform ecosystem should choose another tool.
MIDIFLOW pros and cons
- Where it wins
- Converts MP3, WAV, M4A, FLAC and OGG files
- Handles polyphonic material with timing, pitch and velocity data
- Runs locally with no signup or watermark
- Where it doesn't
- Web-only workflow limits platform flexibility
- No notation output or verified integrations
- Very large files may exceed device memory
MIDIFLOW fact sheet, pricing and score →
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