MP3 to MIDI Converter
Upload an audio file and get a MIDI file back. Drop in your MP3, WAV, M4A, FLAC, AAC, AIFF, or MP4 audio and our AI converter writes a standard MIDI file you can open in any DAW.
Upload your audio file
Click to upload or drag and drop your audio file!
Supported audio formats: MP3, MP4, WAV, M4A, FLAC, AAC, AIFF
Note: Your audio is never saved or stored, everything remains on your device
MP3 to MIDI, WAV to MIDI, and many more audio formats!
This app converts any audio to MIDI using Artificial Inteligence (AI). For the opposite conversion refer to MIDI to MP3 converter.
* The technologies used are TensorFlow.js for GPU-accelerated inference and Magenta's musical note-based model, a neural network trained for polyphonic audio transcription and advanced pitch detection.
Looking for something different?
This tool converts a local audio file into MIDI. If you already have a MIDI file, or you want sheet music instead, the dedicated tools below cover those flows.
Key Features
What makes this audio file to MIDI converter useful for musicians
AI-Powered Transcription
Uses Google's Magenta Onsets and Frames deep learning model, trained on thousands of hours of piano music for accurate note detection.
100% Browser-Based
Your audio files never leave your device. All processing runs locally in your browser using WebAssembly and TensorFlow.js. No server uploads, no data collection.
7 Audio File Formats
Accepts MP3, MP4, WAV, M4A, FLAC, AAC, and AIFF as input. Upload the file from your device and get a standard MIDI file as output.
Free, No Limits
No account required, no file count limits, no watermarks. Run as many conversions as you need, completely free.
Pitch Bend Detection
The AI model picks up pitch bends and note onsets with high accuracy, so subtle musical expressions in your audio file are not lost.
Instant Download
Get your MIDI file straight after the conversion finishes. No email required, no waiting queues. Click convert, then download.
Audio Preview
Listen to your file before running the conversion. The built-in player with waveform visualization helps you confirm you have the right take loaded.
Works on Any Device
Use it on desktop, tablet, or phone. No software to install. Any modern browser with JavaScript enabled is all you need.
How It Works
Convert an audio file you already have on your device in four steps
1. Upload Your Audio File
Drag and drop or click to upload from your device. Accepts MP3, MP4, WAV, M4A, FLAC, AAC, and AIFF. If your audio came from an online video, grab it from the source first.
2. Preview & Verify
Listen to the file in the built-in player. Make sure it is the right take before converting.
3. AI Conversion
Click "Convert to MIDI" and let the AI model analyze your audio. The neural network detects notes, timing, and velocity.
4. Download MIDI
Your MIDI file is ready. Download it and use it in any DAW, notation software, or play it online.
Frequently Asked Questions
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Three quick steps:
- Click upload or drag and drop your audio file from your device
- Wait for the file to load and preview it if you want
- Click "Convert to MIDI" and download the .mid file when it is ready
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Yes, this audio to MIDI tool is completely free. No hidden fees, no subscriptions, no usage limits.
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Yes. Your audio file is processed directly in your browser using client-side AI. The file is never uploaded to a server or stored anywhere. Everything happens locally on your device.
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The usage rights of the resulting MIDI depend on the license of the original audio file. If you own the rights to the audio or have permission to use it commercially, the MIDI you generate is fine to use commercially as well.
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Yes. All the MIDI files we publish alongside our sheet music are produced with this same conversion pipeline. You can browse them here: Free MIDI files.
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Yes. We use Google's Magenta.js AI model (Onsets and Frames) to analyze and transcribe the audio. This deep learning model is trained to recognize musical notes and write them out as MIDI data with high accuracy.
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Yes. The AI model is especially good at recognizing piano notes, so the resulting MIDI plays back naturally with any piano sound font or virtual instrument.
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Yes. Upload your MP3 file from your device and the AI will write the music out as MIDI.
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Yes. WAV files are fully supported and often give the cleanest results because they are uncompressed.
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Yes, when the MP4 is a local file on your device. The converter pulls the audio track from your MP4 and ignores the video.
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Yes. M4A files are supported. These Apple-format audio files convert just like any other supported format.
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OGG is not supported yet. Convert your OGG file to MP3 or WAV first, then run it through the converter.
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Yes. The converter detects pitch in vocal takes and writes it out as MIDI notes. For best results, use a clear recording with minimal background noise.
Technical Details
How the AI audio file to MIDI transcription engine works
AI Model
The converter uses Google Magenta's Onsets and Frames model, a convolutional and recurrent neural network trained on the MAESTRO dataset (over 200 hours of virtuosic piano performances with aligned MIDI). The model separately predicts note onsets and active frames, then combines them for accurate pitch and timing detection.
Processing Pipeline
Audio is decoded using the Web Audio API, resampled to 16kHz mono, and turned into a mel spectrogram. The spectrogram feeds into the neural network running via TensorFlow.js in your browser. Output note predictions are quantized and written as a standard MIDI file using the @tonejs/midi library.
Supported Formats
Best Results
- Solo piano recordings produce the most accurate MIDI output
- WAV and FLAC (lossless) give better results than compressed MP3
- Clear recordings with minimal background noise convert best
- Multi-instrument arrangements produce a simplified single-track MIDI