MP3 to MIDI Converter

What is MP3 to MIDI Converter?

MP3 to MIDI Converter is a free online tool that converts audio recordings into downloadable MIDI files. According to the site, a visitor uploads an audio file, selects whether the recording contains solo piano or a full song, and receives a MIDI transcription plus an audio preview. The service is presented as an honest, open experiment: it runs open-source transcription models on the server and states its limits clearly. It supports MP3, WAV, M4A, OGG, and FLAC, up to 30 MB. Each conversion is capped at the first 20 seconds of the uploaded file. No account or payment is required during the test phase. Files and results are kept for about an hour and then deleted automatically. Solo piano works best; full-song transcription is experimental.

How MP3 to MIDI Converter works

The workflow is simple. A user drags and drops an audio file or clicks to browse, then chooses what is in the recording. Piano mode uses a piano-specialized model and is intended for solo piano recordings. Full song mode uses a multi-instrument model that attempts to split the output into separate tracks; the page labels this mode experimental and says instrument detection can be wrong. The result includes a downloadable MIDI file and an audio preview rendered from the exact MIDI that the user downloads. Longer files are trimmed to their first 20 seconds before conversion, and the result page always tells the user when this happens. The site states that nothing is silently cut, although the 20-second cap still applies. Uploads, intermediate files, and results are kept for about an hour, then deleted automatically. Only anonymous usage counts, such as page views, conversions, and downloads, are retained. Each conversion includes a feedback box where users can describe what they used the MIDI for and where it fell short.

Main features

• Real conversion using open-source transcription models on the server.
• Two modes: Piano for solo piano recordings and Full song for multi-instrument mixes.
• Full song mode is experimental, with rough multi-track output.
• Audio preview before download, rendered from the exact MIDI file.
• First 20 seconds converted per upload, with clear disclosure when a file is trimmed.
• Accepts MP3, WAV, M4A, OGG, FLAC, and other common audio formats up to 30 MB.
• Free during the test phase with no sign-up or payment; a daily limit per visitor applies.
• Uploads, intermediate files, and results auto-deleted within about an hour.
• Anonymous usage counts only; audio is not kept.
• Feedback box included with every conversion.
• Built on open-source components: Piano Transcription by ByteDance under CC BY 4.0, YourMT3+ under Apache 2.0, and the GeneralUser GS SoundFont.

Pricing

MP3 to MIDI Converter is free during its test phase. The site states that no account is needed and that there is no payment. A daily limit per visitor applies to keep the service available for everyone. Each conversion is capped at the first 20 seconds, and uploads are limited to 30 MB. The supplied page does not mention paid plans, subscriptions, credits, or other pricing tiers. Because the tool is described as a free early test, users should check the site for future changes to availability or limits.

Common use cases

The clearest use case is transcribing a clean solo piano recording. Piano mode is designed for this and is reported to work best when the recording contains one piano, solo. A user can upload a short performance, preview the transcription, and download MIDI for editing in a DAW or notation program. Another use case is getting a rough MIDI starting point from a full song. The experimental full-song mode attempts multiple instruments, but the output may need manual cleanup and instrument correction. The tool can also be used to quickly test audio-to-MIDI conversion without creating an account or paying. Because each file is limited to the first 20 seconds, it is better suited to short excerpts than to full-length song transcription. The feedback box suggests the tool is also useful for reporting transcription quality and influencing future development.

Limitations

The most important limitation is the 20-second conversion cap. Longer files are trimmed to their first 20 seconds before conversion, and although the result page discloses this, users cannot transcribe a full-length song in one upload. Uploads are limited to 30 MB. Accuracy varies: clean solo-piano recordings transcribe well, but dense mixes, drums, and full songs are much harder. Full-song output is explicitly a rough starting point that needs manual cleanup, not a finished transcription. Instrument detection in full-song mode can be wrong. The tool offers only two modes, piano and full song, and the supplied page does not describe detailed editing, advanced settings, or export options beyond downloading the MIDI. It is free only during the test phase, with a daily limit per visitor and no account system. Files and results are deleted within about an hour, so users must download promptly. Only anonymous usage counts are kept; the site says it never keeps the audio. The product is not a replacement for professional transcription or a full DAW workflow.

Summary

MP3 to MIDI Converter is a free online audio-to-MIDI converter designed for short uploads. It offers a piano-specialized mode for solo piano recordings and an experimental full-song mode for multi-instrument mixes. Every conversion is capped at the first 20 seconds, files are limited to 30 MB, and results are auto-deleted within about an hour. The service requires no sign-up or payment during its test phase but applies a daily limit per visitor. Its strengths are transparent limits, an audio preview rendered from the downloadable MIDI, and open-source transcription models. Its limitations are the short conversion window, variable accuracy, experimental full-song output, and lack of advanced features. It is best treated as a quick, honest test tool for solo piano excerpts or rough multi-instrument starting points, not as a finished full-song transcription service.