There are dozens of free MIDI converters out there. Most of them are garbage — either they use outdated algorithms, require file upload to sketchy servers, or produce MIDI output that's barely usable.
We tested every free tool we could find and narrowed it down to five that actually work. Whether you need to convert MP3 to MIDI, WAV to MIDI, or any other format, here's how they compare. Here's how they compare.
Quick Picks
- Best overall: MP3toMIDI — free, no upload, piano roll preview, multi-format
- Best for notation: MuseScore — free desktop app with sheet music export
- Best for quick one-offs: Basic Pitch — Spotify's web tool, simple interface
Comparison Table
| Tool | Price | Privacy | Formats | Preview | Accuracy |
|---|---|---|---|---|---|
| MP3toMIDI | Free | Local (no upload) | 9 formats | Piano roll | 95-98% |
| Basic Pitch | Free | Upload required | MP3, WAV, OGG | None | 95-98% |
| MuseScore | Free | Local (desktop) | MP3, WAV | Sheet music | 85-92% |
| Klangio | Free / $5 mo | Upload required | MP3, WAV | Yes | 90-95% |
| MidiCo | Free trial | Local (desktop) | MP3, WAV | Yes | 88-93% |
Detailed Reviews
1. MP3toMIDI — Best Overall
MP3toMIDI is the only free tool that checks every box: no file upload, piano roll preview, multi-format support, and solid accuracy. It uses Spotify's Basic Pitch model (the same engine that powers Basic Pitch's web tool) but wraps it in a better experience.
The piano roll preview is the killer feature. You see every detected note before you download, so you know immediately if the transcription is usable. With other free tools, you download a MIDI file, open it in a DAW, and only then discover it's garbage.
Format support is also better than competitors: MP3, WAV, FLAC, OGG, M4A, AAC, AIFF, WMA, and Opus. If you record in lossless formats, you don't need to convert to MP3 first.
Pros: Free, no upload, piano roll preview, 9 audio formats, fast (~12s)
Cons: Large files can be slow on older devices (processing is local)
2. Basic Pitch — Best for Simplicity
Spotify's Basic Pitch is the AI that made browser-based MIDI conversion mainstream. The web interface is dead simple: upload a file, wait, download. It supports MP3, WAV, and OGG.
The main limitation is that you upload your file to Spotify's servers. For unreleased music, that's a privacy concern. There's also no preview — you download the MIDI blind and hope it's good.
Pros: Free, clean interface, backed by Spotify's research
Cons: Requires upload, no preview, limited format support
3. MuseScore — Best for Sheet Music
MuseScore 4 added audio-to-notation conversion. If your end goal is printed sheet music rather than a MIDI file, this is the best free option. The transcription accuracy is lower than dedicated tools, but you can edit the notation directly in MuseScore's excellent score editor.
Pros: Free, open source, direct notation editing, PDF export
Cons: Slower, lower accuracy, desktop only, limited formats
4. Klangio — Best for Instrument-Specific
Klangio's differentiator is instrument-specific models. Tell it you're converting a piano piece, and it optimizes for piano frequencies. This helps with accuracy, especially for bass-heavy or treble-heavy instruments.
The free tier limits you to 30-second clips. That's enough for a chorus or verse, but not a full song. The paid plan ($5/month) removes this limit.
Pros: Instrument-specific models, web-based, easy to use
Cons: 30-second limit (free), requires upload, subscription pricing
5. MidiCo — Best for Karaoke Users
MidiCo is a desktop app aimed at karaoke enthusiasts. It converts audio to MIDI and can also do the reverse — separate vocals from instrumentals. The MIDI conversion is decent but not as accurate as browser-based AI tools.
Pros: Desktop app, vocal separation, karaoke features
Cons: Free trial limited, Windows only, older AI model
Which One Should You Choose?
- Just need a quick MIDI file? Use MP3toMIDI. Free, fast, preview before download.
- Converting a piano recording? Try MP3toMIDI's piano extraction — optimized for keyboard instruments.
- Have a WAV file? MP3toMIDI's WAV converter handles lossless formats directly.
- Working with any audio format? MP3toMIDI supports 9 formats including FLAC, OGG, M4A.
- No installation possible? MP3toMIDI or Basic Pitch — both run in your browser.
For most people, MP3toMIDI is the right starting point. Try it on one song — if the results aren't good enough, then explore the other options.
Try the Best Free MIDI Converter
No signup, no upload, no file size limit. Convert your audio in seconds.
Convert Audio to MIDI →Frequently Asked Questions
What is the best free MIDI converter in 2026?
MP3toMIDI is the best free option for most people. It runs in your browser with no file upload, supports 9 audio formats, includes a piano roll preview, and uses the same AI model as Spotify's Basic Pitch. For desktop users who need sheet music output, MuseScore is a solid alternative.
Are free MIDI converters accurate enough?
For single-instrument recordings, yes — free tools achieve 93-98% note accuracy. For complex multi-instrument mixes, you'll need manual cleanup regardless of which tool you use. Paid tools like Melodyne ($99+) only really matter if you need to extract one instrument from a dense mix.
Do I need to install software to convert MIDI?
No. MP3toMIDI and Basic Pitch are browser-based — no installation needed. MuseScore and AnthemScore require desktop installation but are free or affordable.
Is it safe to use online MIDI converters?
It depends on the tool. Server-based converters (like Basic Pitch) upload your file to their servers, which is a privacy concern for unreleased music. Browser-based tools (like MP3toMIDI) process everything locally — your file never leaves your device.
Can I convert MIDI back to MP3?
Yes. MP3toMIDI has a MIDI to MP3 converter that renders your MIDI file to audio. You can also use any DAW to play MIDI through a virtual instrument and export the audio.