Free online MIDI visualizer
midee is a free online MIDI visualizer that turns .mid files into a falling-note piano-roll performance in your browser. Drop in a MIDI file, press play, and watch the notes move across a full 88-key keyboard with color, glow, particles, and synced audio.
It is useful when you want to understand an arrangement, preview a downloaded MIDI, make a quick visual performance, or export a clean video without installing a native app.
What is a MIDI visualizer?
A MIDI visualizer reads the note data inside a MIDI file and turns it into graphics. Instead of only hearing the song, you can see when notes start, how long they last, which pitches are used, and how different tracks interact.
The most familiar style is the falling-notes piano roll: notes descend toward a keyboard, light up as they play, and make the structure of the music visible.
Quick steps
- Open midee.app.
- Drop in a
.midor.midifile. - Press play to start the visualizer.
- Use the theme, instrument, particle, and track controls to tune the look.
- Export an MP4 if you want to share the visualization.
If you only want to listen, use midee as an online MIDI player. If you want a video file, use the MIDI to MP4 guide.
Why visualization helps
MIDI files often contain more information than your ear catches on the first listen. A visualizer makes that information easier to read:
- Long notes become visible instead of disappearing into the mix.
- Dense chords show their exact shape.
- Repeated patterns become obvious.
- Separate tracks can be recognized by color.
- Mistakes in exported MIDIs are easier to spot.
- Piano learners can see hand movement and note timing.
That makes a MIDI visualizer useful for musicians, teachers, students, composers, remixers, and people who simply enjoy watching music move.
MIDI visualizer features
| Feature | Why it matters |
|---|---|
| Full piano-roll view | See pitch and timing together |
| 88-key keyboard | Understand where notes land on the instrument |
| Track colors | Separate parts in multi-track MIDI files |
| Themes | Match the mood of the piece |
| Instrument choices | Make playback sound less like a generic system MIDI player |
| Particles and glow | Make videos feel alive without editing |
| MP4 export | Share the visualization as a normal video |
| Client-side playback | Keep your MIDI on your own device |
MIDI visualizer vs MIDI player
A MIDI player answers: "What does this file sound like?"
A MIDI visualizer answers: "What is happening in this file?"
Most people need both. That is why midee combines playback and visualization in the same browser app. You can leave a MIDI playing in the background, study the piano roll when something catches your ear, and export the result when it is worth sharing.
MIDI visualizer vs piano learning app
Tools like Synthesia are built around learning and practice. They are great when you want a mature native lesson workflow, mobile apps, and a built-in song library.
midee overlaps with that world, but its center of gravity is different: instant browser MIDI playback, live MIDI input, Learn mode, looping, and sharing.
| Need | Better fit |
|---|---|
| Mature native lesson workflow | Synthesia |
| Browser-based wait-mode practice from your own MIDI | midee |
| Sight-reading and interval practice in the same app | midee |
| Watch a MIDI immediately in the browser | midee |
| Export a clean MP4 without a watermark | midee |
| Make polished classroom lesson material | SeeMusic or a dedicated teaching app |
| Preview a downloaded MIDI file | midee |
For a deeper comparison, read midee vs Synthesia and midee vs SeeMusic.
Common questions
Can I visualize MIDI files online?
Yes. midee visualizes standard .mid and .midi files in the browser.
Does the visualizer upload my MIDI? No. The MIDI is parsed locally by your browser.
Can I export the visualization as a video? Yes. midee can export the piano-roll visualization as an MP4 with audio.
Is midee a Synthesia clone? No. midee has a Synthesia-style falling-note view and wait-mode play-along, but it is broader: browser playback, Learn mode, live play, looping, recording, and MP4 export.
Does it work with multi-track MIDI files? Yes. midee handles multi-track MIDI files and gives tracks separate colors.
Can I use it for live MIDI input? Yes. You can plug in a Web MIDI-compatible keyboard and play live in the browser.
Try it
Open midee, drop in a MIDI file, and watch the piano roll. It is free, open source, browser-based, and private by default.
Try midee
Free, open source, runs in your browser. Drop a MIDI, watch it sing.
Open the app →