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Real-time piano roll
Watch every note appear, light up and fade as it plays — across all instruments and tracks, with precise timeline scrubbing.
or use the Import button in the sidebar
The Browser MIDI Player
Play any .mid file with studio-grade control — right in your browser. Adjust BPM, loop sections for practice, mute and solo individual tracks, and watch every note dance across a real-time piano roll. No download, no upload, no account.
What you get
Watch every note appear, light up and fade as it plays — across all instruments and tracks, with precise timeline scrubbing.
Drag tempo from 30 to 240 BPM without changing pitch. Perfect for practicing a tricky passage at half-speed.
Set a loop region to drill the same 4 bars until your fingers know the part. The single most-used practice feature.
Isolate the bass line, mute the drums, focus on one voice in a fugue. Each track gets its own solo/mute toggle.
Switch between Synth, AM, FM, Duo and Membrane voices to find a sound that fits the piece you're playing.
No account, no plugin, no desktop app. The file is parsed locally with Tone.js the moment you drop it in.
How it works
Drag from Finder/Explorer or click to select. The file is parsed instantly in your browser — file name, duration and track count appear immediately.
Choose a synth voice from the toolbar. Drag BPM and volume to taste. Defaults work fine for most MIDI files.
Hit play. Enable loop to drill a section. Drag the timeline to skip ahead. Solo or mute tracks as you go.
Toggle solo/mute on individual tracks to isolate a melody line, mute a busy drum part, or compare arrangements.
No sound? Click anywhere on the page to unlock AudioContext (a browser security requirement). Still nothing? Try Chrome or Edge desktop.
Who it's for
Music teachers
Halve the BPM so a student can hear every note in a fast Bach invention, then loop the tricky measures until they're learned.
Students & practicers
Mute the right hand and play along to the left, or vice versa. Use looping to repeat 4 bars until it's muscle memory.
Producers & composers
Hear how a stem sounds in isolation. Solo the bass to check note choices. Quickly preview .mid exports from your DAW before committing.
Hobbyists
Got a folder of .mid files from the 90s? Drop them in. No need to install Windows Media Player or hunt down a soundfont — it just works.
How it compares
| Feature | MidiToolbox | Windows MP | VLC | MidiPlayerX |
|---|---|---|---|---|
| Install required | No | Yes (Windows only) | Yes | Yes (macOS only) |
| Piano roll view | Built-in | — | — | Limited |
| BPM / speed control | 30—240 BPM | Fixed | 0.5—2x | Yes |
| Per-track solo & mute | Yes | — | — | Yes |
| Works on iPad / mobile | Yes | No | Limited | No |
| Price | Free | Free | Free | Paid |
Desktop players are great for power users, but a browser-based player wins for quick previews, lessons, and any computer where you can't install software.
Common questions
If something's wrong
Under the hood
Keep going
Render any .mid into MP3 or WAV with a SoundFont. Set bitrate, volume and export — no upload.
Open toolFull-screen piano roll visualization for presentations, lessons or just enjoying a piece.
Open toolInspect tempo, time signature, key, instruments and duration of any MIDI file.
Open toolParsing and playback are 100% local — your MIDI files stay on your device. You're responsible for ensuring you have the right to play, share or redistribute the files you use.