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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.
Drop MIDI file here
or use the Import button in the sidebar
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BPM
The Browser MIDI Player
Free Online MIDI Player — Speed, Loop, BPM Controls
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
Everything a real MIDI player should do
02
BPM & speed control
Drag tempo from 30 to 240 BPM without changing pitch. Perfect for practicing a tricky passage at half-speed.
03
A-B section looping
Set a loop region to drill the same 4 bars until your fingers know the part. The single most-used practice feature.
04
Per-track solo & mute
Isolate the bass line, mute the drums, focus on one voice in a fugue. Each track gets its own solo/mute toggle.
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Multiple synth voices
Switch between Synth, AM, FM, Duo and Membrane voices to find a sound that fits the piece you're playing.
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Zero upload, zero install
No account, no plugin, no desktop app. The file is parsed locally with Tone.js the moment you drop it in.
How it works
From file to playback in under 5 seconds
- 01
Drop a .mid file
Drag from Finder/Explorer or click to select. The file is parsed instantly in your browser — file name, duration and track count appear immediately.
- 02
Pick a voice, set BPM
Choose a synth voice from the toolbar. Drag BPM and volume to taste. Defaults work fine for most MIDI files.
- 03
Play, loop, scrub
Hit play. Enable loop to drill a section. Drag the timeline to skip ahead. Solo or mute tracks as you go.
- 04
Focus tracks
Toggle solo/mute on individual tracks to isolate a melody line, mute a busy drum part, or compare arrangements.
- 05
Troubleshoot
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
Built for four kinds of MIDI work
Music teachers
Slow down for lessons
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
Drill any passage
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
Audition arrangements
Hear how a stem sounds in isolation. Solo the bass to check note choices. Quickly preview .mid exports from your DAW before committing.
Hobbyists
Play your old MIDI library
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
MidiToolbox vs desktop MIDI players
| 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
Things people ask before they play
If something's wrong
Troubleshooting cheatsheet
- No sound at all
- Click anywhere on the page first. Browsers require a user gesture before audio can play (AudioContext lock). If still silent, check your system volume and that the page isn't muted in the tab.
- Playback is choppy or laggy
- Close other tabs using audio or heavy CPU. Try a smaller synth voice (Synth or Duo instead of FM). Very large MIDI files with hundreds of simultaneous notes may stress lower-end devices.
- Wrong instrument sounds
- This player uses generic synth voices, not General MIDI patches. To hear the original instrument intent (piano, strings, etc.), export with the Converter using a SoundFont, or use the Visualizer for a sound-agnostic preview.
- Doesn't work on my phone
- iOS Safari has stricter audio rules — tap play after a manual interaction. Some Android browsers limit polyphony. If you're stuck, try the desktop or iPad version of Chrome/Safari.
Under the hood
Technical specs
- Audio engine
- Tone.js + Web Audio API
- MIDI parser
- @tonejs/midi
- Supported files
- .mid, .midi (Type 0 & Type 1)
- BPM range
- 30 — 240
- Volume range
- -60 to 0 dB
- Processing
- 100% local, no upload
Keep going
Related MIDI tools
MIDI Converter
Render any .mid into MP3 or WAV with a SoundFont. Set bitrate, volume and export — no upload.
Open toolMIDI Visualizer
Full-screen piano roll visualization for presentations, lessons or just enjoying a piece.
Open toolMIDI Analyzer
Inspect tempo, time signature, key, instruments and duration of any MIDI file.
Open toolPrivacy & licensing
Parsing 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.