Free Online MIDI Editor - Edit, Quantize & Remix in Browser
The easiest way to edit MIDI files online. No software installation required. Features a professional piano roll, smart quantization, and velocity control.
Features
Experience a professional-grade MIDI editing suite directly in your browser with advanced tools and seamless export.
Professional Piano Roll
Visualize and modify notes on a precise grid. Drag to change pitch and duration effortlessly.
Smart Quantization
Automatically fix timing errors. Snap notes to the beat to perfect your rhythm instantly.
Velocity & Dynamics
Adjust note velocity to humanize your music. Make it sound expressive, not robotic.
Change Key & Tempo
Quickly transpose your entire track to a different key or adjust the BPM (tempo).
Multi-Track Editing
Solo, mute, or edit specific instrument tracks. Full control over your arrangement.
Instant MIDI Export
Download your work as a standard .MID file. Compatible with Ableton, FL Studio, and Logic Pro.
How to Use
Follow these three simple steps to start editing your music today.
Import Your MIDI
Drag and drop any .mid or .kar file. The editor loads instantly without uploading to a server.
Edit Notes & Tools
Use the pencil tool to add notes, or select notes to quantize and transpose.
Save & Download
Click export to save your edited file locally. No watermarks, completely free.
FAQ
Technical Specs
Supported Formats
Standard MIDI File (.mid), Karaoke (.kar)
Export Format
Type 0 and Type 1 MIDI
Polyphony
Unlimited
System Requirements
Modern Browser (Chrome/Edge/Firefox) with WebAudio API
Related Tools
Privacy & Copyright
Editing runs locally in your browser. Ensure you own rights to your files.