How to score a video with a MIDI keyboard in your browser

This guide shows how to add original music to a video by playing it live. You need a computer with Chrome or Edge, a video file, and a MIDI keyboard (your computer keyboard works too).

1. Open MidiMovie and create a project
   Open the app and press "New project". Everything is saved automatically in your browser.
2. Load your video
   Drop a video file onto the stage. It stays on your device and is never uploaded.
3. Connect your MIDI keyboard
   Press "Connect MIDI" and allow access in the browser. No keyboard? Turn on the computer keyboard (A–K keys) or use the on-screen keys.
4. Choose a sound
   Pick a preset in Simple mode, or build your own in Pro mode. Pro also adds a sampler for your own recordings.
5. Record a take
   Press the red button and play along to the picture. Use slow playback (¾, ½, ¼) for fast passages and add markers at key moments.
6. Layer and edit
   Keep the take, then record more layers on top. Fix notes in the piano roll: move, resize, transpose or change velocity.
7. Export
   Export the mix as WAV or the notes as a MIDI file for free. Export the finished video with your music as MP4 with Pro.

Open the app

FAQ

Do I need to install anything?

No. MidiMovie runs in the browser. Chrome or Edge is recommended because of their MIDI support.

Is it free?

Yes for recording, editing, and WAV and MIDI export with up to 2 layers. Pro is a one-time purchase that unlocks the sampler, audio → MIDI, MP4 export, stems and unlimited layers.

Are my videos uploaded anywhere?

No. Videos and projects stay in your browser on your device.

Which MIDI keyboards work?

Any class-compliant USB MIDI keyboard that your browser can see. You can also play with the computer keyboard.