MIDI Piano Visualizer

KeyBloom

The moment your playing blooms

Particles bloom from the key you press — file or live.

Free desktop appWindows only · web runs MIDI files
01Live

Particles bloom from the key you press

The instant you touch a key, light rises from that key. A native audio engine bypasses the browser, so it feels like playing — and your take renders straight to video.

6 ms
Measured on ASIO · web is 58 ms
ASIO
Hardware driver picked automatically
MIDI keyboard
Recognized as soon as it's plugged in
02File

Drop in a MIDI, get a video

88 keys press in time with the file and particles bloom from each one. Rendered frame by frame, so nothing drops on a slower machine.

01
Open MIDI
02
Pick the visuals
03
Save the video
MP4 · 1080p · offline render
KeyBloom app — stage, sequencer and visual panel
03Effect

Seven motions, five color modes

Shape (●■♥★), color, count, size, speed, height and glow — set once as a global rule for the whole piece. No note-by-note keyframing.

Bloom
Radial Bloom
Rise & Scatter
Spiral
Fireworks
Fountain
Sand Drift
Color mode
Solid
Min–Max gradient
Pastel
Rainbow
Palette
04Cue

A different look per section

Build up to six cues and drop them on the timeline — the visuals change from that point on, while particles already in the air keep their old color.

1 Intro
2 Verse
3 Chorus
✏️ Pen
🧲 Snap
+

MIDI · audio waveform · visual track — on one screen

05Watch

Made with KeyBloom

Performance and demo videos from the official channel.

Open the playlist on YouTube
06Export

No watermark, alpha included

MIDI files in the browser, live playing in the app. PLUS opens the output. Windows only.

Feature
Free web
Free app
Windows
PLUS
Web + app
MIDI file → video · seven motions
Built-in piano — sound without an audio file
Low-latency live play (ASIO)
1080p MP4 export
Watermark
Yes
Yes
None
1080p transparent background — PNG sequence · ProRes-compatible .mov · app only
Background image · custom shapes · output window · app only
In-app ads
Yes
Yes
None
A transparent background your editor reads as is
PNG sequence or a single file — alpha lands intact on your timeline

Get KeyBloom

The web and desktop app are free. PLUS is a one-time purchase — after checkout you receive a license key by email; paste it into the KeyBloom app to unlock.

PLUS — coming soonFree app — coming soonOpen web demo