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Neon Audio · Free Tool

Reactive Visualizer

Your track is finished. The video for it isn't — and every visualizer worth using either costs money or stamps a watermark on your upload.

Point it at any audio — your mic, a music file, or a browser tab — and watch it move. Retro screensaver energy, fully customizable, fullscreen. Free, nothing uploads.

01 Give it sound Mic, a music file, or a browser tab. Nothing uploads — it all runs in this page.
02 Pick a look Choose a mode and a colour palette below. 🎲 Surprise me rolls a whole new one.
03 Then tweak, or don't Everything under the drawers is optional — layers, auto-shuffle, fine tuning, video export.
▶ Pick an audio source below
Use your microphone, drop in a track, or share a browser tab's sound. The visuals react in real time.

Tired of the watermark? Hand over your email and the Neon sun comes off for good on this browser — plus the 12-sound DreadScape sampler, royalty-free and yours to ship.

Pick a look

Start here — everything else is optional.

Colors

Beat flash (bass-reactive pulse)
Cycle through palettes
Palette change
5s
Change every
Drag up or down · scroll · arrow keys
Layers, shuffle & mirroring stack visuals, let them change, fold the frame

Stack extra visuals

Layer strength60%

Auto-shuffle let the stack change on its own

Change the look on its own
Switch every8s

Shuffle between these

How many shuffled at once1

Anything ticked in Stack extra visuals above stays put and is never shuffled — tick Matrix and it stays while these rotate underneath it.

Mirror

Fine tuning sensitivity, glow, trails
Sensitivity1.0×
Smoothing0.80
Trailsmed
Glowmed
Detail96
Motion0.20
⚙ Advanced — output size, export, MIDI
Output frame — lock the shape you're posting to
AspectWindow
Render size1080
Make a video
Output frame—
to
Audio in video
Load a music file to export.

The Neon Audio sun fades in and out over the visuals. Unlocking with your email removes it.

Branding — burned into the recording
Title
Subtitle
Corner
Reactivity — how the audio drives the picture
Auto-gain (quiet tracks still react)
Bass drivesScale
Mids driveSpin
Highs driveGlow
Modulation depth0.50
Performance / live
Change look on the BEAT, not a timer
Auto-quality (drops detail if FPS sags)
MIDI controller — CC 1-8 drive the sliders
—
Help & troubleshooting nothing moving? start here
Nothing is reacting
The visuals only move while audio is actually playing. Check the source is running, and that you picked one of the three buttons above — the canvas sits idle until you do.
“Tab / system audio” shared nothing
In the picker you must choose a tab and tick “Share tab audio”. Without that tick the browser hands over video only and there is nothing to visualize. This path needs a Chromium browser — Chrome, Edge or Brave.
The mic is hearing my speakers
That's deliberate. Echo cancellation, noise suppression and auto-gain are all switched off so the visualizer sees the real signal, not a cleaned-up phone-call version of it. Playing a track out loud into the mic is a perfectly good way to drive it.
Record live vs Export MP4 — which one?
⏺ Record live captures in realtime, exactly what you see, from any source (Chromium only). ⬇ Export MP4 in the Advanced drawer renders frame by frame for a clean, frame-exact file — it needs a music file loaded, and is unlocked with your email.
Using it in OBS
⧉ Pop out window opens a bare full-bleed canvas with no controls on it. Add that window in OBS as a Window Capture. Keep this tab open — the controls here keep driving the popped-out window live.
A quiet track barely moves
Auto-gain is on by default and should catch it. If it still feels flat, raise Sensitivity under Fine tuning.
Free download12 or 15 WAVs

Free sounds to visualize

Creature vocals, impacts, drones, stingers and UI, hand-picked from DreadScape. Same masters as the paid pack, no watermarks. Drop one into the player above, or straight into a game.

44.1 kHz · 16-bit WAV · royalty-free · commercial use permitted

One email with your download link. No spam, no list-selling. Privacy.

From the studioNeon Audio

This tool is free because the packs pay for it.

Neon Audio is one person in Las Vegas making royalty-free game audio by hand. No AI in the audio, ever. If the tools are useful to you, the libraries are how they keep getting built.

DreadScape — Horror Sounds & Ambience

Every layer of a scare in one curated pack: creature vocals, impacts, drones & ambience, dark stingers, UI.

62 sounds · 5 categories · $4.99 Get it on itch →

Sci-Fi Core

The starter kit for a sci-fi game's audio — alien and robot creatures, metallic footsteps, lasers, loops, interface.

58 sounds · 6 categories · name your price Download free on itch →

Custom sound design

Need something that doesn't exist yet? Creatures, weapons, UI, ambience — built from scratch for your project.

Commissions open · games · film · TV Start a project →

Not ready to buy? Get 12 free sounds by email — hand-picked from DreadScape, same masters, cleared for commercial use.

QuestionsNeon Audio
Can I use the output in a video I publish or monetise?

Yes. There is no watermark and no licence attached to what you render — the visuals are yours to publish, monetise or hand to a client. The music you run through it is your own responsibility, as always.

Does my audio get uploaded anywhere?

No. The microphone, file and tab audio are all analysed in your browser and nothing is transmitted. There is no upload step and no server-side rendering, which is also why it keeps working if your connection drops.

How do I use it in OBS?

Click the pop-out button to open the visuals in their own clean window with no controls, then add a Window Capture source in OBS pointed at it. The pop-out is deliberately not gated — it is the same URL, so a lock there would be theatre.

Can I export a video file?

Yes, as MP4. Export unlocks with your email address and needs a Chromium-based browser such as Chrome or Edge, because it encodes with WebCodecs. Frames are rendered one at a time rather than screen-recorded, so the file is not affected by your machine stuttering.