Free tool

A free audio visualizer overlay for OBS

Most "free" stream visualizers either watermark the output, make you sign up, or render in someone's cloud and email you a file. This one runs in your browser tab, has a dedicated pop-out window built for window capture, and does none of those things.

Setting it up in OBS

1. Open the visualizer and pick your audio source — your microphone, an audio file, or a browser tab.
2. Set the output frame in the Advanced drawer. Choose an aspect (16:9, 9:16, 1:1 or 4:5) and a resolution (720p, 1080p or 1440p). The canvas is then sized to those exact pixels rather than to your window, so what OBS captures is the shape you actually want.
3. Pop it out. The pop-out opens the visuals in their own bare window with no page chrome around them.
4. In OBS, add a Window Capture source and select that pop-out window. Crop if you need to, and you're done.

Capturing the pop-out rather than the whole browser is what keeps the toolbar, tabs and bookmarks out of your scene. If you'd rather not pop out, Window Capture on the browser plus a crop filter works too — it's just more fiddling every time you restart.

Getting audio into it

• Tab audio — share a browser tab and it reacts to whatever is playing in it. Easiest route for music from a streaming service or YouTube.
• Microphone — reacts to a live input.
• An audio file — drop one in and it plays and reacts.

Auto-gain is available so a quiet source still drives the visuals properly instead of producing a flat line. It normalises toward a consistent level with a fast attack and slow decay, so it doesn't pump on transients.

What it actually does

• Six visual modes and 16 colour palettes.
• Band-to-parameter modulation — map bass, mids or highs onto scale, spin, glow or trail, with one depth control.
• Beat sync — change looks every N detected beats instead of on a wall-clock timer that slowly drifts against the track.
• Burned-in title and subtitle with a corner tag, drawn last so it survives into any recording.
• Web MIDI — CC 1–8 map to sensitivity, smoothing, trail, glow, detail, spin, blend and depth, so you can perform it from a controller.
• Auto-quality — if the frame rate drops it reduces detail on its own, with a live fps and resolution readout.
• Shareable looks — the whole parameter set encodes into the URL, so a link reopens with your exact setup.

Recording without OBS

If all you want is a clip, you don't need OBS at all. The tool records the canvas directly, with the source audio muxed in, and hands you a video file. There is also a deterministic MP4 export for a clean render.

Being straight with you about the one catch: recording is free to use, but saving the resulting file — and the MP4 export — requires unlocking the tool with an email address. Everything else on this page, including the pop-out and OBS capture, works with no email and no account. If you're going the OBS route, the gate never comes up.

Requirements

• A current desktop browser. Tab-audio capture is a desktop feature — it is not available on iOS Safari, so this is a desktop tool.
• The MP4 export path uses WebCodecs and is Chromium-only; you'll get a clear message rather than a silent failure in other browsers.
• Nothing is uploaded. All processing is local to your machine — the server only ever sends you the page.

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