ImgTool.app - Privacy-first music visualizer that runs in your browser
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ImgTool is a privacy-first, browser-based music visualizer for musicians, producers, DJs, and creators. No account required. No audio upload needed. Your music stays on your computer. You can create 1080p visualizer videos in the browser for free, with an optional paid tier for 4K export. There is also a demo track so people can test performance before using their own files.

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Quick update on new updates since launch:
3D model support — reactive 3D scenes alongside the existing 2D styles
Video backgrounds — drop in your own video clips as the backdrop, all processed locally
Built-in video library — a set of ready-to-use background clips so you can build a scene without sourcing your own footage
Still no audio upload to a server, still no account needed. Demo tracks on the site if you want to try it before using your own music.
https://imgtool.app/how-to-use.html