Music Visualizer is a browser-based application designed to create audio-reactive videos. Its primary function is to let users generate synchronized visual content from audio tracks and artwork without requiring a dedicated video editor. Users can add audio, cover art, logos, titles, and color schemes, then preview the result live before exporting. The application processes real-time frequency analysis so that visual elements such as bars, pulses, and gradients respond to beats and frequencies in the audio. The tool includes several production-oriented features. Users can choose from preset visual styles and customize composition, background cropping, pan and zoom, color, text, and visual intensity. It supports square, vertical (9:16), and landscape formats, and adapts its preview to desktop and mobile browsers. Editing and previewing take place entirely in the local browser, meaning audio and image files are not uploaded until the user chooses to export. Rendering is performed asynchronously through cloud servers, producing H.264 video at up to 60 frames per second. Finished videos remain available for download for 14 days. The service does not require a subscription, but export credits are used to process final videos. The typical workflow involves selecting a preset, adding media such as audio and artwork, adjusting text, ratio, color, and intensity, and then previewing before export. Once satisfied, the user signs in, uses an export credit, and receives a share-ready video file. This makes the application suitable for musicians preparing release promos, DJs creating visuals for mixes, and podcasters producing episode artwork animations. In each case, the goal is to give audio a consistent visual identity using the user’s own artwork, logo, and branding.