Audio Volume Booster

WHAT IT DOES

Audio Volume Booster increases the volume of HTML5 video and audio elements beyond the browser's normal maximum. While most browsers limit volume to 100%, this tool lets you boost audio up to 200% of normal volume, making quiet videos, podcasts, or lectures clearly audible. A simple slider controls the boost level from 0% to 200%, with the current percentage displayed prominently. Your boost preference is remembered per site, so you don't have to adjust it every time you visit a page. A floating indicator shows the current boost level when active, and you can reset all media to normal volume at any time.

WHERE IT RUNS

The extension runs entirely within your browser's local environment using the BotGentz framework. All volume boosting, audio processing, and settings management occur on your machine without any network requests. No audio data, volume settings, or user activity is ever transmitted, uploaded, or stored externally. The tool works on any website and respects the browser's security boundaries, operating within the isolated extension sandbox. Volume boosting uses the Web Audio API's GainNode for high-quality audio amplification.

HOW TO USE

Click the extension toolbar icon to open the Audio Volume Booster panel. Use the slider to adjust the boost level from 0% to 200%—changes apply instantly to all video and audio elements on the page. The current boost percentage is displayed prominently at the top of the panel. Enter a specific value in the number input field for precise control. Toggle "Remember per site" to save your boost level for each domain. Toggle "Show indicator" to display a floating badge showing the current boost level at the bottom of the screen. Set a "Default boost" for sites without a saved preference. Adjust the "Maximum boost" limit (100-500%) if you need even more volume. Use "Reset All Media" to restore all media elements to normal volume (100%). The tool works automatically—when you visit a site, your saved boost level is applied.

THE VOLUME BOOST ENGINE — WHY IT WORKS

Most volume boost tools simply set the volume property above 1.0, which browsers ignore or clamp. This tool uses the Web Audio API to bypass that limitation. When a media element is detected, the tool creates an AudioContext and uses createMediaElementSource to route the audio through a GainNode. The GainNode's gain value controls the amplification—a gain of 1.0 is normal volume, 2.0 is 200%, and 0.5 is 50%. The gain value is calculated as: gain = 1 + (boostLevel - 100) / 100, where boostLevel is the user's desired percentage. This allows amplification up to 200% (gain = 2.0) or higher if the max boost limit is increased. For browsers that don't support the Web Audio API, the tool falls back to setting the volume property as high as possible. The per-site memory stores boost levels in GM_setValue using the domain as the key, so your preferred level is restored when you return. This Web Audio API approach provides clean, distortion-free volume boosting that works with any HTML5 media element.

THE PANEL

The Audio Volume Booster panel is fully draggable by its title bar and remembers its position on screen per website. It snaps to the edges of your browser window for clean alignment. Collapse the panel to a compact icon strip using the minimize button, restoring it with a single click. Resize the panel by dragging any edge or corner; the boost controls and settings adjust proportionally. Press the Escape key to close the panel instantly. The panel maintains independent state for each browser tab, allowing you to control volume boosting in multiple tabs simultaneously.

PLEASE NOTE

This extension requires the free BotGentz extension framework to be installed and enabled. Boosting volume above 100% may introduce audio distortion, especially at higher levels or with already-loud content. The tool works with HTML5 video and audio elements; embedded players from YouTube, Vimeo, and other platforms are supported. Some websites may use custom audio processing that bypasses the Web Audio API. All volume data is processed locally and is never transmitted, logged, or shared. The extension requests no network permissions and functions entirely offline. The source code is fully auditable and available for review.